1
24C1601 BLOCK
CAT24CXX1/XX2
Microprocessor Supervisor with Embedded Memory
DESCRIPTION
The CAT24CXXX is a single chip solution to three
popular functions of EEPROM memory, precision reset
controller and watchdog timer. The 24C161/162(16K),
24C081/082(8K), 24C041/042(4K) and 24C021/022(2K)
feature a I
2
C Serial CMOS EEPROM. Catalyst's ad-
vanced CMOS technology substantially reduces device
power requirements. The 24CXXX features a 16-byte
page and is available in 8-pin DIP or 8-pin SOIC packages.
The reset function of the 24CXXX protects the system
during brown out and power up/down conditions. During
system failure the watchdog timer feature protects the
microcontroller with a reset signal. 24CXXX features
active low reset on pin 2 and active high reset on pin 7.
24CXX1 features watchdog timer on the SDA line.
24CXX2 does not feature the watchdog timer function.
Pin Name
Function
SDA
Serial Data/Address
RESET/
RESET
Reset I/O
SCL
Clock Input
Vcc
Power Supply
DC
Do Not Connect
V
SS
Ground
WP
Write Protect
PIN FUNCTIONS
PIN CONFIGURATION
24CXX1/XX2*
BLOCK DIAGRAM
*All products offered in P and J packages
Advanced Information
FEATURES
DOUT
ACK
SENSE AMPS
SHIFT REGISTERS
CONTROL
LOGIC
WORD ADDRESS
BUFFERS
START/STOP
LOGIC
E
2
PROM
VCC
EXTERNAL LOAD
COLUMN
DECODERS
XDEC
DATA IN STORAGE
HIGH VOLTAGE/
TIMING CONTROL
VSS
WP
SDA
RESET Controller
High
Precision
Vcc Monitor
STATE COUNTERS
SLAVE
ADDRESS
COMPARATORS
SCL
Only for
24C161
RESET/
RESET
WATCHDOG
1998 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
s
Watchdog Timer on SDA for 24CXX1
s
Programmable Reset Threshold
s
400 KHz I2C Bus Compatible
s
2.7 to 6 Volt Operation
s
Low Power CMOS Technology
s
16 - Byte Page Write Buffer
s
Built-in inadvertent write protection
--
V
CC
Lock Out
s
Active High or Low Reset Outputs
-- Precision Power Supply Voltage Monitoring
--
5V, 3.3V and 3V options
s
1,000,000 Program/Erase Cycles
s
100 Year Data Retention
s
8-Pin DIP or 8-Pin SOIC
s
Commercial, Industrial and Automotive
Temperature Ranges
Doc. No. 25079-00 1/98 M-1
DC
VCC
RESET
SCL
SDA
RESET
WP
VSS
PDF 
ZIP