CAT1161LI-25-GT3 CATALYST [Catalyst Semiconductor], CAT1161LI-25-GT3 Datasheet

CAT1161LI-25-GT3

Manufacturer Part Number

CAT1161LI-25-GT3

Description

Supervisory Circuits with I2C Serial CMOS EEPROM, Precision Reset Controller and Watchdog Timer (16K)

Manufacturer

CATALYST [Catalyst Semiconductor]

Datasheet

1.CAT1161LI-25-GT3.pdf (14 pages)

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Supervisory Circuits with I

Precision Reset Controller and Watchdog Timer (16K)

FEATURES

DESCRIPTION

The CAT1161/2 is a complete memory and supervi-

sory solution for microcontroller-based systems. A se-

rial EEPROM memory (16K) with hardware memory

write protection, a system power supervisor with

PIN CONFIGURATION

Characteristics subject to change without notice

For Ordering Information details, see page 13.

Watchdog monitors SDA signal (CAT1161)

400kHz I

2.7V to 6.0V operation

Low power CMOS technology

16-Byte page write buffer

Built-in inadvertent write protection

Active high or low reset

1,000,000 Program/Erase cycles

Manual Reset

100 Year data retention

8-pin DIP or 8-pin SOIC

Commercial and industrial temperature ranges

—

Write protect pin, WP

Precision power supply voltage monitor

5V, 3.3V and 3V systems

Five threshold voltage options

¯¯¯¯¯¯

RESET

lock out

C bus compatible

GND 4

WP 3

DC 1

SOIC 8 Lead

PDIP 8 Lead

CAT1161

CAT1162

8 V

7 RESET

6 SCL

5 SDA

C Serial CMOS EEPROM,

brown out protection and a watchdog timer are

integrated together in low power CMOS technology.

Memory interface is via an I

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 CAT1161 watchdog

monitors the SDA line, making an additional PC board

trace unnecessary. The lower cost CAT1162 does not

have a watchdog timer.

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 a debounced input for push-

button manual reset capability.

The CAT1161/2 memory features a 16-byte page. In

addition, hardware data protection is provided by a

write protect pin WP and by a V

prevents writes to memory whenever V

the reset threshold or until V

threshold during power up.

Available packages include an 8-pin DIP and a

surface mount, 8-pin SO package.

PIN FUNCTIONS

Pin Name

¯¯¯¯¯¯

RESET

GND

SDA

SCL

Function

Do not Connect

Active Low Reset I/O

Write Protect

Ground

Serial Data/Address

Clock Input

Active High Reset I/O

Power Supply

CAT1161, CAT1162

C bus.

reaches the reset

sense circuit that

Doc. No. MD-3002 Rev. G

falls below

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