CAT1163 (16K)
Supervisory Circuit with I
2
C Serial CMOS EEPROM, Precision Reset Controller and Watchdog Timer
FEATURES
s
Watchdog timer input (WDI)
s
400kHz I
2
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
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
— V
CC
lock out
— Write protect pin, WP
DESCRIPTION
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
protection and a watchdog timer are integrated together
in low power CMOS technology. Memory interface is via
an I
2
C 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 CAT1163 watchdog monitors
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
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 memory features a 16-byte page. In addition,
hardware data protection is provided by a write protect pin
WP and by a V
CC
sense circuit that prevents writes to
memory whenever V
CC
falls below the reset threshold or
until V
CC
reaches the reset threshold during power up.
Available packages include an 8-pin DIP and a surface
mount, 8-pin SO package.
PIN CONFIGURATION
WDI
RESET
WP
GND
VCC
RESET
SCL
SDA
BLOCK DIAGRAM
EXTERNAL LOAD
DOUT
ACK
VCC
GND
WORD ADDRESS
BUFFERS
COLUMN
DECODERS
SENSE AMPS
SHIFT REGISTERS
CAT1163
SDA
START/STOP
LOGIC
Reset Threshold Voltage Options
WP
XDEC
CONTROL
LOGIC
EEPROM
Part Dash Minimum
Number Threshold
-45
-42
-30
-28
-25
4.50
4.25
3.00
2.85
2.55
Maximum
Threshold
DATA IN STORAGE
4.75
4.50
3.15
3.00
2.70
WDI RESET
RESET
RESET Controller
WATCHDOG
HIGH VOLTAGE/
TIMING CONTROL
STATE COUNTERS
SLAVE
ADDRESS
COMPARATORS
SCL
Precision
Vcc Monitor
© 2002 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Doc No. 3003, Rev. C
CATALYST [ CATALYST SEMICONDUCTOR ]
