1

®

FN8136.0

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.

X5648, X5649

(Replaces X25648, X25649)

CPU Supervisor with 64Kbit SPI EEPROM

FEATURES

—Five standard reset threshold voltages

using special programming sequence

• Long battery life with low power consumption

—<50µA max standby current, watchdog on

—<1µA max standby current, watchdog off

—<400µA max active current during read

• 64Kbits of EEPROM

• Built-in inadvertent write protection

—Power-up/power-down protection circuitry

—Protect 0, 1/4, 1/2 or all of EEPROM array with

—In circuit programmable ROM mode

• 2MHz SPI interface modes (0,0 & 1,1)

• Minimize EEPROM programming time

—32-byte page write mode

—Self-timed write cycle

—5ms write cycle time (typical)

• 2.7V to 5.5V and 4.5V to 5.5V power supply

operation

• Available packages

—14-lead SOIC, 8-lead PDIP

DESCRIPTION

These devices combine three popular functions, Power-

on Reset Control, Supply Voltage Supervision, and Block

Lock Protect Serial EEPROM Memory in one package.

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/RESET active for a

period of time. This allows the power supply and oscilla-

tor to stabilize before the processor can execute code.

user’s system from low voltage conditions by holding

industry

standard

however, Intersil’s unique circuits allow the threshold to

be reprogrammed to meet custom requirements or to

fine-tune the threshold in applications requiring higher

precision.

BLOCK DIAGRAM

Data

Register

Command

Decode &

Control

Logic

SI

SO

SCK

CS

Reset

Timebase

Power-on and

Generation

+

-

RESET/RESET

Reset

Low Voltage

Status

Register

Protect Logic

16Kbits

16Kbits

32Kbits

WP

X5648 = RESET

X5649 = RESET

Data Sheet

March 17, 2005