CAT1163
Supervisory Circuits with I2C Serial CMOS EEPROM,
Precision Reset Controller and Watchdog Timer (16K)
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.
FEATURES
Watchdog timer input (WDI)
400kHz I2C bus compatible
2.7V to 6.0V operation
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 CAT1163 watchdog
monitors the WDI input pin.
Low power CMOS technology
16-Byte page write buffer
Built-in inadvertent write protection
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—
VCC lock out
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 200ms 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.
Write protect pin, WP
Active high or low reset
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—
—
Precision power supply voltage monitor
5V, 3.3V and 3V systems
Five threshold voltage options
1,000,000 Program/Erase cycles
Manual reset
100 Year data retention
8-pin DIP or 8-pin SOIC
Commercial and industrial temperature ranges
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.
For Ordering Information details, see page 13.
DESCRIPTION
The CAT1163 is a complete memory and supervisory
solution for microcontroller-based systems. A serial
Available packages include an 8-pin DIP and a
surface mount, 8-pin SO package.
PIN CONFIGURATION
PIN FUNCTIONS
PDIP 8 Lead
SOIC 8 Lead
Pin Name Function
WDI
Warchdog Timer Input
Active Low Reset I/O
Write Protect
WDI
1
2
3
4
8
7
6
5
VCC
¯¯¯¯¯¯
RESET
¯¯¯¯¯¯
RESET
RESET
SCL
WP
GND
SDA
CAT1163
WP
Ground
GND
SDA
Serial Data/Address
Clock Input
SCL
RESET
VCC
Active High Reset I/O
Power Supply
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
1
Doc. No. MD-3003 Rev. I