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IS43R16800A1
8Meg x 16 128-MBIT DDR SDRAM
FEATURES
ISSI
DEVICE OVERVIEW
(R)
PRELIMINARY INFORMATION APRIL 2006
* * * * * * * * * * * * * * * * * *
Clock Frequency: 200, 166 MHz Power supply (VDD and VDDQ): 2.6V SSTL 2 interface Four internal banks to hide row Pre-charge and Active operations Commands and addresses register on positive clock edges (CK) Bi-directional Data Strobe signal for data capture Differential clock inputs (CK and CK) for two data accesses per clock cycle Data Mask feature for Writes supported DLL aligns data I/O and Data Strobe transitions with clock inputs Programmable burst length for Read and Write operations Programmable CAS Latency (2.5, 3 clocks) Programmable burst sequence: sequential or interleaved Burst concatenation and truncation supported for maximum data throughput Auto Pre-charge option for each Read or Write burst 4096 refresh cycles every 64ms Auto Refresh and Self Refresh Modes Pre-charge Power Down and Active Power Down Modes Lead-free Availability
ISSI's 128-Mbit DDR SDRAM achieves high-speed data transfer using pipeline architecture and two data word accesses per clock cycle. The 134,217,728-bit memory array is internally organized as four banks of 32M-bit to allow concurrent operations. The pipeline allows Read and Write burst accesses to be virtually continuous, with the option to concatenate or truncate the bursts. The programmable features of burst length, burst sequence and CAS latency enable further advantages. The device is available in 16-bit data word size. Input data is registered on the I/O pins on both edges of Data Strobe signal(s), while output data is referenced to both edges of Data Strobe and both edges of CK. Commands are registered on the positive edges of CK. Auto Refresh, Active Power Down, and Pre-charge Power Down modes are enabled by using clock enable (CKE) and other inputs in an industry-standard sequence. All input and output voltage levels are compatible with SSTL 2.
IS43R16800A1 1M x16x8 Banks VDD: 2.6V VDDQ: 2.6V 66-pin TSOP-II
KEY TIMING PARAMETERS
Parameter Clock Cycle Time CAS Latency = 3 CAS Latency = 2.5 CAS Latency = 2 Clock Frequency CAS Latency = 3 CAS Latency = 2.5 CAS Latency = 2 -5 DDR400 5 6 -- 200 166 -- ns ns ns MHz MHz MHz Unit
Copyright (c) 2006 Integrated Silicon Solution, Inc. All rights reserved. ISSI reserves the right to make changes to this specification and its products at any time without notice. ISSI assumes no liability arising out of the application or use of any information, products or services described herein. Customers are advised to obtain the latest version of this device specification before relying on any published information and before placing orders for products.
Integrated Silicon Solution, Inc. -- 1-800-379-4774
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1
IS43R16800A1
FUNCTIONAL BLOCK DIAGRAM (X16)
CK CK CKE CS RAS CAS WE
COMMAND DECODER & CLOCK GENERATOR MODE REGISTER REFRESH CONTROLLER
ISSI
LDM, UDM
DATA IN BUFFER
16 16 2 2
(R)
I/O 0-15 UDQS, LDQS
SELF
A11
A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 BA0 BA1
14
REFRESH CONTROLLER
DATA OUT BUFFER
16 16
VDD/VDDQ Vss/VssQ
REFRESH COUNTER
2 4096 4096 4096 4096
12
ROW DECODER
MULTIPLEXER
MEMORY CELL ARRAY
12
14
ROW ADDRESS LATCH
12
12
ROW ADDRESS BUFFER
BANK 0
SENSE AMP I/O GATE
COLUMN ADDRESS LATCH
9
512 (x16)
BANK CONTROL LOGIC
BURST COUNTER
COLUMN DECODER
COLUMN ADDRESS BUFFER
9
2
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IS43R16800A1
PIN CONFIGURATIONS
66 pin TSOP - Type II for x16
VDD DQ0 VDDQ DQ1 DQ2 VSSQ DQ3 DQ4 VDDQ DQ5 DQ6 VSSQ DQ7 NC VDDQ LDQS NC VDD DNU LDM WE CAS RAS CS NC BA0 BA1 A10 A0 A1 A2 A3 VDD 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 VSS DQ15 VSSQ DQ14 DQ13 VDDQ DQ12 DQ11 VSSQ DQ10 DQ9 VDDQ DQ8 NC VSSQ UDQS NC VREF VSS UDM CK CK CKE NC NC A11 A9 A8 A7 A6 A5 A4 VSS
ISSI
(R)
PIN DESCRIPTIONS
A0-A11 A0-A8 BA0, BA1 DQ0 to DQ15 CK CKE CS RAS CAS Row Address Input Column Address Input Bank Select Address Data I/O System Clock Input Clock Enable Chip Select Row Address Strobe Command Column Address Strobe Command WE LDM, UDM LDQS, UDQS VDD Vss VDDQ VssQ DNU NC Write Enable x16 Input/Output Mask Data Strobe Power Ground Power Supply for I/O Pin Ground for I/O Pin Do Not Use No Connection 3
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IS43R16800A1
PIN FUNCTIONS
Symbol A0-A11 Type Input Pin
ISSI
(R)
BA0, BA1
Input Pin
CAS CKE
Input Pin Input Pin
CK, CK
Input Pin
CS
Input Pin
LDM, UDM
Input Pin
LDQS, UDQS
Input/Output Pin
DQ0-DQ15
Input/Output Pin
NC RAS WE VDDQ VDD VREF VSSQ VSS 4
-- Input Pin Input Pin Power Power Power Power Power Supply Supply Supply Supply Supply Pin Pin Pin Pin Pin
Function (In Detail) Address inputs are sampled during several commands. During an Active command, A0-A11 select a row to open. During a Read or Write command, A0-A8 select a starting column for a burst. During a Pre-charge command, A10 determines whether all banks are to be pre-charged, or a single bank. During a Load Mode Register command, the address inputs select an operating mode. Bank Address inputs are used to select a bank during Active, Pre-charge, Read, or Write commands. During a Load Mode Register command, BA0 and BA1 are used to select between the Base or Extended Mode Register CAS is Column Access Strobe, which is an input to the device command along with RAS and WE. See "Command Truth Table" for details. Clock Enable: CKE High activates and CKE Low de-activates internal clock signals and input/output buffers. When CKE goes Low, it can allow Self Refresh, Pre-charge Power Down, and Active Power Down. CKE must be High during entire Read and Write accesses. Input buffers except CK, CK, and CKE are disabled during Power Down. CKE uses an SSTL 2 input, but will detect a LVCMOS Low level after VDD is applied. All address and command inputs are sampled on the rising edge of the clock input CK and the falling edge of the differential clock input CK. Output data is referenced from the crossings of CK and CK. The Chip Select input enables the Command Decoding block of the device. When CS is disabled, a NOP occurs. See "Command Truth Table" for details. Multiple DDR SDRAM devices can be managed with CS. These are the Data Mask inputs. During a Write operation, the Data Mask input allows masking of the data bus. DM is sampled on each edge of DQS. There are two Data Mask input pins for the x16 DDR SDRAM. Each input applies to DQ0-DQ7, or DQ8-DQ15. These are the Data Strobe inputs. The Data Strobe is used for data capture. During a Read operation, the DQS output signal from the device is edgealigned with valid data on the data bus. During a Write operation, the DQS input should be issued to the DDR SDRAM device when the input values on DQ inputs are stable. There are two Data Strobe pins for the x16 DDR SDRAM. Each of the two Data Strobe pins applies to DQ0-DQ7, or DQ8DQ15. The pins DQ0 to DQ15 represent the data bus. For Write operations, the data bus is sampled on Data Strobe. For Read operations, the data bus is sampled on the crossings of CK and CK. No Connect: This pin should be left floating. These pins could be used for 256Mbit or higher density DDR SDRAM. RAS is Row Access Strobe, which is an input to the device command along with CAS and WE. See "Command Truth Table" for details. WE is Write Enable, which is an input to the device command along with RAS and CAS. See "Command Truth Table" for details. VDDQ is the output buffer power supply. VDD is the device power supply. VREF is the reference voltage for SSTL 2. VSSQ is the output buffer ground. VSS is the device ground.
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IS43R16800A1
Functional Description
ISSI
(R)
The 128Mb DDR SDRAM is a high-speed CMOS, dynamic random-access memory containing 134,217,728 bits. The 128Mb DDR SDRAM is internally configured as a quad-bank DRAM. The 128Mb DDR SDRAM uses a double-data-rate architecture to achieve high-speed operation. The double-data-rate architecture is essentially a 2n prefetch architecture, with an interface designed to transfer two data words per clock cycle at the I/O pins. A single read or write access for the 128Mb DDR SDRAM consists of a single 2n-bit wide, one clock cycle data transfer at the internal DRAM core and two corresponding n-bit wide, one-half clock cycle data transfers at the I/O pins. Read and write accesses to the DDR SDRAM are burst oriented; accesses start at a selected location and continue for a programmed number of locations in a programmed sequence. Accesses begin with the registration of an Active command, which is then followed by a Read or Write command. The address bits registered coincident with the Active command are used to select the bank and row to be accessed (BA0, BA1 select the bank; A0-A11 select the row). The address bits registered coincident with the Read or Write command are used to select the starting column location for the burst access. Prior to normal operation, the DDR SDRAM must be initialized. The following sections provide detailed information covering device initialization, register definition, command descriptions and device operation.
Initialization
Only one of the following two conditions must be met. * No power sequencing is specified during power up or power down given the following criteria: VDD and VDDQ are driven from a single power converter output VTT meets the specification A minimum resistance of 42 ohms limits the input current from the VTT supply into any pin and VREF tracks VDDQ /2 or * The following relationships must be followed: VDDQ is driven after or with VDD such that VDDQ < VDD + 0.3V VTT is driven after or with VDDQ such that VTT < VDDQ + 0.3V VREF is driven after or with VDDQ such that VREF < VDDQ + 0.3V The DQ and DQS outputs are in the High-Z state, where they remain until driven in normal operation (by a read access). After all power supply and reference voltages are stable, and the clock is stable, the DDR SDRAM requires a 200s delay prior to applying an executable command. Once the 200s delay has been satisfied, a Deselect or NOP command should be applied, and CKE must be brought HIGH. Following the NOP command, a Precharge ALL command must be applied. Next a Mode Register Set command must be issued for the Extended Mode Register, to enable the DLL, then a Mode Register Set command must be issued for the Mode Register, to reset the DLL, and to program the operating parameters. 200 clock cycles are required between the DLL reset and any read command. A Precharge ALL command should be applied, placing the device in the "all banks idle" state Once in the idle state, two auto refresh cycles must be performed. Additionally, a Mode Register Set command for the Mode Register, with the reset DLL bit deactivated (i.e. to program operating parameters without resetting the DLL) must be performed. Following these cycles, the DDR SDRAM is ready for normal operation. DDR SDRAM's may be reinitialized at any time during normal operation by asserting a valid MRS command to either the base or extended mode registers without affecting the contents of the memory array. The contents of either the mode register or extended mode register can be modified at any valid time during device operation without affecting the state of the internal address refresh counters used for device refresh.
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(c)
5
IS43R16800A1
Register Definition
Mode Register
ISSI
(R)
The Mode Register is used to define the specific mode of operation of the DDR SDRAM. This definition includes the selection of a burst length, a burst type, a CAS latency, and an operating mode. The Mode Register is programmed via the Mode Register Set command (with BA0 = 0 and BA1 = 0) and retains the stored information until it is programmed again or the device loses power (except for bit A8, which is self-clearing). Mode Register bits A0-A2 specify the burst length, A3 specifies the type of burst (sequential or interleaved), A4-A6 specify the CAS latency, and A7-A11 specify the operating mode. The Mode Register must be loaded when all banks are idle, and the controller must wait the specified time before initiating the subsequent operation. Violating either of these requirements results in unspecified operation.
Burst Length
Read and write accesses to the DDR SDRAM are burst oriented, with the burst length being programmable. The burst length determines the maximum number of column locations that can be accessed for a given Read or Write command. Burst lengths of 2, 4, or 8 locations are available for both the sequential and the interleaved burst types. Reserved states should not be used, as unknown operation or incompatibility with future versions may result. When a Read or Write command is issued, a block of columns equal to the burst length is effectively selected. All accesses for that burst take place within this block, meaning that the burst wraps within the block if a boundary is reached. The block is uniquely selected by A1-Ai when the burst length is set to two, by A2-Ai when the burst length is set to four and by A3-Ai when the burst length is set to eight (where Ai is the most significant column address bit for a given configuration). The remaining (least significant) address bit(s) is (are) used to select the starting location within the block. The programmed burst length applies to both Read and Write bursts.
6
N
Integrated Silicon Solution, Inc. -- 1-800-379-4774
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IS43R16800A1
ISSI
A11 A10 A9 A8 A7 A6 A5 A4 A3 BT A2 A1 A0 Address Bus Mode Register
(R)
Mode Register Operation
BA1 0* BA0 0*
Operating Mode
CAS Latency
Burst Length
A11 - A9 0 0 0
A8 0 1 0
A7 0 0 1
A6 - A0 Valid Valid VS**
Operating Mode Normal operation Do not reset DLL Normal operation in DLL Reset Vendor-Specific Test Mode Reserved A3 0 1 Burst Type Sequential Interleave
-
-
-
CAS Latency
A6 0 0 0 0 1 1 1 1 A5 0 0 1 1 0 0 1 1 A4 0 1 0 1 0 1 0 1 Latency Reserved Reserved 2 3 (Option) Reserved 1.5 (Option) 2.5 Reserved A2 0 0 0 0 1 1 1 1 A1 0 0 1 1 0 0 1 1
Burst Length
A0 0 1 0 1 0 1 0 1 Burst Length Reserved 2 4 8 Reserved Reserved Reserved Reserved
VS** Vendor Specific * BA0 and BA1 must be 0, 0 to select the Mode Register (vs. the Extended Mode Register).
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7
IS43R16800A1
ISSI
Order of Accesses Within a Burst Type = Sequential 0-1 1-0 0-1-2-3 1-2-3-0 2-3-0-1 3-0-1-2 0-1-2-3-4-5-6-7 1-2-3-4-5-6-7-0 2-3-4-5-6-7-0-1 3-4-5-6-7-0-1-2 4-5-6-7-0-1-2-3 5-6-7-0-1-2-3-4 6-7-0-1-2-3-4-5 7-0-1-2-3-4-5-6 Type = Interleaved 0-1 1-0 0-1-2-3 1-0-3-2 2-3-0-1 3-2-1-0 0-1-2-3-4-5-6-7 1-0-3-2-5-4-7-6 2-3-0-1-6-7-4-5 3-2-1-0-7-6-5-4 4-5-6-7-0-1-2-3 5-4-7-6-1-0-3-2 6-7-4-5-2-3-0-1 7-6-5-4-3-2-1-0 A1 A0 0
(R)
Burst Definition
Starting Column Address Burst Length A2 2 0 0 4 1 1 0 0 0 0 8 1 1 1 1 0 0 1 1 0 0 1 1
1 0 1 0 1 0 1 0 1 0 1 0 1
Notes: 1. For a burst length of two, A1-A i selects the two-data-element block; A0 selects the first access within the block. 2. For a burst length of four, A2-A i selects the four-data-element block; A0-A1 selects the first access within the block. 3. For a burst length of eight, A3-A i selects the eight-data- element block; A0-A2 selects the first access within the block. 4. Whenever a boundary of the block is reached within a given sequence above, the following access wraps within the block. Burst Type Accesses within a given burst may be programmed to be either sequential or interleaved; this is referred to as the burst type and is selected via bit A3. The ordering of accesses within a burst is determined by the burst length, the burst type and the starting column address, as shown in Burst Definition. Read Latency The Read latency, or CAS latency, is the delay, in clock cycles, between the registration of a Read command and the availability of the first burst of output data. The latency can be programmed 2 or 2.5 clocks. If a Read command is registered at clock edge n, and the latency is m clocks, the data is available nominally coincident with clock edge n + m. Reserved states should not be used as unknown operation or incompatibility with future versions may result.
8
N
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IS43R16800A1
Operating Mode
ISSI
(R)
The normal operating mode is selected by issuing a Mode Register Set Command with bits A7-A11 to zero, and bits A0-A6 set to the desired values. A DLL reset is initiated by issuing a Mode Register Set command with bits A7 and A9-A11 each set to zero, bit A8 set to one, and bits A0-A6 set to the desired values. A Mode Register Set command issued to reset the DLL should always be followed by a Mode Register Set command to select normal operating mode. All other combinations of values for A7-A11 are reserved for future use and/or test modes. Test modes and reserved states should not be used as unknown operation or incompatibility with future versions may result.
CAS Latencies
CAS Latency = 2.5, BL = 4
CK CK Command Read NOP CL=2.5 DQS DQ NOP NOP NOP NOP
Shown with nominal tAC, tDQSCK, and tDQSQ.
Don't Care
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N
9
IS43R16800A1
Extended Mode Register
ISSI
(R)
The Extended Mode Register controls functions beyond those controlled by the Mode Register; these additional functions include DLL enable/disable, bit A0; output drive strength selection, bit A1; and QFC output enable/disable, bit A2 (NTC optional). These functions are controlled via the bit settings shown in the Extended Mode Register Definition. The Extended Mode Register is programmed via the Mode Register Set command (with BA0 = 1 and BA1 = 0) and retains the stored information until it is programmed again or the device loses power. The Extended Mode Register must be loaded when all banks are idle, and the controller must wait the specified time before initiating any subsequent operation. Violating either of these requirements result in unspecified operation.
DLL Enable/Disable
The DLL must be enabled for normal operation. DLL enable is required during power up initialization, and upon returning to normal operation after having disabled the DLL for the purpose of debug or evaluation. The DLL is automatically disabled when entering self refresh operation and is automatically re-enabled upon exit of self refresh operation. Any time the DLL is enabled, 200 clock cycles must occur to allow time for the internal clock to lock to the externally applied clock before a Read command can be issued. This is the reason for introducing timing parameter tXSRD for DDR SDRAM's (Exit Self Refresh to Read Command). Non- Read commands can be issued 2 clocks after the DLL is enabled via the EMRS command (tMRD) or 10 clocks after the DLL is enabled via self refresh exit command (tXSNR, Exit Self Refresh to Non-Read Command).
Output Drive Strength
The normal drive strength for all outputs is specified to be SSTL_2, Class II.
QFC Enable/Disable
The QFC signal is an optional DRAM output control used to isolate module loads (DIMMs) from the system memory bus by means of external FET switches when the given module (DIMM) is not being accessed. The QFC function is an optional feature for this device and is not included on all DDR SDRAM devices.
10
N
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IS43R16800A1
Extended Mode Register Definition
BA1 0* BA0 1* A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 QFC A1 DS A0 DLL
ISSI
Address Bus Extended Mode Register
(R)
Operating Mode
Drive Strength
A11 - A3 0 A2 - A0 Valid Operating Mode Normal Operation All other states Reserved 0 1 Normal Reserved A1 Drive Strength
-
-
A2 0 1
QFC Disable Enable (Optional) A0 0 DLL Enable Disable
* BA0 and BA1 must be 1, 0 to select the Extended Mode Register (vs. the base Mode Register)
1
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IS43R16800A1
Commands
ISSI
(R)
Truth Tables 1a and 1b provide a reference of the commands supported by DDR SDRAM devices. A verbal description of each commands follows.
Truth Table 1a: Commands
Name (Function) Deselect (Nop) No Operation (Nop) Active (Select Bank And Activate Row) Read (Select Bank And Column, And Start Read Burst) Write (Select Bank And Column, And Start Write Burst) Burst Terminate Precharge (Deactivate Row In Bank Or Banks) Auto Refresh Or Self Refresh (Enter Self Refresh Mode) Mode Register Set CS H L L L L L L L L RAS X H L H H H L L L CAS X H H L L H H L L WE X H H H L L L H L Address X X Bank/Row Bank/Col Bank/Col X Code X Op-Code MNE NOP NOP ACT Read Write BST PRE AR / SR MRS Notes 1, 9 1, 9 1, 3 1, 4 1, 4 1, 8 1, 5 1, 6, 7 1, 2
1. CKE is high for all commands shown except Self Refresh. 2. BA0, BA1 select either the Base or the Extended Mode Register (BA0 = 0, BA1 = 0 selects Mode Register; BA0 = 1, BA1 = 0 selects Extended Mode Register; other combinations of BA0-BA1 are reserved; A0-A11 provide the op-code to be written to the selected Mode Register.) 3. BA0-BA1 provide bank address and A0-A11 provide row address. 4. BA0, BA1 provide bank address; A0-A8 provide column address ; A10 high enables the Auto Precharge feature (non-persistent), A10 low disables the Auto Precharge feature. 5. A10 LOW: BA0, BA1 determine which bank is precharged. A10 HIGH: all banks are precharged and BA0, BA1 are "Don't Care." 6. This command is auto refresh if CKE is high; Self Refresh if CKE is low. 7. Internal refresh counter controls row and bank addressing; all inputs and I/Os are "Don't Care" except for CKE. 8. Applies only to read bursts with Auto Precharge disabled; this command is undefined (and should not be used) for read bursts with Auto Precharge enabled or for write bursts 9. Deselect and NOP are functionally interchangeable.
Truth Table 1b: DM Operation
Name (Function) Write Enable Write Inhibit 1. Used to mask write data; provided coincident with the corresponding data. DM L H DQs Valid X Notes 1 1
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IS43R16800A1
Deselect
ISSI
(R)
The Deselect function prevents new commands from being executed by the DDR SDRAM. The DDR SDRAM is effectively deselected. Operations already in progress are not affected. No Operation (NOP)
The No Operation (NOP) command is used to perform a NOP to a DDR SDRAM. This prevents unwanted commands from being registered during idle or wait states. Operations already in progress are not affected.
Mode Register Set
The mode registers are loaded via inputs A0-A11, BA0 and BA1 while issuing the Mode Register Set Command. See mode register descriptions in the Register Definition section. The Mode Register Set command can only be issued when all banks are idle and no bursts are in progress. A subsequent executable command cannot be issued until tMRD is met.
Active
The Active command is used to open (or activate) a row in a particular bank for a subsequent access. The value on the BA0, BA1 inputs selects the bank, and the address provided on inputs A0-A11 selects the row. This row remains active (or open) for accesses until a Precharge (or Read or Write with Auto Precharge) is issued to that bank. A Precharge (or Read or Write with Auto Precharge) command must be issued and completed before opening a different row in the same bank.
Read
The Read command is used to initiate a burst read access to an active (open) row. The value on the BA0, BA1 inputs selects the bank, and the address provided on inputs A0-A8 selects the starting column location. The value on input A10 determines whether or not Auto Precharge is used. If Auto Precharge is selected, the row being accessed is precharged at the end of the Read burst; if Auto Precharge is not selected, the row remains open for subsequent accesses.
Write
The Write command is used to initiate a burst write access to an active (open) row. The value on the BA0, BA1 inputs selects the bank, and the address provided on inputs A0-A8 selects the starting column location. The value on input A10 determines whether or not Auto Precharge is used. If Auto Precharge is selected, the row being accessed is precharged at the end of the Write burst; if Auto Precharge is not selected, the row remains open for subsequent accesses. Input data appearing on the DQs is written to the memory array subject to the DM input logic level appearing coincident with the data. If a given DM signal is registered low, the corresponding data is written to memory; if the DM signal is registered high, the corresponding data inputs are ignored, and a Write is not executed to that byte/column location.
Precharge
The Precharge command is used to deactivate (close) the open row in a particular bank or the open row(s) in all banks. The bank(s) will be available for a subsequent row access a specified time (tRP) after the Precharge command is issued. Input A10 determines whether one or all banks are to be precharged, and in the case where only one bank is to be precharged, inputs BA0, BA1 select the bank. Otherwise BA0, BA1 are treated as "Don't Care." Once a bank has been precharged, it is in the idle state and must be activated prior to any Read or Write commands being issued to that bank. A precharge command is treated as a NOP if there is no open row in that bank, or if the previously open row is already in the process of precharging.
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IS43R16800A1
Auto Precharge
ISSI
(R)
Auto Precharge is a feature which performs the same individual-bank precharge function described above, but without requiring an explicit command. This is accomplished by using A10 to enable Auto Precharge in conjunction with a specific Read or Write command. A precharge of the bank/row that is addressed with the Read or Write command is automatically performed upon completion of the Read or Write burst. Auto Precharge is non-persistent in that it is either enabled or disabled for each individual Read or Write command. Auto Precharge ensures that the precharge is initiated at the earliest valid stage within a burst. This is determined as if an explicit Precharge command was issued at the earliest possible time without violating tRAS(min). The user must not issue another command to the same bank until the precharge (tRP) is completed. The NTC DDR SDRAM devices supports the optional tRAS lockout feature. This feature allows a Read command with Auto Precharge to be issued to a bank that has been activated (opened) but has not yet satisfied the tRAS(min) specification. The tRAS lockout feature essentially delays the onset of the auto precharge operation until two conditions occur. One, the entire burst length of data has been successfully prefetched from the memory array; and two, tRAS(min) has been satisfied. As a means to specify whether a DDR SDRAM device supports the tRAS lockout feature, a new parameter has been defined, tRAP (RAS Command to Read Command with Auto Precharge or better stated Bank Activate to Read Command with Auto Precharge). For devices that support the tRAS lockout feature, tRAP = tRCD(min). This allows any Read Command (with or without Auto Precharge) to be issued to an open bank once tRCD(min) is satisfied.
tRAP Definition
CL=2, tCK=10ns CK CK Command DQ (BL=2) tRASmin Command DQ (BL=4)
NOP ACT NOP RD A NOP NOP DQ0 NOP ACT NOP RD A NOP NOP DQ0 NOP DQ1 NOP ACT NOP NOP
*
DQ1
tRPmin
NOP DQ3 ACT NOP NOP
NOP DQ2
Command DQ (BL=8)
NOP
ACT
NOP
RD A
NOP
NOP DQ0
*
DQ1
tRPmin
NOP DQ3 DQ4 NOP DQ5 DQ6 ACT DQ7 NOP
NOP DQ2
tRCDmin tRAPmin
The above timing diagrams show the effects of tRAP for devices that support tRAS lockout. In these cases, the Read with Auto Precharge command (RDA) is issued with tRCD(min) and dataout is available with the shortest latency from the Bank Activate command (ACT). The internal precharge operation, however, does not begin until after tRAS(min) is satisfied.
*
*
tRPmin
Indicates Auto Precharge begins here
Burst Terminate
The Burst Terminate command is used to truncate read bursts (with Auto Precharge disabled). The most re-cently registered Read command prior to the Burst Terminate command is truncated, as shown in the Operation section of this data sheet. Write burst cycles are not to be terminated with the Burst Terminate command.
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IS43R16800A1
Auto Refresh
ISSI
(R)
Auto Refresh is used during normal operation of the DDR SDRAM and is analogous to CAS Before RAS (CBR) Refresh in previous DRAM types. This command is nonpersistent, so it must be issued each time a refresh is required. The refresh addressing is generated by the internal refresh controller. This makes the address bits "Don't Care" during an Auto Refresh command. The 128Mb DDR SDRAM requires Auto Refresh cycles at an average periodic interval of 7.8s (maximum).
Self Refresh
The Self Refresh command can be used to retain data in the DDR SDRAM, even if the rest of the system is powered down. When in the self refresh mode, the DDR SDRAM retains data without external clocking. The Self Refresh command is initiated as an Auto Refresh command coincident with CKE transitioning low. The DLL is automatically disabled upon entering Self Refresh, and is automatically enabled upon exiting Self Refresh (200 clock cycles must then occur before a Read command can be issued). Input signals except CKE (low) are "Don't Care" during Self Refresh operation. The procedure for exiting self refresh requires a sequence of commands. CK (and CK) must be stable prior to CKE returning high. Once CKE is high, the SDRAM must have NOP commands issued for tXSNR because time is required for the completion of any internal refresh in progress. A simple algorithm for meeting both refresh and DLL requirements is to apply NOPs for 200 clock cycles before applying any other command.
Integrated Silicon Solution, Inc. -- 1-800-379-4774
Rev. 00A 04/17/06
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(c)
15
IS43R16800A1
Operations
Bank/Row Activation
ISSI
(R)
Before any Read or Write commands can be issued to a bank within the DDR SDRAM, a row in that bank must be "opened" (activated). This is accomplished via the Active command and addresses A0-A11, BA0 and BA1 (see Activating a Specific Row in a Specific Bank), which decode and select both the bank and the row to be activated. After opening a row (issuing an Active command), a Read or Write command may be issued to that row, subject to the tRCD specification. A subsequent Active command to a different row in the same bank can only be issued after the previous active row has been "closed" (precharged). The minimum time interval between successive Active commands to the same bank is defined by tRC. A subsequent Active command to another bank can be issued while the first bank is being accessed, which results in a reduction of total row-access overhead. The minimum time interval between successive Active commands to different banks is defined by tRRD.
Activating a Specific Row in a Specific Bank
CK CK CKE CS RAS CAS WE A0-A11 BA0, BA1 RA BA RA = row address. BA = bank address. Don't Care HIGH
16
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Integrated Silicon Solution, Inc. -- 1-800-379-4774
(c)
Rev. 00A 04/17/06
IS43R16800A1
tRCD and tRRD Definition
CK CK Command A0-A11A11 BA0, BA1
ACT ROW BA x NOP ACT ROW BA y NOP NOP RD/WR COL BA y NOP
ISSI
(R)
NOP
tRRD
tRCD
Don't Care
Reads
Subsequent to programming the mode register with CAS latency, burst type, and burst length, Read bursts are initiated with a Read command. The starting column and bank addresses are provided with the Read command and Auto Precharge is either enabled or disabled for that burst access. If Auto Precharge is enabled, the row that is accessed starts precharge at the completion of the burst, provided tRAS has been satisfied. For the generic Read commands used in the following illustrations, Auto Precharge is disabled. During Read bursts, the valid data-out element from the starting column address is available following the CAS latency after the Read command. Each subsequent data-out element is valid nominally at the next positive or negative clock edge (i.e. at the next crossing of CK and CK). The following timing figure entitled "Read Burst: CAS Latencies (Burst Length=4)" illustrates the general timing for each supported CAS latency setting. DQS is driven by the DDR SDRAM along with output data. The initial low state on DQS is known as the read preamble; the low state coincident with the last data-out element is known as the read postamble. Upon completion of a burst, assuming no other commands have been initiated, the DQs and DQS goes High-Z. Data from any Read burst may be concatenated with or truncated with data from a subsequent Read command. In either case, a continuous flow of data can be maintained. The first data element from the new burst follows either the last element of a completed burst or the last desired data element of a longer burst which is being truncated. The new Read command should be issued x cycles after the first Read command, where x equals the number of desired data element pairs (pairs are required by the 2n prefetch architecture). This is shown in timing figure entitled "Consecutive Read Bursts: CAS Latencies (Burst Length =4 or 8)". A Read command can be initiated on any positive clock cycle following a previous Read command. Nonconsecutive Read data is shown in timing figure entitled "Non-Consecutive Read Bursts: CAS Latencies (Burst Length = 4)". Full-speed Random Read Accesses: CAS Latencies (Burst Length = 2, 4 or 8) within a page (or pages) can be performed.
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IS43R16800A1
ISSI
(R)
Read Command
CK CK CKE CS RAS CAS WE HIGH
A0-A8 A10
CA EN AP DIS AP CA = column address BA = bank address EN AP = enable Auto Precharge DIS AP = disable Auto Precharge Don't Care
BA0, BA1
BA
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Integrated Silicon Solution, Inc. -- 1-800-379-4774
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Rev. 00A 04/17/06
IS43R16800A1
Read Burst: CAS Latencies (Burst Length = 4)
CAS Latency = 2
CK CK Command Address
Read
BA a,COL n
ISSI
(R)
NOP
NOP
NOP
NOP
NOP
CL=2 DQS DQ tQCS QFC (Optional)
DOa-n
tQCH
CAS Latency = 2.5
CK CK Command Address
Read BA a,COL n NOP NOP NOP NOP NOP
CL=2.5 DQS DQ
DOa-n
QFC
(Optional)
tQCS
tQCH
Don't Care DO a-n = data out from bank a, column n. 3 subsequent elements of data out appear in the programmed order following DO a-n. Shown with nominal tAC, tDQSCK, and tDQSQ. QFC is an open drain driver. The output high level is achieved through an external pull up resistor connected to VDDQ.
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19
IS43R16800A1
Consecutive Read Bursts: CAS Latencies (Burst Length = 4 or 8)
ISSI
CAS Latency = 2
(R)
CK CK Command Address
Read NOP Read NOP NOP NOP
BAa, COL n
BAa, COL b
CL=2 DQS DQ
DOa-n DOa-b
CAS Latency = 2.5
CK CK Command Address
Read
BAa, COL n
NOP
Read
BAa,COL b
NOP
NOP
NOP
CL=2.5 DQS DQ
DOa- n DOa- b
DO a-n (or a-b) = data out from bank a, column n (or bank a, column b). When burst length = 4, the bursts are concatenated. When burst length = 8, the second burst interrupts the first. 3 subsequent elements of data out appear in the programmed order following DO a-n. 3 (or 7) subsequent elements of data out appear in the programmed order following DO a-b. Shown with nominal tAC, tDQSCK, and tDQSQ.
Don't Care
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Integrated Silicon Solution, Inc. -- 1-800-379-4774
(c)
Rev. 00A 04/17/06
IS43R16800A1
Non-Consecutive Read Bursts: CAS Latencies (Burst Length = 4)
CAS Latency = 2
CK CK Command Address
Read
BAa, COL n
ISSI
(R)
NOP
NOP
Read
BAa, COL b
NOP
NOP
CL=2 DQS DQ
DO a-n DOa- b
CAS Latency = 2.5
CK CK Command Address
Read
BAa, COL n
NOP
NOP
Read
BAa, COL b
NOP
NOP
NOP
CL=2.5 DQS DQ
DO a-n DOa- b
DO a-n (or a-b) = data out from bank a, column n (or bank a, column b). 3 subsequent elements of data out appear in the programmed order following DO a-n (and following DO a-b). Shown with nominal tAC, tDQSCK, and tDQSQ.
Don't Care
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(c)
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IS43R16800A1
Random Read Accesses: CAS Latencies (Burst Length = 2, 4 or 8)
ISSI
CAS Latency = 2
(R)
CK CK Command Address
Read
BAa, COL n
Read
BAa, COL x
Read
BAa, COL b
Read
BAa, COL g
NOP
NOP
CL=2 DQS DQ
DOa-n DOa-n' DOa-x DOa-x' DOa-b DOa-b' DOa-g
CAS Latency = 2.5
CK CK Command Address
Read Read Read Read NOP NOP
BAa, COL n
BAa, COL x
BAa, COL b
BAa, COL g
CL=2.5 DQS DQ
DOa-n DOa-n' DOa-x DOa-x' DOa-b DOa-b'
DO a-n, etc. = data out from bank a, column n etc. n' etc. = odd or even complement of n, etc. (i.e., column address LSB inverted). Reads are to active rows in any banks. Shown with nominal tAC, tDQSCK, and tDQSQ.
Don't Care
22
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Integrated Silicon Solution, Inc. -- 1-800-379-4774 (c)
Rev. 00A 04/17/06
IS43R16800A1
ISSI
(R)
Data from any Read burst may be truncated with a Burst Terminate command, as shown in timing figure entitled Terminating a Read Burst: CAS Latencies (Burst Length = 8). The Burst Terminate latency is equal to the read (CAS) latency, i.e. the Burst Terminate command should be issued x cycles after the Read command, where x equals the number of desired data element pairs. Data from any Read burst must be completed or truncated before a subsequent Write command can be issued. If truncation is necessary, the Burst Terminate command must be used, as shown in timing figure entitled Read to Write: CAS Latencies (Burst Length = 4 or 8). The example is shown for tDQSS(min). The tDQSS(max) case, not shown here, has a longer bus idle time. tDQSS(min) and tDQSS(max) are defined in the section on Writes. A Read burst may be followed by, or truncated with, a Precharge command to the same bank (provided that Auto Precharge was not activated). The Precharge command should be issued x cycles after the Read command, where x equals the number of desired data element pairs (pairs are required by the 2n prefetch architecture). This is shown in timing figure Read to Precharge: CAS Latencies (Burst Length = 4 or 8) for Read latencies of 2 and 2.5. Following the Precharge command, a subsequent command to the same bank cannot be issued until tRP is met. Note that part of the row precharge time is hidden during the access of the last data elements. In the case of a Read being executed to completion, a Precharge command issued at the optimum time (as described above) provides the same operation that would result from the same Read burst with Auto Precharge enabled. The disadvantage of the Precharge command is that it requires that the command and address busses be available at the appropriate time to issue the command. The advantage of the Precharge command is that it can be used to truncate bursts.
Integrated Silicon Solution, Inc. -- 1-800-379-4774
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IS43R16800A1
Terminating a Read Burst: CAS Latencies (Burst Length = 8)
ISSI
CAS Latency = 2
(R)
CK CK Command Address
Read
BAa, COL n
NOP
BST
NOP
NOP
NOP
CL=2 DQS DQ
DOa-n
No further output data after this point. DQS tristated. CAS Latency = 2.5
CK CK Command Address
Read
BAa, COL n
NOP
BST
NOP
NOP
NOP
CL=2.5 DQS DQ
DOa-n
No further output data after this point. DQS tristated.
DO a-n = data out from bank a, column n. Cases shown are bursts of 8 terminated after 4 data elements. 3 subsequent elements of data out appear in the programmed order following DO a-n. Shown with nominal tAC, tDQSCK, and tDQSQ.
Don't Care
(c)
N.
24
Integrated Silicon Solution, Inc. -- 1-800-379-4774
Rev. 00A 04/17/06
IS43R16800A1
Read to Write: CAS Latencies (Burst Length = 4 or 8)
CAS Latency = 2
CK CK Command Address
Read
BAa, COL n
ISSI
(R)
BST
NOP
Write
BAa, COL b
NOP
NOP
CL=2 DQS DQ DM
DOa-n
tDQSS (min)
DI a-b
CAS Latency = 2.5
CK CK Command Address
Read
BAa, COL n
BST
NOP
NOP
Write
BAa, COL b
NOP
CL=2.5 DQS DQ DM
DOa-n
tDQSS (min)
Dla-b
DO a-n = data out from bank a, column n . a-b = data in to bank a, column b DI 1 subsequent elements of data out appear in the programmed order following DO a-n. Data In elements are applied following Dl a-b in the programmed order, according to burst length. Shown with nominal tAC, tDQSCK, and tDQSQ.
Don't Care
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IS43R16800A1
ISSI
CAS Latency = 2
(R)
Read to Precharge: CAS Latencies (Burst Length = 4 or 8)
CK CK Command
Read NOP PRE NOP NOP ACT
tRP Address
BA a, COL n BA a or all BA a, ROW
CL=2 DQS DQ
DOa-n
CAS Latency = 2.5
CK CK Command
Read NOP PRE NOP NOP ACT
tRP Address
BA a, COL n BA a or all BA a, ROW
CL=2.5 DQS DQ
DOa-n
DO a-n = data out from bank a, column n. Cases shown are either uninterrupted bursts of 4 or interrupted bursts of 8. 3 subsequent elements of data out appear in the programmed order following DO a-n. Shown with nominal tAC, tDQSCK, and tDQSQ.
Don't Care
26
N
Integrated Silicon Solution, Inc. -- 1-800-379-4774
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Rev. 00A 04/17/06
IS43R16800A1
Writes
Write bursts are initiated with a Write command, as shown in timing figure Write Command.
ISSI
(R)
The starting column and bank addresses are provided with the Write command, and Auto Precharge is either enabled or disabled for that access. If Auto Precharge is enabled, the row being accessed is precharged at the completion of the burst. For the generic Write commands used in the following illustrations, Auto Precharge is disabled. During Write bursts, the first valid data-in element is registered on the first rising edge of DQS following the write command, and subsequent data elements are registered on successive edges of DQS. The Low state on DQS between the Write command and the first rising edge is known as the write preamble; the Low state on DQS following the last data-in element is known as the write postamble. The time between the Write command and the first corresponding rising edge of DQS (tDQSS) is specified with a relatively wide range (from 75% to 125% of one clock cycle), so most of the Write diagrams that follow are drawn for the two extreme cases (i.e. tDQSS(min) and tDQSS(max)). Timing figure Write Burst (Burst Length = 4) shows the two extremes of tDQSS for a burst of four. Upon completion of a burst, assuming no other commands have been initiated, the DQs and DQS enters High-Z and any additional input data is ignored. Data for any Write burst may be concatenated with or truncated with a subsequent Write command. In either case, a continuous flow of input data can be maintained. The new Write command can be issued on any positive edge of clock following the previous Write command. The first data element from the new burst is applied after either the last element of a completed burst or the last desired data element of a longer burst which is being truncated. The new Write command should be issued x cycles after the first Write command, where x equals the number of desired data element pairs (pairs are required by the 2n prefetch architecture). Timing figure Write to Write (Burst Length = 4) shows concatenated bursts of 4. An example of nonconsecutive Writes is shown in timing figure Write to Write: Max DQSS, Non-Consecutive (Burst Length = 4). Fullspeed random write accesses within a page or pages can be performed as shown in timing figure Random Write Cycles (Burst Length = 2, 4 or 8). Data for any Write burst may be followed by a subsequent Read command. To follow a Write without truncating the write burst, tWTR (Write to Read) should be met as shown in timing figure Write to Read: Non-Interrupting (CAS Latency = 2; Burst Length = 4). Data for any Write burst may be truncated by a subsequent (interrupting) Read command. This is illustrated in timing figures "Write to Read: Interrupting (CAS Latency =2; Burst Length = 8)", "Write to Read: Minimum DQSS, Odd Number of Data (3 bit Write), Interrupting (CAS Latency = 2; Burst Length = 8)", and "Write to Read: Nominal DQSS, Interrupting (CAS Latency = 2; Burst Length = 8)". Note that only the data-in pairs that are registered prior to the tWTR period are written to the internal array, and any subsequent data-in must be masked with DM, as shown in the diagrams noted previously. Data for any Write burst may be followed by a subsequent Precharge command. To follow a Write without truncating the write burst, tWR should be met as shown in timing figure Write to Precharge: Non-Interrupting (Burst Length = 4). Data for any Write burst may be truncated by a subsequent Precharge command, as shown in timing figures Write to Precharge: Interrupting (Burst Length = 4 or 8) to Write to Precharge: Nominal DQSS (2 bit Write), Interrupting (Burst Length = 4 or 8). Note that only the data-in pairs that are registered prior to the tWR period are written to the internal array, and any subsequent data in should be masked with DM. Following the Precharge command, a subsequent command to the same bank cannot be issued until tRP is met. In the case of a Write burst being executed to completion, a Precharge command issued at the optimum time (as described above) provides the same operation that would result from the same burst with Auto Precharge. The disadvantage of the Precharge command is that it requires that the command and address busses be available at the appropriate time to issue the command. The advantage of the Precharge command is that it can be used to truncate bursts.
Integrated Silicon Solution, Inc. -- 1-800-379-4774
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(c)
27
IS43R16800A1
ISSI
(R)
Write Command
CK CK CKE CS RAS CAS WE HIGH
A0-A9
CA EN AP
A10 DIS AP BA0, BA1 BA CA = column address BA = bank address EN AP = enable Auto Precharge DIS AP = disable Auto Precharge Don't Care
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Integrated Silicon Solution, Inc. -- 1-800-379-4774
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Rev. 00A 04/17/06
IS43R16800A1
Write Burst (Burst Length = 4)
Maximum DQSS
T1 CK CK Command Address
Write
BA a, COL b
ISSI
T2 T3 T4
(R)
NOP
NOP
NOP
tDQSS (max) DQS DQ DM tQCSW(max) QFC (Optional) tQCHW(min)
Dla-b
Minimum DQSS
T1 CK CK Command Address
Write BA a, COL b NOP NOP NOP
T2
T3
T4
tDQSS (min) DQS DQ DM tQCSW(max) QFC tQCHW(max)
Dla-b
DI a-b = data in for bank a, column b. 3 subsequent elements of data in are applied in the programmed order following DI a-b. A non-interrupted burst is shown. A10 is Low with the Write command (Auto Precharge is disabled). QFC is an open drain driver. Its output high level is achieved through an externally connected pull up resistor connected to VDDQ. Don't Care
(c)
Integrated Silicon Solution, Inc. -- 1-800-379-4774
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IS43R16800A1
ISSI
Maximum DQSS
T1 T2 T3 T4 T5 T6
(R)
Write to Write (Burst Length = 4)
CK CK Command Address
Write NOP Write NOP NOP NOP
BAa, COL b
BAa, COL n
tDQSS (max) DQS DQ DM
DI a-b DI a-n
Minimum DQSS
T1 CK CK Command Address
Write
BA, COL b
T2
T3
T4
T5
T6
NOP
Write
BA, COL n
NOP
NOP
NOP
tDQSS (min) DQS DQ DM
DI a-b DI a-n
DI a-b = data in for bank a, column b, etc. 3 subsequent elements of data in are applied in the programmed order following DI a-b. 3 subsequent elements of data in are applied in the programmed order following DI a-n. A non-interrupted burst is shown. Each Write command may be to any bank.
Don't Care
30
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Integrated Silicon Solution, Inc. -- 1-800-379-4774
(c)
Rev. 00A 04/17/06
IS43R16800A1
Write to Write: Max DQSS, Non-Consecutive (Burst Length = 4)
ISSI
T1 T2 T3 T4 T5
(R)
CK CK Command Address
Write NOP NOP Write NOP
BAa, COL b
BAa, COL n
tDQSS (max) DQS DQ DM
DI a-b DI a-n
DI a-b, etc. = data in for bank a, column b, etc. 3 subsequent elements of data in are applied in the programmed order following DI a-b. 3 subsequent elements of data in are applied in the programmed order following DI a-n. A non-interrupted burst is shown. Each Write command may be to any bank.
Don't Care
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IS43R16800A1
Random Write Cycles (Burst Length = 2, 4 or 8)
ISSI
Maximum DQSS
T1 T2 T3 T4 T5
(R)
CK CK Command Address
Write
BAa, COL b
Write
BAa, COL x
Write
BAa, COL n
Write
BAa, COL a
Write
BAa, COL g
tDQSS (max) DQS DQ DM
DI a-b DI a-b' DI a-x DI a-x' DI a-n DI a-n' DI a-a DI a-a'
Minimum DQSS
T1 CK CK Command Address
Write
BAa, COL b
T2
T3
T4
T5
Write
BAa, COL x
Write
BAa, COL n
Write
BAa, COL a
Write
BAa, COL g
tDQSS (min) DQS DQ DM
DI a-b DI a-b' DI a-x DI a-x' DI a-n DI a-n' DI a-a DI a-a' DI a-g
DI a-b, etc. = data in for bank a, column b, etc. b', etc. = odd or even complement of b, etc. (i.e., column address LSB inverted). Each Write command may be to any bank.
Don't Care
32
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Integrated Silicon Solution, Inc. -- 1-800-379-4774 (c)
Rev. 00A 04/17/06
IS43R16800A1
Write to Read: Non-Interrupting (CAS Latency = 2; Burst Length = 4)
Maximum DQSS
T1 CK CK Command
Write NOP NOP NOP Read NOP
ISSI
T2 T3 T4 T5 T6
(R)
tWTR Address
BAa, COL b BAa, COL n
tDQSS (max) DQS DQ DM
DI a-b
CL = 2
Minimum DQSS
T1 CK CK Command
Write NOP NOP NOP Read NOP
T2
T3
T4
T5
T6
tWTR Address
BAa, COL b BAa, COL n
tDQSS (min) DQS DQ DM
DI a-b
CL = 2
DI a-b = data in for bank a, column b. 3 subsequent elements of data in are applied in the programmed order following DI a-b. A non-interrupted burst is shown. tWTR is referenced from the first positive CK edge after the last data in pair. A10 is Low with the Write command (Auto Precharge is disabled). The Read and Write commands may be to any bank.
Don't Care
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Integrated Silicon Solution, Inc. -- 1-800-379-4774
Rev. 00A 04/17/06
33
IS43R16800A1
Write to Read: Interrupting (CAS Latency = 2; Burst Length = 8)
ISSI
Maximum DQSS
T1 T2 T3 T4 T5 T6
(R)
CK CK Command
Write NOP NOP NOP Read NOP
tWTR Address
BAa, COL b BAa, COL n
tDQSS (max) DQS DQ DM
DIa- b
CL = 2
1
1
Minimum DQSS
T1 CK CK Command
Write NOP NOP NOP Read NOP
T2
T3
T4
T5
T6
tWTR Address
BAa, COL b BAa, COL n
tDQSS (min) DQS DQ DM
DI a-b
CL = 2
1
1
DI a-b = data in for bank a, column b. An interrupted burst is shown, 4 data elements are written. 3 subsequent elements of data in are applied in the programmed order following DI a-b. tWTR is referenced from the first positive CK edge after the last data in pair. The Read command masks the last 2 data elements in the burst. A10 is Low with the Write command (Auto Precharge is disabled). The Read and Write commands are not necessarily to the same bank. 1 = These bits are incorrectly written into the memory array if DM is low.
Don't Care
34
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Integrated Silicon Solution, Inc. -- 1-800-379-4774
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Rev. 00A 04/17/06
IS43R16800A1
ISSI
T1 T2 T3 T4 T5 T6
(R)
Write to Read: Minimum DQSS, Odd Number of Data (3 bit Write), Interrupting (CAS Latency = 2; Burst Length = 8)
CK CK Command
Write NOP NOP NOP Read NOP
tWTR Address
BAa, COL b BAa, COL n
tDQSS (min) DQS DQ DM
DI a-b
CL = 2
1
2
2
DI a-b = data in for bank a, column b. An interrupted burst is shown, 3 data elements are written. 2 subsequent elements of data in are applied in the programmed order following DI a-b. tWTR is referenced from the first positive CK edge after the last desired data in pair (not the last desired data in element) The Read command masks the last 2 data elements in the burst. A10 is Low with the Write command (Auto Precharge is disabled). The Read and Write commands are not necessarily to the same bank. 1 = This bit is correctly written into the memory array if DM is low. Don't Care 2 = These bits are incorrectly written into the memory array if DM is low.
Integrated Silicon Solution, Inc. -- 1-800-379-4774
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(c)
35
IS43R16800A1
ISSI
T1 T2 T3 T4 T5 T6
(R)
Write to Read: Nominal DQSS, Interrupting (CAS Latency = 2; Burst Length = 8)
CK CK Command
Write NOP NOP NOP Read NOP
tWTR Address
BAa, COL b BAa, COL n
tDQSS (nom) DQS DQ DM
DI a-b
CL = 2
1
1
DI a-b = data in for bank a, column b. An interrupted burst is shown, 4 data elements are written. 3 subsequent elements of data in are applied in the programmed order following DI a-b. tWTR is referenced from the first positive CK edge after the last desired data in pair. The Read command masks the last 2 data elements in the burst. A10 is Low with the Write command (Auto Precharge is disabled). The Read and Write commands are not necessarily to the same bank. 1 = These bits are incorrectly written into the memory array if DM is low.
Don't Care
36
N
Integrated Silicon Solution, Inc. -- 1-800-379-4774
(c)
Rev. 00A 04/17/06
IS43R16800A1
Write to Precharge: Non-Interrupting (Burst Length = 4)
Maximum DQSS
T1 CK CK Command
Write NOP NOP NOP NOP PRE
ISSI
T2 T3 T4 T5 T6
(R)
tWR Address
BA a, COL b BA (a or all)
tDQSS (max) DQS DQ DM
DI a-b
tRP
Minimum DQSS
T1 CK CK Command
Write NOP NOP NOP NOP PRE
T2
T3
T4
T5
T6
tWR Address
BA a, COL b BA (a or all)
tDQSS (min) DQS DQ DM
DI a-b
tRP
DI a-b = data in for bank a, column b. 3 subsequent elements of data in are applied in the programmed order following DI a-b. A non-interrupted burst is shown. tWR is referenced from the first positive CK edge after the last data in pair. A10 is Low with the Write command (Auto Precharge is disabled).
Don't Care
Integrated Silicon Solution, Inc. -- 1-800-379-4774
Rev. 00A 04/17/06
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37
IS43R16800A1
ISSI
Maximum DQSS
T1 T2 T3 T4 T5 T6
(R)
Write to Precharge: Interrupting (Burst Length = 4 or 8)
CK CK Command
Write NOP NOP NOP PRE NOP
tWR Address
BA a, COL b BA (a or all)
tDQSS (max) DQS DQ DM
DI a-b
2
tRP
3
3
1
1
Minimum DQSS
T1 CK CK Command
Write NOP NOP NOP PRE NOP
T2
T3
T4
T5
T6
tWR Address
BA a, COL b BA (a or all)
tDQSS (min) DQS DQ DM
DI a-b
2
tRP
3
3
1
1
DI a-b = data in for bank a, column b. An interrupted burst is shown, 2 data elements are written. 1 subsequent element of data in is applied in the programmed order following DI a-b. tWR is referenced from the first positive CK edge after the last desired data in pair. The Precharge command masks the last 2 data elements in the burst, for burst length = 8. A10 is Low with the Write command (Auto Precharge is disabled). 1 = Can be don't care for programmed burst length of 4. 2 = For programmed burst length of 4, DQS becomes don't care at this point. 3 = These bits are incorrectly written into the memory array if DM is low.
Don't Care
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IS43R16800A1
ISSI
T1 T2 T3 T4 T5 T6
(R)
Write to Precharge: Minimum DQSS, Odd Number of Data (1 bit Write), Interrupting (Burst Length = 4 or 8)
CK CK Command
Write NOP NOP NOP PRE NOP
tWR Address
BA a, COL b BA (a or all)
tDQSS (min) DQS DQ DM
DI a-b
2
tRP
3
4
4
1
1
DI a-b = data in for bank a, column b. An interrupted burst is shown, 1 data element is written. tWR is referenced from the first positive CK edge after the last desired data in pair. The Precharge command masks the last 2 data elements in the burst. A10 is Low with the Write command (Auto Precharge is disabled). 1 = Can be don't care for programmed burst length of 4. 2 = For programmed burst length of 4, DQS becomes don't care at this point. 3 = This bit is correctly written into the memory array if DM is low. 4 = These bits are incorrectly written into the memory array if DM is low.
Don't Care
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39
IS43R16800A1
ISSI
T1 T2 T3 T4 T5 T6
(R)
Write to Precharge: Nominal DQSS (2 bit Write), Interrupting (Burst Length = 4 or 8)
CK CK Command
Write NOP NOP NOP PRE NOP
tWR Address
BA a, COL b BA (a or all)
tDQSS (nom) DQS DQ DM
DI a-b
2
tRP
3
3
1
1
DI a-b = Data In for bank a, column b. An interrupted burst is shown, 2 data elements are written. 1 subsequent element of data in is applied in the programmed order following DI a-b. tWR is referenced from the first positive CK edge after the last desired data in pair. The Precharge command masks the last 2 data elements in the burst. A10 is Low with the Write command (Auto Precharge is disabled). 1 = Can be don't care for programmed burst length of 4. 2 = For programmed burst length of 4, DQS becomes don't care at this point. 3 = These bits are incorrectly written into the memory array if DM is low.
Don't Care
40
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IS43R16800A1
Precharge Command
CK CK CKE CS RAS CAS WE A0-A9, A11 All Banks A10 BA0, BA1 One Bank BA BA = bank address (if A10 is Low, otherwise Don't Care). Don't Care HIGH
ISSI
(R)
Precharge The Precharge command is used to deactivate the open row in a particular bank or the open row in all banks. The bank(s) is available for a subsequent row access some specified time (tRP) after the Precharge command is issued. Input A10 determines whether one or all banks are to be precharged, and in the case where only one bank is to be precharged, inputs BA0, BA1 select the bank. When all banks are to be precharged, inputs BA0, BA1 are treated as "Don't Care." Once a bank has been precharged, it is in the idle state and must be activated prior to any Read or Write commands being issued to that bank.
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IS43R16800A1
Power Down
ISSI
(R)
Power Down is entered when CKE is registered low (no accesses can be in progress). If Power Down occurs when all banks are idle, this mode is referred to as Precharge Power Down; if Power Down occurs when there is a row active in any bank, this mode is referred to as Active Power Down. Entering Power Down deactivates the input and output buffers, excluding CK, CK and CKE. The DLL is still running in Power Down mode, so for maximum power savings, the user has the option of disabling the DLL prior to entering Power Down. In that case, the DLL must be enabled after exiting Power Down, and 200 clock cycles must occur before a Read command can be issued. In Power Down mode, CKE Low and a stable clock signal must be maintained at the inputs of the DDR SDRAM, and all other input signals are "Don't Care". However, Power Down duration is limited by the refresh requirements of the device, so in most applications, the self refresh mode is preferred over the DLL-disabled Power Down mode. The Power Down state is synchronously exited when CKE is registered high (along with a Nop or Deselect command). A valid, executable command may be applied one clock cycle later.
Power Down
CK CK CKE tIS tIS
Command
VALID No column access in progress
NOP
NOP Exit power down mode tPDEX
VALID
Enter Power Down mode (Burst Read or Write operation must not be in progress)
Don't Care
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Integrated Silicon Solution, Inc. -- 1-800-379-4774
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IS43R16800A1
Truth Table 2: Clock Enable (CKE)
1. 2. 3. 4. CKE n is the logic state of CKE at clock edge n: CKE n-1 was the state of CKE at the previous clock edge. Current state is the state of the DDR SDRAM immediately prior to clock edge n. Command n is the command registered at clock edge n, and action n is a result of command n. All states and sequences not shown are illegal or reserved.
CKE n-1 Current State Previous Cycle L L L L H H H H CKEn Current Cycle L H L H L L L H Command n Action n
ISSI
(R)
Notes
Self Refresh Self Refresh Power Down Power Down All Banks Idle All Banks Idle Bank(s) Active
X Deselect or NOP X Deselect or NOP Deselect or NOP Auto Refresh Deselect or NOP See "Truth Table 3: Current State Bank n - Command to Bank n (Same Bank)"
Maintain Self-Refresh Exit Self-Refresh Maintain Power Down Exit Power Down Precharge Power Down Entry Self Refresh Entry Active Power Down Entry 1
1. Deselect or NOP commands should be issued on any clock edges occurring during the Self Refresh Exit (tXSNR) period. A minimum of 200 clock cycles are needed before applying a read command to allow the DLL to lock to the input clock.
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IS43R16800A1
ISSI
RAS X H L L L H H L H L H H H L CAS X H H L L L L H L H H L L H WE X H H H L H L L H L L H L L Command Deselect No Operation Active Auto Refresh Mode Register Set Read Write Precharge Read Precharge Burst Terminate Read Write Precharge Select column and start Read burst Select column and start Write burst Deactivate row in bank(s) Select column and start new Read burst Truncate Read burst, start Precharge Burst Terminate Select column and start Read burst Select column and start Write burst Truncate Write burst, start Precharge Action NOP. Continue previous operation NOP. Continue previous operation Select and activate row Notes 1-6 1-6 1-6 1-7 1-7 1-6, 10 1-6, 10 1-6, 8 1-6, 10 1-6, 8 1-6, 9 1-6, 10, 11 1-6, 10 1-6, 8, 11
(R)
Truth Table 3: Current State Bank n - Command to Bank n (Same Bank)
Current State Any L L Idle L L L Row Active L L Read (Auto Precharge Disabled) L L L L L L CS H
Write (Auto Precharge Disabled)
1. This table applies when CKE n-1 was high and CKE n is high (see Truth Table 2: Clock Enable (CKE) and after tXSNR / tXSRD has been met (if the previous state was self refresh). 2. This table is bank-specific, except where noted, i.e., the current state is for a specific bank and the commands shown are those allowed to be issued to that bank when in that state. Exceptions are covered in the notes below. 3. Current state definitions: Idle: The bank has been precharged, and tRP has been met. Row Active: A row in the bank has been activated, and tRCD has been met. No data bursts/accesses and no register accesses are in progress. Read: A Read burst has been initiated, with Auto Precharge disabled, and has not yet terminated or been terminated. Write: A Write burst has been initiated, with Auto Precharge disabled, and has not yet terminated or been terminated. 4. The following states must not be interrupted by a command issued to the same bank. Precharging: Starts with registration of a Precharge command and ends when tRP is met. Once tRP is met, the bank is in the idle state. Row Activating: Starts with registration of an Active command and ends when tRCD is met. Once tRCD is met, the bank is in the "row active" state. Read w/Auto Precharge Enabled: Starts with registration of a Read command with Auto Precharge enabled and ends when tRP has been met. Once tRP is met, the bank is in the idle state. Write w/Auto Precharge Enabled: Starts with registration of a Write command with Auto Precharge enabled and ends when tRP has been met. Once tRP is met, the bank is in the idle state. Deselect or NOP commands, or allowable commands to the other bank should be issued on any clock edge occurring during these states. Allowable commands to the other bank are determined by its current state and according to Truth Table 4. 5. The following states must not be interrupted by any executable command; Deselect or NOP commands must be applied on each positive clock edge during these states. Refreshing: Starts with registration of an Auto Refresh command and ends when tRFC is met. Once tRFC is met, the DDR SDRAM is in the "all banks idle" state. Accessing Mode Register: Starts with registration of a Mode Register Set command and ends when tMRD has been met. Once tMRD is met, the DDR SDRAM is in the "all banks idle" state. Precharging All: Starts with registration of a Precharge All command and ends when tRP is met. Once tRP is met, all banks is in the idle state. 6. All states and sequences not shown are illegal or reserved. 7. Not bank-specific; requires that all banks are idle. 8. May or may not be bank-specific; if all/any banks are to be precharged, all/any must be in a valid state for precharging. 9. Not bank-specific; Burst terminate affects the most recent Read burst, regardless of bank. 10. Reads or Writes listed in the Command/Action column include Reads or Writes with Auto Precharge enabled and Reads or Writes with Auto Precharge disabled. 11. Requires appropriate DM masking.
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IS43R16800A1
Truth Table 4: Current State Bank n - Command to Bank m (Different bank)
(Part 1 of 2)
Current State Any L Idle X L Row Activating, Active, or Precharging L L L Read (Auto Precharge Disabled) L L L L Write (Auto Precharge Disabled) L L L H X L H H L L H L L H H L H X H L L H H L H H L L H H X H H L L H H L H H L L No Operation Any Command Otherwise Allowed to Bank m Active Read Write Precharge Active Read Precharge Active Read Write Precharge Select and activate row Select column and start Read burst Select column and start new Write burst Select and activate row Select column and start new Read burst Select and activate row Select column and start Read burst Select column and start Write burst NOP/continue previous operation CS H RAS X CAS X WE X Command Deselect Action NOP/continue previous operation
ISSI
Notes 1-6 1-6 1-6 1-6 1-7 1-7 1-6 1-6 1-7 1-6 1-6 1-8 1-7 1-6
(R)
1. This table applies when CKE n-1 was high and CKE n is high (see Truth Table 2: Clock Enable (CKE) and after tXSNR / tXSRD has been met (if the previous state was self refresh). 2. This table describes alternate bank operation, except where noted, i.e., the current state is for bank n and the commands shown are those allowed to be issued to bank m (assuming that bank m is in such a state that the given command is allowable). Exceptions are covered in the notes below. 3. Current state definitions: Idle: The bank has been precharged, and tRP has been met. Row Active: A row in the bank has been activated, and tRCD has been met. No data bursts/accesses and no register accesses are in progress. Read: A Read burst has been initiated, with Auto Precharge disabled, and has not yet terminated or been terminated. Write: A Write burst has been initiated, with Auto Precharge disabled, and has not yet terminated or been terminated. Read with Auto Precharge Enabled: See note 10. Write with Auto Precharge Enabled: See note 10. 4. Auto Refresh and Mode Register Set commands may only be issued when all banks are idle. 5. A Burst Terminate command cannot be issued to another bank; it applies to the bank represented by the current state only. 6. All states and sequences not shown are illegal or reserved. 7. Reads or Writes listed in the Command/Action column include Reads or Writes with Auto Precharge enabled and Reads or Writes with Auto Precharge disabled. 8. Requires appropriate DM masking. 9. A Write command may be applied after the completion of data output. 10. The Read with Auto Precharge enabled or Write with Auto Precharge enabled states can each be broken into two parts: the access period and the precharge period. For Read with Auto Precharge, the precharge period is defined as if the same burst was executed with Auto Precharge disabled and then followed with the earliest possible Precharge command that still accesses all of the data in the burst. For Write with Auto Precharge, the precharge period begins when tWR ends, with tWR measured as if Auto Precharge was disabled. The access period starts with registration of the command and ends where the precharge period (or tRP) begins. During the precharge period of the Read with Auto Precharge Enabled or Write with Auto Precharge Enabled states, Active, Precharge, Read, and Write commands to the other bank may be applied; during the access period, only Active and Precharge commands to the other bank may be applied. In either case, all other related limitations apply (e.g. contention between Read data and Write data must be avoided).
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IS43R16800A1
Truth Table 4: Current State Bank n - Command to Bank m (Different bank)
(Part 2 of 2)
Current State CS L Read (With Auto Precharge) L L L L Write (With Auto Precharge) L L L RAS L H H L L H H L CAS H L L H H L L H WE H H L L H H L L Command Active Read Write Precharge Active Read Write Precharge Select and activate row Select column and start Read burst Select column and start new Write burst Action Select and activate row Select column and start new Read burst Select column and start Write burst
ISSI
Notes 1-6 1-7,10 1-7,9,10 1-6 1-6 1-7,10 1-7,10 1-6
(R)
1. This table applies when CKE n-1 was high and CKE n is high (see Truth Table 2: Clock Enable (CKE) and after tXSNR / tXSRD has been met (if the previous state was self refresh). 2. This table describes alternate bank operation, except where noted, i.e., the current state is for bank n and the commands shown are those allowed to be issued to bank m (assuming that bank m is in such a state that the given command is allowable). Exceptions are covered in the notes below. 3. Current state definitions: Idle: The bank has been precharged, and tRP has been met. Row Active: A row in the bank has been activated, and tRCD has been met. No data bursts/accesses and no register accesses are in progress. Read: A Read burst has been initiated, with Auto Precharge disabled, and has not yet terminated or been terminated. Write: A Write burst has been initiated, with Auto Precharge disabled, and has not yet terminated or been terminated. Read with Auto Precharge Enabled: See note 10. Write with Auto Precharge Enabled: See note 10. 4. Auto Refresh and Mode Register Set commands may only be issued when all banks are idle. 5. A Burst Terminate command cannot be issued to another bank; it applies to the bank represented by the current state only. 6. All states and sequences not shown are illegal or reserved. 7. Reads or Writes listed in the Command/Action column include Reads or Writes with Auto Precharge enabled and Reads or Writes with Auto Precharge disabled. 8. Requires appropriate DM masking. 9. A Write command may be applied after the completion of data output. 10. The Read with Auto Precharge enabled or Write with Auto Precharge enabled states can each be broken into two parts: the access period and the precharge period. For Read with Auto Precharge, the precharge period is defined as if the same burst was executed with Auto Precharge disabled and then followed with the earliest possible Precharge command that still accesses all of the data in the burst. For Write with Auto Precharge, the precharge period begins when tWR ends, with tWR measured as if Auto Precharge was disabled. The access period starts with registration of the command and ends where the precharge period (or tRP) begins. During the precharge period of the Read with Auto Precharge Enabled or Write with Auto Precharge Enabled states, Active, Precharge, Read, and Write commands to the other bank may be applied; during the access period, only Active and Precharge commands to the other bank may be applied. In either case, all other related limitations apply (e.g. contention between Read data and Write data must be avoided).
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IS43R16800A1
Simplified State Diagram
Power Applied Power On
ISSI
(R)
Precharge Preall
Self Refresh REFS REFSX
MRS EMRS
MRS
Idle
REFA
Auto Refresh
CKEL CKEH
Active Power Down CKEH CKEL
ACT
Precharge Power Down
Write Write A Write
Row Active
Burst Stop Read
Read A Read Read
Write A Read A Write A PRE PRE PRE
Read A
Read A
PRE
Precharge Preall Automatic Sequence Command Sequence
PREALL = Precharge All Banks MRS = Mode Register Set EMRS = Extended Mode Register Set REFS = Enter Self Refresh REFSX = Exit Self Refresh REFA = Auto Refresh
CKEL = Enter Power Down CKEH = Exit Power Down ACT = Active Write A = Write with Autoprecharge Read A = Read with Autoprecharge PRE = Precharge
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IS43R16800A1
ISSI
Parameter Rating Units V V V V
(R)
Absolute Maximum Ratings
Symbol VIN, VOUT VIN VDD VDDQ TA TSTG PD IOUT Voltage on I/O pins relative to VSS Voltage on Inputs relative to VSS Voltage on VDD supply relative to VSS Voltage on VDDQ supply relative to VSS Operating Temperature (Ambient) Storage Temperature (Plastic) Power Dissipation Short Circuit Output Current
-0.5 to VDDQ+ 0.5 -0.5 to +3.6 -0.5 to +3.6 -0.5 to +3.6
0 to +70
C C
W mA
-55 to +150
1.0 50
Note: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only, and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
DQS/DQ/DM Slew Rate
Parameter Symbol DDR266 (-75) Min DCS/DQ/DM input slew rate DCSLEW Max DDR333 (-6) Min Max DDR400 (-5) Min Max DDR466 (-43) Min 0.5 Max 4.0 V/ns 1, 2 Unit Notes
1. Measured between V IH (DC), V IL (DC), and V IL (DC), V IH (DC). 2. DQS, DQ, and DM input slew rate is specified to prevent double clocking of data and preserve setup and hold times. Signal transition through the DC region must be monotonic.
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IS43R16800A1
Capacitance
Parameter Input Capacitance: CK, CK Delta Input Capacitance: CK, CK Input Capacitance: All other input-only pins (except DM) Delta Input Capacitance: All other input-only pins (except DM) Input/Output Capacitance: DQ, DQS, DM Delta Input/Output Capacitance: DQ, DQS, DM Symbol CI1 delta CI1 CI2 delta CI2 CIO delta CIO 4.0 2.0 Min. 2.0 Max. 3.0 0.25 3.0 0.5 5.0 0.5 Units pF pF pF pF pF pF
ISSI
Notes 1 1 1 1 1, 2 1
(R)
1. VDDQ = VDD = 2.5V 0.2V (minimum range to maximum range), f = 100MHz, TA = 25C, VODC = VDDQ/2, VOPeak -Peak = 0.2V. 2. Although DM is an input-only pin, the input capacitance of this pin must model the input capacitance of the DQ and DQS pins. This is required to match input propagation times of DQ, DQS and DM in the system.
DC Electrical Characteristics and Operating Conditions
(0C TA 70xC; VDDQ = 2.5V 0.2V, VDD = + 2.5V 0.2V, see AC Characteristics)
Symbol VDD VDDQ VSS, VSSQ VREF VTT VIH(DC) VIL(DC) VIN(DC) VID(DC) VIX(DC) VIRatio II IOZ IOH IOL Supply Voltage I/O Supply Voltage Supply Voltage I/O Supply Voltage I/O Reference Voltage I/O Termination Voltage (System) Input High (Logic1) Voltage Input Low (Logic0) Voltage Input Voltage Level, CK and CK Inputs Input Differential Voltage, CK and CK Inputs Input Crossing Point Voltage, CK and CK Inputs V-I Matching Pullup Current to Pulldown Current Ratio Input Leakage Current Any input 0V VIN VDD; (All other pins not under test = 0V) Output Leakage Current (DQs are disabled; 0V Vout VDDQ Output Current: Nominal Strength Driver High current (VOUT= VDDQ -0.373V, min VREF, min VTT) Low current (VOUT= 0.373V, max VREF, max VTT) Parameter Min 2.3 2.3 0 0.49 x VDDQ VREF - 0.04 VREF + 0.15 - 0.3 - 0.3 0.30 0.30 0.71 -5 -5 - 16.8 mA 16.8 1 Max 2.7 2.7 0 0.51 x VDDQ VREF + 0.04 VDDQ + 0.3 VREF - 0.15 VDDQ + 0.3 VDDQ + 0.6 VDDQ + 0.6 1.4 5 5 A A Units V V V V V V V V V V 1, 2 1, 3 1 1 1 1, 4 1, 4 5 1 1 Notes 1 1
1. Inputs are not recognized as valid until VREF stabilizes. 2. VREF is expected to be equal to 0.5 VDDQ of the transmitting device, and to track variations in the DC level of the same. Peak-to-peak noise on VREF may not exceed 2% of the DC value. 3. VTT is not applied directly to the device. VTT is a system supply for signal termination resistors, is expected to be set equal to VREF, and must track variations in the DC level of VREF. 4. VID is the magnitude of the difference between the input level on CK and the input level on CK. 5. The ratio of the pullup current to the pulldown current is specified for the same temperature and voltage, over the entire temperature and voltage range, for device drain to source voltages for 0.25 volts to 1.0 volts. For a given output, it represents the maximum difference between pullup and pulldown drivers due to process variation.
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IS43R16800A1
DC Electrical Characteristics and Operating Conditions
(0C TA 70xC; VDDQ = 2.5V 0.2V, VDD = + 2.5V 0.2V, see AC Characteristics)
Symbol IOHW IOLW Parameter Output Current: Half- Strength Driver High current (VOUT= VDDQ -0.763V, min VREF, min VTT) Low current (VOUT= 0.763V, max VREF, max VTT) Min - 9.0 Max
ISSI
Units mA 9.0 Notes 1
(R)
1. Inputs are not recognized as valid until VREF stabilizes. 2. VREF is expected to be equal to 0.5 VDDQ of the transmitting device, and to track variations in the DC level of the same. Peak-to-peak noise on VREF may not exceed 2% of the DC value. 3. VTT is not applied directly to the device. VTT is a system supply for signal termination resistors, is expected to be set equal to VREF, and must track variations in the DC level of VREF. 4. VID is the magnitude of the difference between the input level on CK and the input level on CK. 5. The ratio of the pullup current to the pulldown current is specified for the same temperature and voltage, over the entire temperature and voltage range, for device drain to source voltages for 0.25 volts to 1.0 volts. For a given output, it represents the maximum difference between pullup and pulldown drivers due to process variation.
Normal Strength Driver Pulldown and Pullup Characteristics
1. The full variation in driver pulldown current from minimum to maximum process, temperature and voltage will lie within the outer bounding lines of the V-I curve. 2. It is recommended that the "typical" IBIS pulldown V-I curve lie within the shaded region of the V-I curve.
Normal Strength Driver Pulldown Characteristics
140 Maximum
IOUT (mA)
Typical High Typical Low Minimum
0
0 VOUT (V)
2.7
3. The full variation in driver pullup current from minimum to maximum process, temperature and voltage will lie within the outer bounding lines of the V-I curve. 4. It is recommended that the "typical" IBIS pullup V-I curve lie within the shaded region of the V-I curve.
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Integrated Silicon Solution, Inc. -- 1-800-379-4774
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IS43R16800A1
Normal Strength Driver Pullup Characteristics
0 Minimum IOUT (mA) Typical Low
ISSI
(R)
Typical High -200 0 VOUT (V)
5. The full variation in the ratio of the maximum to minimum pullup and pulldown current will not exceed 1.7, for device drain to source voltages from 0.1 to 1.0. 6. The full variation in the ratio of the "typical" IBIS pullup to "typical" IBIS pulldown current should be unity + 10%, for device drain to source voltages from 0.1 to 1.0. This specification is a design objective only. It is not guaranteed. 7. These characteristics are intended to obey the SSTL_2 class II standard. 8. This specification is intended for DDR SDRAM only.
Maximum 2.7
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IS43R16800A1
Normal Strength Driver Pulldown and Pullup Currents
Pulldown Current (mA) Voltage (V) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Typical Low 6.0 12.2 18.1 24.1 29.8 34.6 39.4 43.7 47.5 51.3 54.1 56.2 57.9 59.3 60.1 60.5 61.0 61.5 62.0 62.5 62.9 63.3 63.8 64.1 64.6 64.8 65.0 Typical High 6.8 13.5 20.1 26.6 33.0 39.1 44.2 49.8 55.2 60.3 65.2 69.9 74.2 78.4 82.3 85.9 89.1 92.2 95.3 97.2 99.1 100.9 101.9 102.8 103.8 104.6 105.4 Min 4.6 9.2 13.8 18.4 23.0 27.7 32.2 36.8 39.6 42.6 44.8 46.2 47.1 47.4 47.7 48.0 48.4 48.9 49.1 49.4 49.6 49.8 49.9 50.0 50.2 50.4 50.5 Max 9.6 18.2 26.0 33.9 41.8 49.4 56.8 63.2 69.9 76.3 82.5 88.3 93.8 99.1 103.8 108.4 112.1 115.9 119.6 123.3 126.5 129.5 132.4 135.0 137.3 139.2 140.8 Typical Low -6.1 -12.2 -18.1 -24.0 -29.8 -34.3 -38.1 -41.1 -43.8 -46.0 -47.8 -49.2 -50.0 -50.5 -50.7 -51.0 -51.1 -51.3 -51.5 -51.6 -51.8 -52.0 -52.2 -52.3 -52.5 -52.7 -52.8 Pullup Current (mA) Typical High -7.6 -14.5 -21.2 -27.7 -34.1 -40.5 -46.9 -53.1 -59.4 -65.5 -71.6 -77.6 -83.6 -89.7 -95.5 -101.3 -107.1 -112.4 -118.7 -124.0 -129.3 -134.6 -139.9 -145.2 -150.5 -155.3 -160.1 Min -4.6 -9.2 -13.8 -18.4 -23.0 -27.7 -32.2 -36.0 -38.2 -38.7 -39.0 -39.2 -39.4 -39.6 -39.9 -40.1 -40.2 -40.3 -40.4 -40.5 -40.6 -40.7 -40.8 -40.9 -41.0 -41.1 -41.2
ISSI
Max -10.0 -20.0 -29.8 -38.8 -46.8 -54.4 -61.8 -69.5 -77.3 -85.2 -93.0 -100.6 -108.1 -115.5 -123.0 -130.4 -136.7 -144.2 -150.5 -156.9 -163.2 -169.6 -176.0 -181.3 -187.6 -192.9 -198.2
(R)
Normal Strength Driver Evaluation Conditions
Typical Temperature (Tambient) VDDQ Process conditions 25 C 2.5V typical process Minimum 70 C 2.3V slow-slow process Maximum 0 C 2.7V fast-fast process
52
N
Integrated Silicon Solution, Inc. -- 1-800-379-4774
(c)
Rev. 00A 04/17/06
IS43R16800A1
AC Characteristics
ISSI
(R)
(Notes 1-5 apply to the following Tables; Electrical Characteristics and DC Operating Conditions, AC Operating Conditions, IDD Specifications and Conditions, and Electrical Characteristics and AC Timing.) 1. All voltages referenced to VSS. 2. Tests for AC timing, IDD, and electrical, AC and DC characteristics, may be conducted at nominal reference/supply voltage levels, but the related specifications and device operation are guaranteed for the full voltage range specified. 3. Outputs measured with equivalent load. Refer to the AC Output Load Circuit below. 4. AC timing and IDD tests may use a VIL to VIH swing of up to 1.5V in the test environment, but input timing is still referenced to VREF (or to the crossing point for CK, CK), and parameter specifications are guaranteed for the specified AC input levels under normal use conditions. The minimum slew rate for the input signals is 1V/ns in the range between VIL(AC) and VIH(AC). 5. The AC and DC input level specifications are as defined in the SSTL_2 Standard (i.e. the receiver effectively switches as a result of the signal crossing the AC input level, and remains in that state as long as the signal does not ring back above (below) the DC input low (high) level.
AC Output Load Circuit Diagrams
VTT
50 Output (VOUT) Timing Reference Point
30pF
Integrated Silicon Solution, Inc. -- 1-800-379-4774
Rev. 00A 04/17/06
(c)
N
53
IS43R16800A1
ISSI
Parameter/Condition Min VREF + 0.31 VREF - 0.31 0.62 0.5*VDDQ - 0.2 VDDQ + 0.6 0.5*VDDQ + 0.2 Max Unit V V V V Notes 1, 2 1, 2 1, 2, 3 1, 2, 4
(R)
AC Input Operating Conditions
(0 C TA 70 C; VDD = VDDQ = 2.5V 0.2V (-6/-75); VDD = VDDQ = 2.6V 0.1V (-5/-43), See AC Characteristics)
Symbol VIH(AC) VIL(AC) VID(AC) VIX(AC) 1. 2. 3. 4.
Input High (Logic 1) Voltage, DQ, DQS, and DM Signals Input Low (Logic 0) Voltage, DQ, DQS, and DM Signals Input Differential Voltage, CK and CK Inputs Input Crossing Point Voltage, CK and CK Inputs
Input slew rate = 1V/ns. Inputs are not recognized as valid until VREF stabilizes. VID is the magnitude of the difference between the input level on CK and the input level on CK. The value of VIX is expected to equal 0.5*VDDQ of the transmitting device and must track variations in the DC level of the same.
IDD Specifications and Conditions
(0 C TA 70 C; VDD = VDDQ = 2.5V 0.2V(-6/-75); VDD = VDDQ = 2.6V 0.1V (-5/-43), See AC Characteristics)
Symbol Parameter/Condition Operating Current: one bank; active / precharge; tRC = tRC (min); DQ, DM, and DQS inputs changing twice per clock cycle; address and control inputs changing once per clock cycle Operating Current: one bank; active / read / precharge; Burst = 2; tRC = tRC (min); CL = 2.5; IOUT = 0mA; address and control inputs changing once per clock cycle Precharge Power Down Standby Current: all banks idle; Power Down mode; CKE VIL (max) Idle Standby Current: CS VIH (min); all banks idle; CKE VIH (min); address and control inputs changing once per clock cycle Active Power Down Standby Current: one bank active; Power Down mode; CKE VIL (max) Active Standby Current: one bank; active / precharge; CS VIH (min); CKE VIH (min); tRC = tRAS (max); DQ, DM, and DQS inputs changing twice per clock cycle; address and control inputs changing once per clock cycle Operating Current: one bank; Burst = 2; reads; continuous burst; address and control inputs changing once per clock cycle; DQ and DQS outputs changing twice per clock cycle; CL = 2.5; IOUT = 0mA DDR266 (-75) tCK=6ns DDR333 DDR400 DDR466 (-6) (-5) (-43) tCK=6ns tCK=5.0ns tCK=4.3ns 180 Unit Notes
IDD0
mA
1
IDD1
210
mA
1
IDD2P IDD2N
3.5 65
mA mA
1 1
IDD3P
65
mA
1
IDD3N
140
mA
1
IDD4R
300
mA
1
Operating Current: one bank; Burst = 2; writes; continuous burst; IDD4W address and control inputs changing once per clock cycle; DQ and DQS inputs changing twice per clock cycle; CL = 2.5 IDD5 IDD6 Auto-Refresh Current: tRC = tRFC (min) Self-Refresh Current: CKE 0.2V Operating current: four bank; four bank interleaving with BL = 4, address and control inputs randomly changing; 50% of data changing at every transfer; t RC = t RC (min); I OUT = 0mA.
290 240 4
mA mA mA
1 1 1, 2
IDD7
430
mA
1
1. IDD specifications are tested after the device is properly initialized. 2. Enables on-chip refresh and address counters.
54
N
Integrated Silicon Solution, Inc. -- 1-800-379-4774
(c)
Rev. 00A 04/17/06
IS43R16800A1
Electrical Characteristics & AC Timing - Absolute Specifications
ISSI
DDR266 -75 Min Max DDR333 -6 Min Max DDR400 -5 Min Max DDR466 -43 Min Max + 0.6 + 0.5 0.55 0.55 10 8.6 ns ns ns ns + 0.6 + 0.6 + 0.4 min (tCL, tCH) tHP tQHS 0.5 0.72 0.35 0.35 0.2 0.2 2 0 0.60 0.40 0.25 0.6 0.6 0.60 1.28 0.72 0.35 0.35 0.2 0.2 2 0 0.40 0.25 0.6 0.6 0.60 0.5 1.28 ns ns ns 1-4, 15, 16 1-4, 15, 16 2-4, 12 1-4 1-4, 5 1-4, 5 1-4 ns 1-4 ns ns tCK tCK 1-4 1-4 1-4 1-4 Unit Notes
(R)
(0 C TA 70 C; VDD = VDDQ = 2.5V 0.2V (-6/-75); VDD = VDDQ = 2.6V 0.1V (-5/-43), See AC Characteristics) (Part 1 of 2)
Symbol
Parameter
tAC
DQ output access time from CK/CK
- 0.75 + 0.75 - 0.70 + 0.70 - 0.65 + 0.65 - 0.6 - 0.75 + 0.75 - 0.60 + 0.60 - 0.55 + 0.55 - 0.5 0.45 0.45 0.55 0.55 12 12 0.45 0.45 6 7.5 0.45 0.45 2.2 1.75 + 0.7 + 0.7 + 0.45 min (tCL, tCH) tHP tQHS 0.75 0.75 0.35 0.35 0.2 0.2 2 0 0.40 0.25 0.9 0.9 0.60 1.25 0.75 0.35 0.35 0.2 0.2 2 0 0.40 0.25 0.75 0.75 0.55 1.25 min (tCL, tCH) tHP tQHS 0.55 0.55 12 12 0.45 0.45 5 5 0.4 0.4 2.2 1.75 - 0.6 - 0.6 + 0.6 + 0.6 + 0.4 0.55 0.55 8 12 0.45 0.45 4 4.3 0.4 0.4 2.2 1.75 - 0.6 - 0.6
tDQSCK DQS output access time from CK/CK tCH tCL CK high-level width CK low-level width CL = 3 tCK Clock cycle time CL = 2.5 CL = 2.0 tDH tDS tIPW tDIPW tHZ tLZ tDQSQ DQ and DM input hold time DQ and DM input setup time Input pulse width DQ and DM input pulse width (each input) Data-out high-impedance time from CK/CK Data-out low-impedance time from CK/CK DQS-DQ skew (DQS & associated DQ signals) TSOP Package
7.5 10 0.5 0.5 2.2 1.75
- 0.75 + 0.75 - 0.7 - 0.75 + 0.75 - 0.7 + 0.5 min (tCL, tCH) tHP tQHS
tHP
Minimum half clk period for any given cycle; defined by clk high (tCH) or clk low (tCL) time Data output hold time from DQS Data hold Skew Factor TSOP Package
tCK
1-4
tQH tQHS tDQSS tDQSH tDQSL tDSS tDSH tMRD
tCK tCK tCK tCK tCK tCK tCK tCK ns tCK tCK ns ns
1-4 1-4 1-4 1-4 1-4 1-4 1-4 1-4 1-4, 7 1-4, 6 1-4 2-4, 9, 11, 12 2-4, 9, 11, 12
Write command to 1st DQS latching transition DQS input high pulse width (write cycle) DQS input low pulse width (write cycle) DQS falling edge to CK setup time (write cycle) DQS falling edge hold time from CK (write cycle) Mode register set command cycle time
tWPRES Write preamble setup time tWPST tWPRE tIH tIS Write postamble Write preamble Address and control input hold time (fast slew rate) Address and control input setup time (fast slew rate)
Integrated Silicon Solution, Inc. -- 1-800-379-4774
Rev. 00A 04/17/06
(c)
N
55
IS43R16800A1
Electrical Characteristics & AC Timing - Absolute Specifications
ISSI
Parameter DDR266 -75 Min Max DDR333 -6 Min 0.8 0.8 1.1 0.60 120,0 00 0.9 0.40 42 60 12 3 3 3 2 3 (tWR/t CK) + (tRP/tC K) 1 6 13 200 7.8 7.8 1.1 0.60 120,0 00 Max DDR400 -5 Min 0.7 0.7 0.9 0.40 40 60 13 3 3 3 2 3 (tWR/t CK) + (tRP/tC K) 1 5 10 200 7.8 1.1 0.60 120,0 00 Max DDR466 -43 Min 0.7 0.6 0.9 0.40 40 60 15 4 4 3 3 3 (tWR/t CK) + (tRP/tC K) 2 5 10 200 7.8 1.1 0.60 120,0 00 Max ns ns tCK tCK ns ns tCK tCK tCK tCK tCK tCK 2-4, 10, 11, 12, 14 2-4, 10, 11, 12, 14 1-4 1-4 1-4 1-4 1-4 1-4 1-4 1-4 1-4 1-4 Unit Notes
(R)
(0 C TA 70 C; VDD = VDDQ = 2.5V 0.2V (-6/-75); VDD = VDDQ = 2.6V 0.1V (-5/-43), See AC Characteristics) (Part 2 of 2)
Symbol
tIH tIS tRPRE tRPST tRAS tRC tRFC tRCD tRAP tRP tRRD tWR
Address and control input hold time (slow slew rate) Address and control input setup time (slow slew rate) Read preamble Read postamble Active to Precharge command Active to Active/Auto-refresh command period Auto-refresh to Active/Auto-refresh command period Active to Read or Write delay Active to Read Command with Autoprecharge Precharge command period Active bank A to Active bank B command Write recovery time
1.0 1.0 0.9 0.40 45 65 12 3 3 3 2 3 (tWR/t CK) + (tRP/tC K) 1 7.5 13 200
tDAL
Auto precharge write recovery + precharge time
tCK
1-4, 13
tWTR tPDEX tXSNR tXSRD tREFI
Internal write to read command delay Power down exit time Exit self-refresh to non-read command Exit self-refresh to read command Average Periodic Refresh Interval
tCK ns tCK tCK s
1-4 1-4 1-4 1-4 1-4, 8
1. Input slew rate = 1V/ns 2. The CK/CK input reference level (for timing reference to CK/CK) is the point at which CK and CK cross: the input reference level for signals other than CK/CK, is VREF. 3. Inputs are not recognized as valid until VREF stabilizes. 4. The Output timing reference level, as measured at the timing reference point indicated in AC Characteristics (Note 3) is VTT. 5. tHZ and tLZ transitions occur in the same access time windows as valid data transitions. These parameters are not referred to a specific voltage level, but specify when the device is no longer driving (HZ), or begins driving (LZ).
56
N
Integrated Silicon Solution, Inc. -- 1-800-379-4774
(c)
Rev. 00A 04/17/06
IS43R16800A1
Electrical Characteristics & AC Timing - Absolute Specifications Notes
ISSI
(R)
1. Input slew rate = 1V/ns. 2. The CK/CK input reference level (for timing reference to CK/CK) is the point at which CK and CK cross; the input reference level for signals other than CK/CK is VREF. 3. Inputs are not recognized as valid until VREF stabilizes. 4. The Output timing reference level, as measured at the timing reference point indicated in AC Characteristics (Note 3) is VTT. 5. tHZ and tLZ transitions occur in the same access time windows as valid data transitions. These parameters are not referred to a specific voltage level, but specify when the device is no longer driving (HZ), or begins driving (LZ). 6. The maximum limit for this parameter is not a device limit. The device operates with a greater value for this parameter, but system performance (bus turnaround) degrades accordingly. 7. The specific requirement is that DQS be valid (high, low, or some point on a valid transition) on or before this CK edge. A valid transition is defined as monotonic and meeting the input slew rate specifications of the device. When no writes were previously in progress on the bus, DQS will be transitioning from Hi-Z to logic LOW. If a previous write was in progress, DQS could be HIGH, LOW, or transitioning from high to low at this time, depending on tDQSS. 8. A maximum of eight Autorefresh commands can be posted to any given DDR SDRAM device. 9. For command/address input slew rate 1.0V/ns. Slew rate is measured between VOH (AC) and VOL (AC). 10. For command/address input slew rate 0.5V/ns and < 1.0V/ns. Slew rate is measured between VOH (AC) and VOL (AC). 11. CK/CK slew rates are 1.0V/ns. 12. These parameters guarantee device timing, but they are not necessarily tested on each device, and they may be guaranteed by design or tester characterization. 13. For each of the terms in parentheses, if not already an integer, round to the next highest integer. tCK is equal to the actual system clock cycle time. For example, for DDR266B at CL = 2.5, tDAL = (15ns/7.5ns) + (20ns/7.5ns) = 2 + 3 = 5.
Integrated Silicon Solution, Inc. -- 1-800-379-4774
Rev. 00A 04/17/06
N
(c)
57
IS43R16800A1
ISSI
delta (tIS) 0 +50 +100 delta (tIH) 0 0 0 Unit ps ps ps Notes 1,2 1,2 1,2
(R)
14. An input setup and hold time derating table is used to increase tIS and tIH in the case where the input slew rate is below 0.5 V/ns.
Input Slew Rate 0.5 V/ns 0.4 V/ns 0.3 V/ns
1. Input slew rate is based on the lesser of the slew rates determined by either V IH (AC) to V IL (AC) or V IH (DC) to V IL (DC), similarly for rising transitions. 2. These derating parameters may be guaranteed by design or tester characterization and are not necessarily tested on each device.
15. An input setup and hold time derating table is used to increase tDS and tDH in the case where the I/O slew rate is below 0.5 V/ns.
Input Slew Rate 0.5 V/ns 0.4 V/ns 0.3 V/ns delta (tDS) 0 +75 +150 delta (tDH) 0 +75 +150 Unit ps ps ps Notes 1,2 1,2 1,2
1. I/O slew rate is based on the lesser of the slew rates determined by either V IH (AC) to V IL (AC) or V IH (DC) to V IL (DC), similarly for rising transitions. 2. These derating parameters may be guaranteed by design or tester characterization and are not necessarily tested on each device.
16. An I/O Delta Rise, Fall Derating table is used to increase tDS and tDH in the case where DQ, DM, and DQS slew rates differ.
Input Slew Rate 0.0 V/ns 0.25 V/ns 0.5 V/ns delta (tDS) 0 +50 +100 delta (tDH) 0 +50 +100 Unit ps ps ps Notes 1,2,3,4 1,2,3,4 1,2,3,4
1. Input slew rate is based on the lesser of the slew rates determined by either V IH (AC) to V IL (AC) or V IH (DC) to V IL (DC), similarly for rising transitions. 2. Input slew rate is based on the larger of AC to AC delta rise, fall rate and DC to DC delta rise, fall rate. 3. The delta rise, fall rate is calculated as: [1/(slew rate 1)] - [1/(slew rate 2)] For example: slew rate 1 = 0.5 V/ns; slew rate 2 = 0.4 V/ns Delta rise, fall = (1/0.5) - (1/0.4) [ns/V] = -0.5 ns/V Using the table above, this would result in an increase in t DS and t DH of 100 ps. 4. These derating parameters may be guaranteed by design or tester characterization and are not necessarily tested on each device.
58
N
Integrated Silicon Solution, Inc. -- 1-800-379-4774
(c)
Rev. 00A 04/17/06
IS43R16800A1
Data Input (Write)
(Timing Burst Length = 4)
ISSI
tDSL tDSH
(R)
DQS tDH tDS DQ
DI n
tDH tDS DM
DI n = Data In for column n. 3 subsequent elements of data in are applied in programmed order following DI n.
Don't Care
Data Output (Read)
CK CK DQS tHP
(Timing Burst Length = 4)
tHP
tHP
tHP1
tHP2
tHP3
tHP4
tDQSQ tQH1 DQ tDQSQ
tQH2
tDQSQ tQH3
tQH4
tDQSQ
tHP is the half cycle pulse width for each half cycle clock. tHP is referenced to the clock duty cycle only and not to the data strobe (DQS) duty cycle. Data Output hold time from Data Strobe is shown as tQH. tQH is a function of the clock high or low time (tHP) for that given clock cycle. Note correlation of tHP to tQH in the diagram above (tHP1 to tQH1, etc.). tDQSQ (max) occurs when DQS is the earliest among DQS and DQ signals to transition.
Integrated Silicon Solution, Inc. -- 1-800-379-4774
Rev. 00A 04/17/06
(c)
N
59
60
* VTT is not applied directly to the device, however tVTD must be greater than or equal to zero to avoid device latchup. ** tMRD is required before any command can be applied and 200 cycles of CK are required before a Read command can be applied. The two Autorefresh commands may be moved to follow the first MRS, but precede the second Precharge All command.
tVTD tCK tCH
VDD
IS43R16800A1
VDDQ
VTT (System*)
VREF
200 cycles of CK**
tCL tMRD tMRD tRP tRFC tRFC tMRD
200s
Initialize and Mode Register Sets
CK CK
tIH tIS
CKE
tIH tIS NOP PRE EMRS MRS PRE AR AR
LVCMOS LOW LEVEL
Command
MRS
ACT
N
DM
tIH tIS CODE tIH tIS CODE CODE tIS tIH tIS CODE RA CODE tIH CODE RA
A0-A9, A11
A10
ALL BANKS
tIH tIS BA0=H BA1=L
Integrated Silicon Solution, Inc. -- 1-800-379-4774
ALL BANKS
BA0=L BA1=L
(c) Power-up: VDD and CK stable
BA0, BA1
BA0=L BA1=L
BA
High-Z
DQS
High-Z
DQ
ISSI
Don't Care
Extended Mode Register Set
Load Mode Register, Reset DLL
Load Mode Register (with A8 = L)
(R)
Rev. 00A 04/17/06
Power Down Mode
Rev. 00A 04/17/06
IS43R16800A1
CK
tCK
tCH
tCL
tPDEX
CK tIH tIS tIS tIS
CKE tIH tIS VALID* tIH tIS VALID VALID NOP NOP VALID
Integrated Silicon Solution, Inc. -- 1-800-379-4774
Enter Power Down Mode
Command
ADDR
N
DQS
DQ
DM
(c)
Exit Power Down Mode
No column accesses are allowed to be in progress at the time power down is entered. * = If this command is a Precharge (or if the device is already in the idle state) then the power down mode shown is Precharge power down. If this command is an Active (or if at least one row is already active), then the power down mode shown is Active power down.
Don't Care
ISSI
61
(R)
62
tRP tCH tCK tRFC tRFC tCL
IS43R16800A1
Auto Refresh Mode
CK CK
tIH tIS VALID VALID
CKE
tIH tIS NOP PRE NOP NOP AR NOP AR NOP NOP
Command
ACT
A0-A8
RA
A9, A11
ALL BANKS
RA
N
A10
ONE BANK
tIH tIS BANK(S)
RA
BA0, BA1
BA
DQS
Integrated Silicon Solution, Inc. -- 1-800-379-4774
(c)
DQ
DM
PRE = Precharge; ACT = Active; RA = Row address; BA = Bank address; AR = Autorefresh. NOP commands are shown for ease of illustration; other valid commands may be possible at these times. DM, DQ, and DQS signals are all don't care/high-Z for operations shown.
ISSI
Don't Care
(R)
Rev. 00A 04/17/06
Self Refresh Mode
Rev. 00A 04/17/06
Clock must be stable before exiting Self Refresh Mode
tRP* tCK tCH tCL
IS43R16800A1
200 cycles
CK CK
tIH tIS tIS tIS
CKE
tIH tIS NOP AR tXSRD, tXSRN NOP VALID
Integrated Silicon Solution, Inc. -- 1-800-379-4774
tIH tIS VALID
Command
ADDR
N
DQS
DQ
DM
(c)
Enter Self Refresh Mode
Exit Self Refresh Mode
* = Device must be in the all banks idle state before entering Self Refresh Mode. ** = tXSNR is required before any non-read command can be applied, and tXSRD (200 cycles of CK). are required before a Read command can be applied.
Don't Care
ISSI
63
(R)
64
tCK tCL tCH tRP
CK CK
tIH tIS tIH VALID tIH tIS VALID VALID
IS43R16800A1
CKE
Command
tIH tIS
NOP NOP PRE NOP NOP ACT NOP NOP
Read
NOP
A0-A9, A11
COL n
RA tIH tIS
ALL BANKS
RA
A10
DIS AP ONE BANK
tIH tIS
BA0, BA1 DM
tLZ (min) tRPRE
BA x
BA x*
BA x
Read without Auto Precharge (Burst Length = 4)
N
DQS
tAC (min) tHZ (min) tRPST tDQSCK (min)
Case 1: tAC/tDQSCK = min
CL=2
DQ
DO n
tLZ (max) tRPRE
(c) DQS DQ
Case 2: tAC/tDQSCK = max
tAC (max) tLZ (max)
tHZ (max) tRPST tDQSCK (max)
DO n
DO n = data out from column n.
3 subsequent elements of data out are provided in the programmed order following DO n.
DIS AP = Disable Auto Precharge. * = Don't care if A10 is High at this point. PRE = Precharge; ACT = Active; RA = Row address; BA = Bank address.
NOP commands are shown for ease of illustration; other commands may be valid at these times.
ISSI
Don't Care
(R)
Integrated Silicon Solution, Inc. -- 1-800-379-4774
Rev. 00A 04/17/06
Read with Auto Precharge (Burst Length = 4)
Rev. 00A 04/17/06
tCK tCL tCH tRP
CK CK
tIH tIS tIH VALID tIH tIS VALID VALID
IS43R16800A1
CKE
Command
tIH tIS
NOP
Read NOP NOP NOP NOP ACT NOP NOP
NOP
A0-A9, A11
COL n tIH tIS RA
A10
EN AP
tIH tIS
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RA
BA0, BA1
BA x
BA x
DM
tLZ (min) tRPRE
N
DQS
tHZ (min) tAC (min) tRPST tDQSCK (min) tHZ (min)
Case 1: tAC/tDQSCK = min
CL=2
DQ
DO n
tLZ (max) tRPRE
(c) DQS DQ
Case 2: tAC/tDQSCK = max
tAC (max) tLZ (max)
tHZ (max) tRPST tDQSCK (max)
DO n
DO n = data out from column n. 3 subsequent elements of data out are provided in the programmed order following DO n. EN AP = enable Auto Precharge. ACT = active; RA = row address. NOP commands are shown for ease of illustration; other commands may be valid at these times.
Don't Care
ISSI
65
(R)
66
tCK tCL tCH
CK CK
tIH tIS tRC VALID tIH tIS
IS43R16800A1
CKE
Command
tIH tIS RA tIH tIS ALL BANKS RA ONE BANK COL n RA
NOP NOP Read NOP PRE NOP NOP ACT NOP
ACT
A0-A9, A11
A10
DIS AP
tIH tIS
Bank Read Access (Burst Length = 4)
RA
BA0, BA1 DM
tLZ (min) tRPRE
BA x
BA x BA x*
BA x
N
tRP
DQS
tRCD tRAS tLZ (min) tHZ (min) tAC (min) tRPST tDQSCK (min)
Case 1: tAC/tDQSCK = min
CL=2
DQ
DO n
tLZ (max) tRPRE
DQS
tHZ (max) tAC (max) tLZ (max) tRPST tDQSCK (max)
Case 2: tAC/tDQSCK = max DQ
DO n
DO n = data out from column n. 3 subsequent elements of data out are provided in the programmed order following DO n. DIS AP = disable Auto Precharge. * = Don't care if A10 is High at this point. PRE = Precharge; ACT = Active; RA = Row address; BA = Bank address. NOP commands are shown for ease of illustration; other commands may be valid at these times.
ISSI
Don't Care
(R)
Integrated Silicon Solution, Inc. -- 1-800-379-4774 (c)
Rev. 00A 04/17/06
Write without Auto Precharge (Burst Length = 4)
Rev. 00A 04/17/06
tCH tCK tCL tRP tWR tIH tIS VALID tIH tIH tIS NOP NOP NOP NOP NOP PRE NOP Write NOP ACT tIH tIS COL n RA tIH tIS
CK
CK
IS43R16800A1
CKE
Command
A0-A9, A11
Integrated Silicon Solution, Inc. -- 1-800-379-4774
ALL BANKS
RA
A10
tIH tIS BA x tWPRE tWPRES tDQSH tDQSS tWPST tDQSL tDSH
DIS AP ONE BANK
N
BA0, BA1
BA x*
BA
DQS
DIn
(c)
DQ
DM
tDQSS = min. DIn = Data in for column n. 3 subsequent elements of data in are applied in the programmed order following DIn. DIS AP = Disable Auto Precharge. * = Don't care if A10 is High at this point. PRE = Precharge; ACT = Active; RA = Row address; BA = Bank address. NOP commands are shown for ease of illustration; other valid commands may be possible at these times.
Don't Care
ISSI
67
(R)
68
tCH tCK tCL tRP tWR tIH tDAL tIS VALID VALID VALID tIH tIS NOP NOP Write NOP NOP NOP NOP NOP NOP ACT tIH tIS COL n tIH tIS RA
CK
IS43R16800A1
CK
CKE
Command
A0 - 09, A11
Write with Auto Precharge (Burst Length = 4)
A10
tIH tIS BA x
EN AP
RA
N
BA0, BA1
BA
tWPRES tDSH tDQSS tDQSL tDQSH tWPST
DQS
DIn
DQ
DM
tWPRE
tDQSS = min.
ISSI
Don't Care
DIn = Data in for column n. 3 subsequent elements of data in are applied in the programmed order following DIn. EN AP = Enable Auto Precharge. ACT = Active; RA = Row address; BA = Bank address. NOP commands are shown for ease of illustration; other valid commands may be possible at these times.
(R)
Integrated Silicon Solution, Inc. -- 1-800-379-4774 (c)
Rev. 00A 04/17/06
Bank Write Access (Burst Length = 4)
Rev. 00A 04/17/06
tCH tCK tCL tIH tIS VALID tIH tRAS tIS NOP ACT NOP Write NOP NOP NOP NOP PRE NOP tIH tIS RA Col n tIH tIS RA
CK
CK
IS43R16800A1
CKE
Command
A0-A9, A11
Integrated Silicon Solution, Inc. -- 1-800-379-4774
ALL BANKS ONE BANK
tIH tIS BA x BA x tRCD tWPRES tDQSH tDQSS tDQSL tWPST tDSH tWR BA x
A10
DIS AP
N
BA0, BA1
DQS
DIn
(c)
DQ
DM
tWPRE
tDQSS = min. DI n = data in for column n. 3 subsequent elements of data in are applied in the programmed order following DI n. DIS AP = Disable Auto Precharge. * = don't care if A10 is High at this point. PRE = Precharge; ACT = Active; RA = Row address. NOP commands are shown for ease of illustration; other valid commands may be possible at these times.
Don't Care
ISSI
69
(R)
70
tCH tCK tCL tIH tIS VALID tIH tIS NOP NOP Write NOP NOP NOP PRE NOP NOP ACT tIH tIS COL n RA
CK
IS43R16800A1
CK
CKE
Command
A0-A9, A11
tIH tIS
Write DM Operation (Burst Length = 4)
ALL BANKS
RA
A10
tIH tIS BA x BA x*
DIS AP ONE BANK
N
BA0, BA1
BA
tWPRES tDQSH tDQSS tDQSL tWPST tDSH
tWR
tRP
DQS
DIn
Integrated Silicon Solution, Inc. -- 1-800-379-4774
(c)
DQ
DM
DI n = data in for column n. 3 subsequent elements of data in are applied in the programmed order following DI n (the second element of the 4 is masked). DIS AP = Disable Auto Precharge. * = Don't care if A10 is High at this point. PRE = Precharge; ACT = Active; RA = Row address; BA = Bank address. NOP commands are shown for ease of illustration; other valid commands may be possible at these times. tDQSS = min.
ISSI
Don't Care
(R)
Rev. 00A 04/17/06
IS43R16800A1
ISSI
Order Part No. IS43R16800A1-5TL Package 66-pin TSOP-II, Lead-free
(R)
ORDERING INFORMATION Commercial Range: 0C to +70C
Frequency 400 MHz Speed (ns) 5
Integrated Silicon Solution, Inc. -- 1-800-379-4774
Rev. 00A 04/17/06
71
PACKAGING INFORMATION
Plastic TSOP 66-pin Package Code: T (Type II)
ISSI
N/2+1 E1 E
Notes: 1. Controlling dimension: millimieters, unless otherwise specified. 2. BSC = Basic lead spacing between centers. 3. Dimensions D and E1 do not include mold flash protrusions and should be
(R)
N
measured from the bottom of the package.
4. Formed leads shall be planar with respect to one another within 0.004 inches at the seating plane.
1 D
N/2
SEATING PLANE
ZD
A
e
b
L A1
C
Plastic TSOP (T - Type II) Millimeters Inches Symbol Min Max Min Max Ref. Std. No. Leads (N) 66 A A1 A2 b C D E1 E e L L1 ZD -- 1.20 0.05 0.15 -- -- 0.24 0.40 0.12 0.21 22.02 22.42 10.03 10.29 11.56 11.96 0.65 BSC 0.40 0.60 -- -- 0.71 REF 0 8 -- 0.047 0.002 0.006 -- -- 0.009 0.016 0.005 0.0083 0.867 0.8827 0.395 0.405 0.455 0.471 0.026 BSC 0.016 0.024 -- -- 0.028 REF 0 8
Integrated Silicon Solution, Inc. -- 1-800-379-4774
Rev. A 08/09/05
1

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