1

®

FN8119.0

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 1-888-352-6832

Copyright Intersil Americas Inc. 2005. All Rights Reserved

All other trademarks mentioned are the property of their respective owners.

PRELIMINARY

X40626

64K, 8K x 8 Bit

Dual Voltage CPU Supervisor with 64K

Serial EEPROM

FEATURES

• Dual voltage monitoring

• Watchdog timer with selectable timeout intervals

—Four standard reset threshold voltages

• Low power CMOS

—20µA max standby current, watchdog on

—1µA standby current, watchdog OFF

• 64Kbits of EEPROM

—64 byte page size

• Built-in inadvertent write protection

—Power-up/power-down protection circuitry

—Protect 0, 1/4, 1/2, all or 64, 128, 256 or 512

bytes of EEPROM array with programmable

• 400kHz 2-wire interface

—Slave addressing supports up to 4 devices on

the same bus

• 2.7V to 5.5V power supply operation

• Available Packages

—14-lead SOIC

—14-lead TSSOP

DESCRIPTION

The X40626 combines four popular functions, Power-on

Reset Control, Watchdog Timer, Dual Supply Voltage

Supervision, and Serial EEPROM Memory in one pack-

age. This combination lowers system cost, reduces

board space requirements, and increases reliability.

Applying power to the device activates the power-on

reset circuit which holds RESET active for a period of

time. This allows the power supply and oscillator to stabi-

lize before the processor can execute code.

The Watchdog Timer provides an independent protec-

tion mechanism for microcontrollers. When the micro-

controller fails to restart a timer within a selectable time-

out interval, the device activates the RESET signal. The

user selects the interval from three preset values. Once

selected, the interval does not change, even after cycling

the power.

BLOCK DIAGRAM

Watchdog

Timer Reset

Data

Register

Command

Decode &

Control

Logic

SDA

SCL

Reset &

Watchdog

Timebase

Power-on and

Generation

+

-

RESET

Reset

Low Voltage

Status

Register

Protect Logic

64KB

Watchdog Transition

Detector

WP

Reset logic

S0

S1

V2 Monitor

Logic

+

-

V2MON

V2FAIL

EEPROM

Array

Data Sheet

March 28, 2005