CAT1163 (16K)
Supervisory Circuit with I2C Serial CMOS EEPROM, Precision Reset Controller and Watchdog Timer
FEATURES
■ Active high or low reset
— Precision power supply voltage monitor
— 5V, 3.3V and 3V systems
■ Watchdog timer input (WDI)
■ 400kHz I2C bus compatible
■ 2.7V to 6.0V operation
— Five threshold voltage options
■ 1,000,000 Program/Erase cycles
■ Manual reset
■ Low power CMOS technology
■ 16-Byte page write buffer
■ Built-in inadvertent write protection
— VCC lock out
■ 100 Year data retention
■ 8-pin DIP or 8-pin SOIC
■ Commercial and industrial temperature ranges
— Write protect pin, WP
DESCRIPTION
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 debounced input for
push-button manual reset capability.
The CAT1163 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
protectionandawatchdogtimerareintegratedtogether
inlowpowerCMOStechnology. Memoryinterfaceisvia
an I2C bus.
The CAT1163 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.
The 1.6-second watchdog circuit returns a system to a
known good state if a software or hardware glitch halts
or“hangs”thesystem.TheCAT1163watchdogmonitors
the WDI input pin.
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
Available packages include an 8-pin DIP and a surface
mount, 8-pin SO package.
BLOCK DIAGRAM
PIN CONFIGURATION
EXTERNAL LOAD
SENSE AMPS
SHIFT REGISTERS
D
V
OUT
WDI
CC
ACK
RESET
RESET
V
CC
CAT1163
WORD ADDRESS
BUFFERS
COLUMN
DECODERS
GND
SCL
SDA
WP
GND
START/STOP
LOGIC
SDA
EEPROM
XDEC
Reset Threshold Voltage Options
CONTROL
LOGIC
WP
Part Dash Minimum Maximum
Number Threshold Threshold
DATA IN STORAGE
-45
-42
-30
-28
-25
4.50
4.25
3.00
2.85
2.55
4.75
4.50
3.15
3.00
2.70
HIGH VOLTAGE/
TIMING CONTROL
RESET Controller
STATE COUNTERS
SCL
Precision
SLAVE
ADDRESS
COMPARATORS
WATCHDOG
Vcc Monitor
WDI RESET RESET
© 2002 by Catalyst Semiconductor, Inc.
Doc No. 3003, Rev. C
Characteristics subject to change without notice