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CAT1161/2 (16K)
Supervisory Circuits with I2C Serial CMOS EEPROM, Precision Reset Controller and Watchdog Timer
FEATURES
s Watchdog monitors SDA signal (CAT1161) s 400kHz I C bus compatible s 2.7V to 6.0V operation s Low power CMOS technology s 16-Byte page write buffer s Built-in inadvertent write protection
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s Active high or low reset
-- Precision power supply voltage monitor -- 5V, 3.3V and 3V systems -- Five threshold voltage options
s 1,000,000 Program/Erase cycles s Manual Reset s 100 Year data retention s 8-pin DIP or 8-pin SOIC s Commercial and industrial temperature ranges
-- VCC lock out -- Write protect pin, WP
DESCRIPTION
The CAT1161/2 is a complete memory and supervisory solution for microcontroller-based systems. A serial EEPROM memory (16K) with hardware memory write protection, a system power supervisor with brown out protection and a watchdog timer are integrated together in low power CMOS technology. Memory interface is via an I2C bus. The 1.6-second watchdog circuit returns a system to a known good state if a software or hardware glitch halts or "hangs" the system. The CAT1161 watchdog monitors the SDA line, making an additional PC board trace unnecessary. The lower cost CAT1162 does not have a watchdog timer. The power supply monitor and reset circuit protects memory and system controllers during power up/down and against brownout conditions. Five reset threshold
voltages support 5V, 3.3V and 3V systems. If power supply voltages are out of tolerance reset signals become active, preventing the system microcontroller, ASIC or peripherals from operating. Reset signals become inactive typically 200 ms after the supply voltage exceeds the reset threshold level. With both active high and low reset signals, interface to microcontrollers and other ICs is simple. In addition, a reset pin can be used as a debounced input for push-button manual reset capability. The CAT1161/2 memory features a 16-byte page. In addition, hardware data protection is provided by a write protect pin WP and by a VCC sense circuit that prevents writes to memory whenever VCC falls below the reset threshold or until VCC reaches the reset threshold during power up. Available packages include an 8-pin DIP and a surface mount, 8-pin SO package.
PIN CONFIGURATION
DC RESET WP GND VCC RESET SCL SDA
BLOCK DIAGRAM
EXTERNAL LOAD DOUT ACK VCC GND WORD ADDRESS BUFFERS COLUMN DECODERS SENSE AMPS SHIFT REGISTERS
CAT1161/2
SDA
START/STOP LOGIC 16K EEPROM
XDEC
DC = Do not connect
WP
CONTROL LOGIC
Part Dash Minimum Number Threshold
-45 -42 -30 -28 -25 4.50 4.25 3.00 2.85 2.55
Maximum Threshold
4.75 4.50
RESET Controller
DATA IN STORAGE
HIGH VOLTAGE/ TIMING CONTROL STATE COUNTERS SLAVE ADDRESS COMPARATORS
3.15 3.00 2.70
Only for CAT1161
WATCHDOG
SCL
Precision
Vcc Monitor
RESET RESET
(c) 2002 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice
Doc No. 3002, Rev. D
CAT1161/2
ABSOLUTE MAXIMUM RATINGS
Temperature Under Bias ................. -55C to +125C Storage Temperature ....................... -65C to +150C Voltage on any Pin with Respect to Ground(1) ............ -2.0V to +VCC +2.0V VCC with Respect to Ground ............... -2.0V to +7.0V Package Power Dissipation Capability (TA = 25C) ................................... 1.0W Lead Soldering Temperature (10 secs) ............ 300C Output Short Circuit Current(2) ........................ 100 mA
PIN FUNCTIONS Pin No. Pin Name
1 2 3 4 5 6 7 8 DC RESET WP GND SDA SCL RESET VCC
Function
Do Not Connect Active Low Reset I/O Write Protect Ground Serial Data/Address Clock Input Active High Reset I/O Power Supply
Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions outside of those listed in the operational sections of this specification is not implied. Exposure to any absolute maximum rating for extended periods may affect device performance and reliability.
RELIABILITY CHARACTERISTICS Symbol NEND
(3)
Parameter Endurance Data Retention ESD Susceptibility Latch-Up
Reference Test Method
Min
Max
Units Cycles/Byte Years Volts mA
MIL-STD-883, Test Method 1033 1,000,000 MIL-STD-883, Test Method 1008 MIL-STD-883, Test Method 3015 JEDEC Standard 17 100 2000 100
TDR(3) VZAP(3) ILTH(3)(4)
D.C. OPERATING CHARACTERISTICS VCC = +2.7V to +6.0V, unless otherwise specified. Symbol ICC ISB ILI ILO VIL VIH VOL1 Parameter Power Supply Current Standby Current Input Leakage Current Output Leakage Current Input Low Voltage Input High Voltage Output Low Voltage (SDA) IOL = 3 mA, VCC = 3.0V Test Conditions fSCL = 100 KHz VCC = 3.3V VCC = 5 VIN = GND or VCC VIN = GND or VCC -1 VCC X 0.7 Min Typ Max 3 40 50 2 10 VCC x 0.3 VCC + 0.5 0.4 Units mA A A A A V V V
Note: (1) The minimum DC input voltage is -0.5V. During transitions, inputs may undershoot to -2.0V for periods of less than 20 ns. Maximum DC voltage on output pins is VCC +0.5V, which may overshoot to VCC +2.0V for periods of less than 20 ns. (2) Output shorted for no more than one second. No more than one output shorted at a time. (3) This parameter is tested initially and after a design or process change that affects the parameter. (4) Latch-up protection is provided for stresses up to 100 mA on address and data pins from -1V to VCC +1V.
Doc. No. 3002, Rev. D
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CAT1161/2
CAPACITANCE TA = 25C, f = 1.0 MHz, VCC = 5V Symbol CI/O(1) CIN(1) Test Input/Output Capacitance (SDA) Input Capacitance (SCL) Conditions VI/O = 0V VIN = 0V Max 8 6 Units pF pF
A.C. CHARACTERISTICS
VCC=2.7V to 6.0V unless otherwise specified. Output Load is 1 TTL Gate and 100pF.
VCC = 2.7V - 6V SYMBOL FSCL TI(1) tAA tBUF(1) tHD:STA tLOW tHIGH tSU:STA tHD:DAT tSU:DAT tR(1) tF(1) tSU:STO tDH PARAMETER Clock Frequency Noise Suppresion Time Constant at SCL, SDA Inputs SLC Low to SDA Data Out and ACK Out Time the Bus Must be Free Before a New Transmission Can Start Start Condition Hold Time Clock Low Period Clock High Period Start Condition Setup Time (for a Repeated Start Condition) Data in Hold Time Data in Setup Time SDA and SCL Rise Time SDA and SCL Fall Time Stop Condition Setup Time Data Out Hold Time 4 100 0 50 1 300 4 4.7 4 4.7 4.7 3.5 Min Max 100 200
VCC = 4.5V - 5.5V Min Max 400 200 1 1.2 0.6 1.2 0.6 0.6 0 50 0.3 300 0.6 100 Units kHz ns s s s s s s ns ns s ns s ns
POWER-UP TIMING (1)(2) Symbol tPUR tPUW Parameter Power-up to Read Operation Power-up to Write Operation Max 1 1 Units ms ms
WRITE CYCLE LIMITS Symbol tWR Parameter Write Cycle Time Min Typ Max 10 Units ms
The write cycle time is the time from a valid stop condition of a write sequence to the end of the internal program/erase cycle. During the write cycle, the bus interface circuits are disabled, SDA is allowed to remain high, and the device does not respond to its slave address. NOTE: (1) This parameter is tested initially and after a design or process change that affects the parameter. (2) tPUR and tPUW are the delays required from the time VCC is stable until the specific operation can be initiated.
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Doc No. 3002, Rev. D
CAT1161/2
RESET CIRCUIT CHARACTERISTICS Symbol tGLITCH VRT VOLRS VOHRS Parameter Glitch Reject Pulse Width Reset Threshold Hystersis Reset Output Low Voltage (IOLRS=1mA) Reset Output High Voltage Reset Threshold (VCC=5V) (CAT1161/2-45) Reset Threshold (VCC=5V) (CAT1161/2-42) VTH Reset Threshold (VCC=3.3V) (CAT1161/2-30) Reset Threshold (VCC=3.3V) (CAT1161/2-28) Reset Threshold (VCC=3V) (CAT1161/2-25) tPURST twp tRPD VRVALID Power-Up Reset Timeout Watchdog Period VTH to RESET Output Delay RESET Output Valid 1 4.25 3.00 2.85 2.55 130 1.6 5 4.50 3.15 3.00 2.70 270 ms sec s V VCC-0.75 4.50 4.75 15 0.4 Min Typ Max 100 Units ns mV V V
V
Doc. No. 3002, Rev. D
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CAT1161/2
PIN DESCRIPTIONS
WP: WRITE PROTECT If the pin is tied to VCC the entire memory array becomes Write Protected (READ only). When the pin is tied to GND or left floating normal read/write operations are allowed to the device. RESET/RESET RESET I/O RESET: RESET These are open drain pins and can be used as reset trigger inputs. By forcing a reset condition on the pins the device will initiate and maintain a reset condition. The RESET pin must be connected through a pulldown resistor, and the RESET pin must be connected through a pull-up resistor. SDA: SERIAL DATA ADDRESS The bidirectional serial data/address pin is used to transfer all 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. If there is no transition on the SDA for more than 1.6 seconds, the watchdog timer times out. SCL: SERIAL CLOCK Serial clock input. remain active until VCC reaches the VTH threshold and will continue driving the outputs for approximately 200ms (tPURST) after reaching VTH. After the tPURST timeout interval, the device will cease to drive the reset outputs. At this point the reset outputs will be pulled up or down by their respective pull up/down resistors. During power-down, the RESET outputs will be active when VCC falls below VTH. The RESET outputs will be valid so long as VCC is >1.0V (VRVALID). The RESET pins are I/Os; therefore, the CAT1161/2 can act as a signal conditioning circuit for an externally applied manual reset. The inputs are edge triggered; that is, the RESET input in the CAT1161/2 will initiate a reset timeout after detecting a low to high transition and the RESET input will initiate a reset timeout after detecting a high to low transition. Watchdog Timer The Watchdog Timer provides an independent protection for microcontrollers. During a system failure, the CAT1161will respond with a reset signal after a time-out interval of 1.6 seconds for a lack of activity. The CAT1161 is designed with the Watchdog Timer feature on the SDA input. If the microcontroller does not toggle the SDA input pin within 1.6 seconds, the Watchdog Timer times out. This will generate a reset condition on reset outputs. The Watchdog Timer is cleared by any transition on SDA.
DEVICE OPERATION
Reset Controller Description
As long as the reset signal is asserted, the Watchdog Timer The CAT1161/2 precision RESET controller ensures will not count and will stay cleared. correct system operation during brownout and power up/down conditions. It is configured with open drain The CAT1162 does not have a Watchdog. RESET outputs. During power-up, the RESET outputs
Figure 1. RESET Output Timing
t
GLITCH
VTH VRVALID VCC t PURST t RPD t PURST
RESET
t RPD
RESET
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Doc No. 3002, Rev. D
CAT1161/2
Hardware Data Protection The CAT1161/2 is designed with the following hardware data protection features to provide a high degree of data integrity. (1) The CAT1161/2 features a WP pin. When the WP pin is tied high the entire memory array becomes write protected (read only). (2) The VCC sense provides write protection when VCC falls below the reset threshold value (VTH). The VCC lock out inhibits writes to the serial EEPROM whenever VCC falls below (power down) VTH or until VCC reaches the reset threshold (power up) VTH. Any attempt to access the internal EEPROM is not recognized and an ACK will not be sent on the SDA line when RESET or RESET is active. Reset Threshold Voltage The CAT1161/2 is offered with five reset threshold voltage ranges. They are 4.50-4.75V, 4.25-4.50V, 3.003.15V, 2.85-3.00V and 2.55-2.70V.
Figure 2. Bus Timing
tF tLOW SCL tSU:STA tHD:STA tHD:DAT tSU:DAT tSU:STO tHIGH tLOW tR
SDA IN tAA SDA OUT tDH tBUF
Figure 3. Write Cycle Timing
SCL
SDA
8TH BIT BYTE n
ACK tWR STOP CONDITION START CONDITION ADDRESS
Figure 4. Start/Stop Timing
SDA
SCL START BIT STOP BIT
Doc. No. 3002, Rev. D
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CAT1161/2
FUNCTIONAL DESCRIPTION
The CAT1161/2 supports the I2C Bus data transmission protocol. This Inter-Integrated Circuit Bus protocol defines any device that sends data to the bus to be a transmitter and any device receiving data to be a receiver. The transfer is controlled by the Master device which generates the serial clock and all START and STOP conditions for bus access. Both the Master device and Slave device can operate as either transmitter or receiver, but the Master device controls which mode is activated. I2C Bus Protocol The features of the I2C bus protocol are defined as follows: (1) Data transfer may be initiated only when the bus is not busy. (2) During a data transfer, the data line must remain stable whenever the clock line is high. Any changes in the data line while the clock line is high will be interpreted as a START or STOP condition. 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 CAT1161/2 monitors the SDA and SCL lines and will not respond until this condition is met. STOP Condition A LOW to HIGH transition of SDA when SCL is HIGH determines the STOP condition. All operations must end with a STOP condition.
DEVICE ADDRESSING
The Master begins a transmission by sending a START condition. The Master sends the address of the particular slave device it is requesting. The four most significant bits of the 8-bit slave address are fixed as 1010. The next three bits (Figure 6) define memory addressing. For the CAT1161/162 the three bits define higher order bits. 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 sends a START condition and the slave address byte, the CAT1161/2 monitors the bus and responds with an acknowledge (on the SDA line) when its address matches the transmitted slave address. The CAT1161/2 then performs a Read or Write operation depending on the R/W bit.
Figure 5. Acknowledge Timing
SCL FROM MASTER 1 8 9
DATA OUTPUT FROM TRANSMITTER
DATA OUTPUT FROM RECEIVER START ACKNOWLEDGE
Figure 6. Slave Address Bits
CAT1161/2 CAT 24C163
1
0
1
0
a10
a9
a8
R/W
**a8, a9 and a10 correspond to the address of the memory array address word.
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Doc No. 3002, Rev. D
CAT1161/2
ACKNOWLEDGE
After a successful data transfer, each receiving device is required to generate an acknowledge. The acknowledging device pulls down the SDA line during the ninth clock cycle, signaling that it received the 8 bits of data. The CAT1161/2 responds with an acknowledge after receiving a START condition and its slave address. If the device has been selected along with a write operation, it responds with an acknowledge after receiving each 8bit byte. When the CAT1161/2 begins a READ mode it transmits 8 bits of data, releases the SDA line and monitors the line for an acknowledge. Once it receives this acknowledge, the CAT1161/2 will continue to transmit data. If no acknowledge is sent by the Master, the device terminates data transmission and waits for a STOP condition. pointers of the CAT1161/2. After receiving another acknowledge from the Slave, the Master device transmits the data to be written into the addressed memory location. The CAT1161/2 acknowledges once more and the Master generates the STOP condition. At this time, the device begins an internal programming cycle to non-volatile memory. While the cycle is in progress, the device will not respond to any request from the Master device. Page Write The CAT1161/2 writes up to 16 bytes of data in a single write cycle, using the Page Write operation. The page write operation is initiated in the same manner as the byte write operation, however instead of terminating after the initial byte is transmitted, the Master is allowed to send up to 15 additional bytes. After each byte has been transmitted, the CAT1161/2 will respond with an acknowledge and internally increment the lower order address bits by one. The high order bits remain unchanged. If the Master transmits more than 16 bytes before sending the STOP condition, the address counter `wraps around,' and previously transmitted data will be overwritten. When all 16 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 CAT1161/2 in a single write cycle.
WRITE OPERATIONS
Byte Write In the Byte Write mode, the Master device sends the START condition and the slave address information (with the R/W bit set to zero) to the Slave device. After the Slave generates an acknowledge, the Master sends a 8-bit address that is to be written into the address
Figure 7. Byte Write Timing
BUS ACTIVITY: MASTER SDA LINE
S T A R T S
SLAVE ADDRESS
BYTE ADDRESS
DATA
S T O P P
A C K
A C K
A C K
Figure 8. Page Write Timing
S T A R T S A C K A C K A C K A C K A C K
BUS ACTIVITY: MASTER SDA LINE
SLAVE ADDRESS
BYTE ADDRESS (n)
DATA n
DATA n+1
S T DATA n+15 O P P
Doc. No. 3002, Rev. D
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CAT1161/2
Acknowledge Polling 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 opration, the CAT1161/2 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 CAT1161/2 is still busy with the write operation, no ACK will be returned. If a write operation has completed, an ACK will be returned and the host can then proceed with the next read or write operation. protected and becomes read only. The CAT1161/2 will accept both slave and byte addresses, but the memory location accessed is protected from programming by the device's failure to send an acknowledge after the first byte of data is received. Read Operations The READ operation for the CAT1161/2 is initiated in the same manner as the write operation with one exception, that R/W bit is set to one. Three different READ operations are possible: Immediate/Current Address READ, Selective/Random READ and Sequential READ.
WRITE PROTECTION
The Write Protection feature allows the user to protect against inadvertent memory array programming. If the WP pin is tied to VCC, the entire memory array is
Figure 9. Immediate Address Read Timing
BUS ACTIVITY: MASTER SDA LINE
S T A R T S
SLAVE ADDRESS
S T O P P A C K DATA N O A C K
SCL
8
9
SDA
8TH BIT DATA OUT NO ACK STOP
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Doc No. 3002, Rev. D
CAT1161/2
Immediate/Current Address Read The CAT1161/2 address counter contains the address of the last byte accessed, incremented by one. In other words, if the last READ or WRITE access was to address N, the READ immediately following would access data from address N+1. For all devices, N=E=2047. The counter will wrap around to Zero and continue to clock out valid data for the 16K devices. After the CAT1161/ 2 receives its slave address information (with the R/W bit set to one), it issues an acknowledge, then transmits the 8-bit byte requested. The master device does not send an acknowledge, but will generate a STOP condition. Selective/Random Read Selective/Random 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 addresses of the location it wishes to read. After the CAT1161/2 acknowledges, the Master device sends the START condition and the slave address again, this time with the R/W bit set to one. The CAT1161/2 then responds with its acknowledge and sends the 8-bit byte requested. The master device does not send an acknowledge but will generate a STOP condition. Sequential Read The Sequential READ operation can be initiated by either the Immediate Address READ or Selective READ operations. After the CAT1161/2 sends the inital 8-bit byte requested, the Master will responds with an acknowledge which tells the device it requires more data. The CAT1161/2 will continue to output an 8-bit byte for each acknowledge, thus sending the STOP condition. The data being transmitted from the CAT1161/2 is outputted sequentially with data from address N followed by data from address N+1. The READ operation address counter increments all of the CAT1161/2 address bits so that the entire memory array can be read during one operation. If more than E (where E=2047 for the CAT1161/162) bytes are read out, the counter will `wrap around' and continue to clock out data bytes. Manual Reset Operation The CAT116x RESET or RESET pin can also be used as a manual reset input. Only the "active" edge of the manual reset input is internally sensed. The positive edge is sensed if RESET is used as a manual reset input and the negative edge is sensed if RESET is used as a manual reset input. An internal counter starts a 200 ms count. During this time, the complementary reset output will be kept in the active state. If the manual reset input is forced active for more than 200 ms, the complementary reset output will switch back to the non active state after the 200 ms expired, regardless for how long the manual reset input is forced active. The embedded EEPROM is disabled as long as a reset condition is maintained on any RESET pin. If the external forced RESET/RESET is longer than internal controlled time-out period, tPURST, the memory will not respond with an acknowledge for any access as long as the manual reset input is active.
Figure 10. Selective Read Timing
S T A R T S A C K A C K S T A R T S A C K DATA n N O A C K
BUS ACTIVITY: MASTER SDA LINE
SLAVE ADDRESS
BYTE ADDRESS (n)
SLAVE ADDRESS
S T O P P
Doc. No. 3002, Rev. D
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CAT1161/2
Figure 11. Sequential Read Timing
BUS ACTIVITY: MASTER SDA LINE A C K A C K A C K A C K N O A C K SLAVE ADDRESS DATA n DATA n+1 DATA n+2 DATA n+x S T O P P
Ordering Information
Prefix CAT Device # 1162 J Suffix I -30 TE13
Optional Company ID
Product Number 1161: 16K 1162: 16K
Temperature Range Blank = Commercial (0 to 70C) I = Industrial (-40 to 85C)
Tape & Reel TE13: 2000/Reel
Package P: PDIP J: SOIC (JEDEC)
Reset Threshold Voltage 45: 4.5-4.75V 42: 4.25-4.5V 30: 3.0-3.15V 28: 2.85-3.0V 25: 2.55-2.7V
Note: (1) The device used in the above example is a CAT1162JI-30TE13 (16K I2C Memory, SOIC, Industrial Temperature, 3.0-3.15V Reset Threshold Voltage, Tape and Reel)
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Doc No. 3002, Rev. D
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Publication #: Revison: Issue date: Type:
3002 D 03/29/02 Final

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