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IS24C32C
32K-bit 2-WIRE SERIAL CMOS EEPROM
FEATURES
* Two-Wire Serial Interface, I2CTM Compatible - Bi-directional data transfer protocol * Wide Voltage Operation - Vcc = 1.8V to 5.5V * 400 KHz (2.5V) and 1MHz (5.0V) Compatible * Low Power CMOS Technology - Standby Current: 1 A or less (1.8V) - Read Current: 2 mA or less (5.0V) - Write Current: 3 mA or less (5.0V) * Hardware Data Protection - protects entire array * Sequential Read Feature * Filtered Inputs for Noise Suppression * Self time write cycle with auto clear 5 ms max.@ 2.5V * Organization: - 4Kx8 (128 pages of 32 bytes) * 32 Byte Page Write Buffer * High Reliability - Endurance: 1,000,000 Cycles - Data Retention: 100 Years * Industrial temperature grade * Packages (8-pin): SOIC/SOP, TSSOP, MSOP, PDIP, DFN packages * Lead-free Available
FEBRUARY 2010
DESCRIPTION
The IS24C32C is electrically erasable PROM devices that use the standard 2-wire interface for communications. The IS24C32C contains a memory array of 32K-bits (4K x 8). Each device is organized into 32 byte pages for page write mode. This EEPROM operates in a wide voltage range of 1.8V to 5.5V to be compatible with most application voltages. ISSI designed this device family to be a practical, low-power 2-wire EEPROM solution. The device is offered in lead-free, RoHS, halogen free or Green. The available package types are 8-pin SOIC/SOP, TSSOP, MSOP, PDIP and DFN. The IS24C32C maintains compatibility with the popular 2-wire bus protocol, so it is easy to use in applications implementing this bus type. The simple bus consists of the Serial Clock wire (SCL) and the Serial Data wire (SDA). Using the bus, a Master device such as a microcontroller is usually connected to one or more Slave devices such as this device. The bit stream over the SDA line includes a series of bytes, which identifies a particular Slave device, an instruction, an address within that Slave device, and a series of data, if appropriate. The IS24C32C has a Write Protect pin (WP) to allow blocking of any write instruction transmitted over the bus.
Copyright (c) 2010 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.
Rev. D 02/04/10
1
IS24C32C
FUNCTIONAL BLOCK DIAGRAM
Vcc 8
HIGH VOLTAGE GENERATOR, TIMING & CONTROL
SDA 5 WP 7 SLAVE ADDRESS REGISTER & COMPARATOR A0 1 A1 2 A2 3 WORD ADDRESS COUNTER
X DECODER
SCL 6
CONTROL LOGIC
EEPROM ARRAY
Y DECODER
GND 4 nMOS
ACK
Clock DI/O
>
DATA REGISTER
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Integrated Silicon Solution, Inc.
Rev. D 02/04/10
IS24C32C
PIN CONFIGURATION 8-Pin DIP, SOIC, TSSOP, and MSOP
8-pad DFN
A0 A1 A2 GND
1 2 3 4
8 7 6 5
VCC WP SCL SDA
A0 1 A1 2 A2 3 GND 4
8 VCC 7 WP 6 SCL 5 SDA
(Top View)
PIN DESCRIPTIONS
A0-A2 SDA SCL WP Vcc GND Address Inputs Serial Address/Data I/O Serial Clock Input Write Protect Input Power Supply Ground Write Protection Array Addresses Protected
WP GND or floating Vcc IS24C32C None Entire Array
SCL
This input clock pin is used to synchronize the data transfer to and from the device.
SDA
The SDA is a Bi-directional pin used to transfer addresses and data into and out of the device. The SDA pin is an open drain output and can be wire-Ored with other open drain or open collector outputs. The SDA bus requires a pullup resistor to Vcc.
A0, A1, A2
The A0, A1 and A2 are the device address inputs that are hardwired or left not connected for hardware compatibility with the 24C16. When pins are hardwired, as many as eight 32K devices may be addressed on a single bus system. When the pins are not hardwired, the default values of A0, A1, and A2 are zero.
WP
WP is the Write Protect pin. The input level determines if all or none of the array is protected from modifications.
Integrated Silicon Solution, Inc.
Rev. D 02/04/10
3
IS24C32C
DEVICE OPERATION
IS24C32C features serial communication and supports a bidirectional 2-wire bus transmission protocol called I2CTM.
Stop Condition
The Stop condition is defined as a Low to High transition of SDA when SCL is High. All operations must end with a Stop condition.
2-WIRE BUS
The two-wire bus is defined as a Serial Data line (SDA), and a Serial Clock line (SCL). The protocol defines any device that sends data onto the SDA bus as a transmitter, and the receiving devices as receivers. The bus is controlled by a Master device that generates the SCL, controls the bus access, and generates the Stop and Start conditions. The IS24C32C is the Slave device on the bus.
Acknowledge (ACK)
After a successful data transfer, each receiving device is required to generate an ACK. The Acknowledging device pulls down the SDA line.
Reset
The IS24C32C contains a reset function in case the 2wire bus transmission is accidentally interrupted (eg. a power loss), or needs to be terminated mid-stream. The reset is caused when the Master device creates a Start condition. To do this, it may be necessary for the Master device to monitor the SDA line while cycling the SCL up to nine times. (For each clock signal transition to High, the Master checks for a High level on SDA.)
The Bus Protocol:
- Data transfer may be initiated only when the bus is not busy - During a data transfer, the SDA line must remain stable whenever the SCL line is high. Any changes in the SDA line while the SCL line is high will be interpreted as a Start or Stop condition. The state of the SDA line represents valid data after a Start condition. The SDA line must be stable for the duration of the High period of the clock signal. The data on the SDA line may be changed during the Low period of the clock signal. There is one clock pulse per bit of data. Each data transfer is initiated with a Start condition and terminated with a Stop condition.
Standby Mode
Power consumption is reduced in standby mode. The IS24C32C will enter standby mode: a) At Power-up, and remain in it until SCL or SDA toggles; b) Following the Stop signal if a no write operation is initiated; or c) Following any internal write operation.
Start Condition
The Start condition precedes all commands to the device and is defined as a High to Low transition of SDA when SCL is High. The EEPROM monitors the SDA and SCL lines and will not respond until the Start condition is met.
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Integrated Silicon Solution, Inc.
Rev. D 02/04/10
IS24C32C
DEVICE ADDRESSING
The Master begins a transmission by sending a Start condition. The Master then sends the address of the particular Slave devices it is requesting. The Slave device (Fig. 5) address is 8 bits. The four most significant bits of the Slave address are fixed as 1010 for the IS24C32C. The next three bits of the Slave address are A0, A1, and A2, and are used in comparison with the hard-wired input values on the A0, A1, and A2 pins. Up to eight IS24C32C units may share the 2-wire bus. The last bit of the Slave address specifies whether a Read or Write operation is to be performed. When this bit is set to 1, a Read operation is selected, and when set to 0, a Write operation is selected. After the Master transmits the Start condition and Slave address byte (Fig. 5), the appropriate 2-wire Slave, IS24C32C, will respond with ACK on the SDA line. The Slave will pull down the SDA on the ninth clock cycle, signaling that it received the eight bits of data. The selected EEPROM then prepares for a Read or Write operation by monitoring the bus.
WRITE OPERATION Byte Write
In the Byte Write mode, the Master device sends the Start condition and the Slave address information (with the R/W set to Zero) to the Slave device. After the Slave generates an ACK, the Master sends the two byte address that is to be written into the address pointer of the IS24C32C. After receiving another ACK from the Slave, the Master device transmits the data byte to be written into the address memory location. The IS24C32C acknowledges once more and the Master generates the Stop condition, at which time the device begins its internal programming cycle. While this internal cycle is in progress, the device will not respond to any request from the Master device.
Page Write
The IS24C32C is capable of 32-byte Page-Write operation. A Page-Write is initiated in the same manner as a Byte Write, but instead of terminating the internal Write cycle after the first data word is transferred, the Master device can transmit up to 31 more bytes. After the receipt of each data word, the EEPROM responds immediately with an ACK on SDA line, and the five lower order data word address bits are internally incremented by one, while the higher order bits of the data word address remain constant. If a byte address is incremented from the last byte of a page, it returns to the first byte of that page. If the Master device should transmit more than 32 bytes prior to issuing the Stop condition, the address counter will "roll over," and the previously written data will be overwritten. Once all 32 bytes are received and the Stop condition has been sent by the Master, the internal programming cycle begins. At this point, all received data is written to the IS24C32C in a single Write cycle. All inputs are disabled until completion of the internal Write cycle.
Acknowledge (ACK) Polling
The disabling of the inputs can be used to take advantage of the typical Write cycle time. Once the Stop condition is issued to indicate the end of the host's Write operation, the IS24C32C initiates the internal Write cycle. ACK polling can be initiated immediately. This involves issuing the Start condition followed by the Slave address for a Write operation. If the EEPROM is still busy with the Write operation, no ACK will be returned. If the IS24C32C has completed the Write operation, an ACK will be returned and the host can then proceed with the next Read or Write operation.
Integrated Silicon Solution, Inc.
Rev. D 02/04/10
5
IS24C32C
READ OPERATION
Read operations are initiated in the same manner as Write operations, except that the (R/W) bit of the Slave address is set to "1". There are three Read operation options: current address read, random address read and sequential read.
Random Address Read
Selective Read operations allow the Master device to select at random any memory location for a Read operation. The Master device first performs a 'dummy' Write operation by sending the Start condition, Slave address and byte address of the location it wishes to read. After the IS24C32C acknowledges the byte address, the Master device resends the Start condition and the Slave address, this time with the R/W bit set to one. The EEPROM then responds with its ACK and sends the data requested. The Master device does not send an ACK but will generate a Stop condition. (Refer to Figure 9. Random Address Read Diagram.)
Current Address Read
The IS24C32C contains an internal address counter which maintains the address of the last byte accessed, incremented by one. For example, if the previous operation is either a Read or Write operation addressed to the address location n, the internal address counter would increment to address location n+1. When the EEPROM receives the Slave Addressing Byte with a Read operation (R/W bit set to "1"), it will respond an ACK and transmit the 8-bit data byte stored at address location n+1. The Master should not acknowledge the transfer but should generate a Stop condition so the IS24C32C discontinues transmission. If 'n' is the last byte of the memory, the data from location '0' will be transmitted. (Refer to Figure 8. Current Address Read Diagram.)
Sequential Read
Sequential Reads can be initiated as either a Current Address Read or Random Address Read. After the IS24C32C sends the initial byte sequence, the Master device now responds with an ACK indicating it requires additional data from the IS24C32C. The EEPROM continues to output data for each ACK received. The Master device terminates the sequential Read operation by pulling SDA High (no ACK) indicating the last data word to be read, followed by a Stop condition. The data output is sequential, with the data from address n followed by the data from address n+1, n+2 ... etc. The address counter increments by one automatically, allowing the entire memory contents to be serially read during sequential Read operation. When the memory address boundary of 8191 for IS24C32C is reached, the address counter "rolls over" to address 0, and the device continues to output data. (Refer to Figure 10. Sequential Read Diagram).
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Integrated Silicon Solution, Inc.
Rev. D 02/04/10
IS24C32C
Figure 1. Typical System Bus Configuration
Vcc
SDA SCL
Master Transmitter/ Receiver
IS24CXX
Figure 2. Output Acknowledge
SCL from Master
1
8
9
Data Output from Transmitter
tAA tAA
Data Output from Receiver
ACK
Figure 3. START and STOP Conditions
STOP Condition
SDA
Integrated Silicon Solution, Inc.
Rev. D 02/04/10
START Condition
SCL
7
IS24C32C
Figure 4. Data Validity Protocol
Data Change
SCL
Data Stable Data Stable
SDA
Figure 5. Slave Address
BIT
7
6
5
4
3
2
1
0
1
0
1
0
A2
A1
A0
R/W
Figure 6. Byte Write
S T A R T W R I T E S T O P A C K
Device Address
SDA Bus Activity
M S B
Word Address Word Address A A A C**** C C K K K L M S * = Don't care bits S B B R/W
Data
Figure 7. Page Write
S T A R T W R I T E S T O P A C K
Device Address
SDA Bus Activity
Word Address (n) Word Address (n) A A A C C**** C K K K * = Don't care bits
Data (n) A C K
Data (n+1) A C K
Data (n+31)
M S B
L S B R/W
8
Integrated Silicon Solution, Inc.
Rev. D 02/04/10
IS24C32C
Figure 8. Current Address Read
S T A R T SDA Bus Activity M S B L S B R/W
Device Address
R E A D A C K
Data
S T O P
N O A C K
Figure 9. Random Address Read
S T A R T SDA Bus Activity M S B W R I T E S T A R T A C K
Device Address
Word Address (n) A C* * * * K A C K
Word Address (n)
Device Address
R E A D A C K
Data n
S T O P
L S B R/W DUMMY WRITE
N O * = Don't care bits A C K
Figure 10. Sequential Read
R E A D A C K S T O P
Device Address SDA Bus Activity
Data Byte n A C K
Data Byte n+1 A C K
Data Byte n+2 A C K
Data Byte n+X
N O R/W A C K
Integrated Silicon Solution, Inc.
Rev. D 02/04/10
9
IS24C32C
AC WAVEFORMS Figure 11. Bus Timing
tR
tF
tHIGH
tLOW
tSU:STO
SCL
tSU:STA tHD:STA tHD:DAT tSU:DAT tBUF
SDAIN
tAA
tDH
SDAOUT
tSU:WP
tHD:WP
WP
Figure 12. Write Cycle Timing
SCL
SDA
8th BIT WORD n
ACK
tWR
STOP Condition START Condition
10
Integrated Silicon Solution, Inc.
Rev. D 02/04/10
IS24C32C
ABSOLUTE MAXIMUM RATINGS(1)
Symbol VS VP TBIAS TSTG IOUT Parameter Supply Voltage Voltage on Any Pin Temperature Under Bias Storage Temperature Output Current Value -0.5 to +6.5 -0.5 to Vcc + 0.5 -55 to +125 -65 to +150 5 Unit V V C C mA
Notes: 1. Stress 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.
DC ELECTRICAL CHARACTERISTICS Industrial (TA = -40oC to +85oC)
Symbol VOL1 VOL2 VIH VIL ILI ILO Parameter Output Low Voltage Output Low Voltage Input High Voltage Input Low Voltage Input Leakage Current Output Leakage Current VIN = VCC max. Test Conditions VCC = 1.8V, IOL = 0.15 mA VCC = 2.5V, IOL = 3 mA Min. -- -- -1.0 -- -- Max. 0.2 0.4 VCC X 0.3 3 3 Unit V V V V A A
VCC X 0.7 VCC + 0.5
POWER SUPPLY CHARACTERISTICS Industrial (TA = -40oC to +85oC)
Symbol ICC1 ICC2 ISB1 ISB2 ISB3 Parameter Operating Current Operating Current Standby Current Standby Current Standby Current Test Conditions Read at 400 KHz (Vcc = 5V) Write at 400 KHz (Vcc = 5V) Vcc = 1.8V Vcc = 2.5V Vcc = 5.0V Min. -- -- -- -- -- Max. 2.0 3.0 1 2 6 Unit mA mA A A A
CAPACITANCE(1,2)
Symbol CIN COUT Parameter Input Capacitance Output Capacitance Conditions VIN = 0V VOUT = 0V Max. 6 8 Unit pF pF
Notes: 1. Tested initially and after any design or process changes that may affect these parameters. 2. Test conditions: TA = 25C, f = 1 MHz, Vcc = 5.0V.
Integrated Silicon Solution, Inc.
Rev. D 02/04/10
11
IS24C32C
AC ELECTRICAL CHARACTERISTICS Industrial (TA = -40oC to +85oC)
1.8V Vcc < 2.5V Symbol fSCL T tLow tHigh tBUF tSU:STA tSU:STO tHD:STA tHD:STO tSU:DAT tHD:DAT tSU:WP tHD:WP tDH tAA tR tF tWR Parameter SCL Clock Frequency Noise Suppression Time(1) Clock Low Period Clock High Period Bus Free Time Before New Transmission(1) Start Condition Setup Time Stop Condition Setup Time Start Condition Hold Time Stop Condition Hold Time Data In Setup Time Data In Hold Time WP pin Setup Time WP pin Hold Time Data Out Hold Time (SCL Low to SDA Data Out Change) Clock to Output (SCL Low to SDA Data Out Valid) SCL and SDA Rise Time(1) SCL and SDA Fall Time(1) Write Cycle Time Min. 0 -- 4.7 4 4.7 4 4 4 4 100 0 4 4.7 100 100 -- -- -- Max. 100 100 -- -- -- -- -- -- -- -- -- -- -- -- 3500 1000 300 5 2.5V Vcc < 4.5V Min. 0 -- 1.2 0.6 1.2 0.6 0.6 0.6 0.6 100 0 0.6 1.2 50 50 -- -- -- Max. 400 50 -- -- -- -- -- -- -- -- -- -- -- -- 900 300 300 5 4.5V Vcc 5.5V(1) Min. 0 -- 0.6 0.4 0.5 0.25 0.25 0.25 0.25 100 0 0.6 1.2 50 50 -- -- -- Max. 1000 50 -- -- -- -- -- -- -- -- -- -- -- -- 400 300 100 5 Unit KHz ns s s s s s s s ns ns s s ns ns ns ns ms
Note: 1. These parameters are characterized but not 100% tested.
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Integrated Silicon Solution, Inc.
Rev. D 02/04/10
IS24C32C
ORDERING INFORMATION
Industrial Range: -40C to +85C, Lead-free*
Voltage Range 1.8V to 5.5V Part Number* IS24C32C-2GLI-TR IS24C32C-2ZLI-TR IS24C32C-2SLI-TR IS24C32C-2PLI-TR IS24C32C-2DLI-TR Package* (8-pin) 150-mil SOIC (JEDEC) 3x4.4 mm TSSOP 120-mil MSOP 300-mil Plastic DIP 2x3 mm DFN
* 1. Contact ISSI Sales Representatives for availability and other package information. 2. The listed part numbers are packed in tape and reel "-TR" (4K per reel). DFN is 5K per reel. 3. Refer to ISSI website for related declaration document on lead free, RoHS, halogen free or Green, whichever is applicable. 4. ISSI offers Industrial grade for Commercial applications (0oC to +70oC).
Integrated Silicon Solution, Inc.
Rev. D 02/04/10
13
IS24C32C
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Integrated Silicon Solution, Inc.
Rev. D 02/04/10
IS24C32C
Integrated Silicon Solution, Inc.
Rev. D 02/04/10
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IS24C32C
PACKAGING INFORMATION
PlasticMSOP Package Code: S
N
E1
E
1 D
SEATING PLANE
A
A1 e B
L
C
Ref. Std. No. Leads
Plastic MSOP (S) JEDEC MO 187 8 (120 mil) Inches Min Max 0.038 0.043 0.002 0.006 0.010 0.016 0.005 0.009 0.114 0.122 0.193 BSC 0.114 0.122 0.0256BSC -- 0.022 -- 7 Millimeters Min Max 0.97 1.10 0.05 0.15 0.25 0.40 0.13 0.23 2.90 3.10 4.90BSC 2.90 3.10 0.65BSC -- 0.55 -- 7
Notes: 1. Controlling dimension: inches, unless otherwise specified. 2. BSC = Basic lead spacing between centers. 3. Dimensions D and E do not include mold flash protrusions and should be measured
Symbol A A1 B C D E E1 e L
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.
ISSI reserves the right to make changes to its products at any time without notice in order to improve design and supply the best possible product. We assume no responsibility for any errors which may appear in this publication. (c) Copyright 2002, Integrated Silicon Solution, Inc.
Integrated Silicon Solution, Inc. -- 1-800-379-4774
Rev. D 02/01/02
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Integrated Silicon Solution, Inc.
Rev. D 02/04/10
IS24C32C
Integrated Silicon Solution, Inc.
Rev. D 02/04/10
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IS24C32C
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Integrated Silicon Solution, Inc.
Rev. D 02/04/10

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