Advanced
CAT24C163(16K), CAT24C083(8K)
CAT24C043(4K), CAT24C023(2K)
2
2
Supervisory Circuits with I C Serial CMOS E PROM, Precision Reset Controller and Watchdog Timer
FEATURES
■ Active High or Low Reset Outputs
— Precision Power Supply Voltage Monitoring
— 5V, 3.3V and 3V options
■ Watchdog Timer Input (WDI)
■ Programmable Reset Threshold
2
■ 400 KHz I C Bus Compatible
■ 1,000,000 Program/Erase Cycles
■ 100 Year Data Retention
■ 2.7 to 6 Volt Operation
■ Low Power CMOS Technology
■ 16 - Byte Page Write Buffer
■ Built-in inadvertent write protection
— VCC Lock Out
■ 8-Pin DIP or 8-Pin SOIC
■ Commercial, Industrial and Automotive
Temperature Ranges
DESCRIPTION
The CAT24CXX3 is a single chip solution to three
popular functions of EEPROM memory, precision reset
controller and watchdog timer. The 24C163(16K),
24C083(8K), 24C043(4K) and 24C023(2K) feature aI2C
Serial CMOS EEPROM Catalyst advanced CMOS tech-
nologysubstantiallyreducesdevicepowerrequirements.
The 24CXX3 features a 16-byte page and is available in
8-pin DIP or 8-pin SOIC packages.
The reset function of the 24CXX3 protects the system
duringbrownoutandpowerup/downconditions. During
system failure the watchdog timer feature protects the
microcontroller with a reset signal. 24CXX3 features
active low reset on pin 2 and active high reset on pin 7.
24CXX3 features watchdog timer on the WDI input pin
(pin 1).
PIN CONFIGURATION
BLOCK DIAGRAM
EXTERNAL LOAD
24CXX3
SENSE AMPS
SHIFT REGISTERS
D
OUT
V
WDI
RESET
WP
CC
ACK
RESET
SCL
V
V
CC
WORD ADDRESS
BUFFERS
COLUMN
DECODERS
SS
V
SDA
SS
START/STOP
*All products offered in P and J packages
SDA
WP
LOGIC
PIN FUNCTIONS
E2PROM
XDEC
Pin Name
Function
CONTROL
LOGIC
SDA
Serial Data/Address
Reset I/O
RESET/RESET
SCL
DATA IN STORAGE
Clock Input
Vcc
Power Supply
Ground
HIGH VOLTAGE/
TIMING CONTROL
VSS
RESET Controller
High
WDI
Watchdog Timer Input
Write Protect
STATE COUNTERS
SCL
Precision
SLAVE
ADDRESS
COMPARATORS
WP
WATCHDOG
Vcc Monitor
24C1601 BLOCK
WDI RESET/RESET
© 1998 by Catalyst Semiconductor, Inc.
Doc. No. 25080-00 3/98 M-1
1
Characteristics subject to change without notice