X40626V14I Xicor, X40626V14I Datasheet

X40626V14I

Manufacturer Part Number

X40626V14I

Description

Dual Voltage CPU Supervisor with 64K Serial EEPROM

Manufacturer

Xicor

Datasheet

1.X40626V14I.pdf (23 pages)

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Preliminary Information

64K

FEATURES

• Dual voltage monitoring

• Watchdog timer with selectable timeout intervals

• Low V

• Low power CMOS

• 64Kbits of EEPROM

• Built-in inadvertent write protection

• 400kHz 2-wire interface

• 2.7V to 5.5V power supply operation

• Available Packages

BLOCK DIAGRAM

REV 1.1.15 2/11/04

—V

—Four standard reset threshold voltages

—User programmable V

—Reset signal valid to V

—20µA max standby current, watchdog on

—1µA standby current, watchdog OFF

—64 byte page size

—Power-up/power-down protection circuitry

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

—Slave addressing supports up to 4 devices on

—14-lead SOIC

—14-lead TSSOP

bytes of EEPROM array with programmable

Block Lock

the same bus

2Mon

V2MON

SDA

SCL

operates independent of V

detection and reset assertion

™

Dual Voltage CPU Supervisor with 64K Serial EEPROM

protection

TRIP

Reset logic

Command

Decode &

Control

Data

Logic

Threshold

=1V

threshold

Watchdog Transition

Detector

V2 Monitor

TRIP

Logic

www.xicor.com

X40626

Protect Logic

EEPROM

64KB

Status

Array

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 protection

mechanism for microcontrollers. When the microcontrol-

ler 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.

The device’s low V

user’s system from low voltage conditions, resetting the

system when V

point. RESET is asserted until V

TRIP2

Power on and

Timer Reset

Low Voltage

Watchdog

Generation

Watchdog

Timebase

Reset &

Reset

Characteristics subject to change without notice.

falls below the set minimum V

detection circuitry protects the

returns to proper

8K x 8 Bit

V2FAIL

RESET

1 of 23

trip

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