1

®

FN8131.2

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

1-888-INTERSIL or 1-888-468-3774

Copyright Intersil Americas Inc. 2005, 2008. All Rights Reserved

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

X5323, X5325

(Replaces X25323, X25325)

CPU Supervisor with 32kBit SPI EEPROM

These devices combine four popular functions, Power-on

Reset Control, Watchdog Timer, 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 oscillator to stabilize

before the processor can execute code.

The Watchdog Timer provides an independent protection

mechanism for microcontrollers. When the microcontroller

fails to restart a timer within a selectable time out interval,

the device activates the RESET/RESET signal. The user

selects the interval from three preset values. Once selected,

the interval does not change, even after cycling the power.

system from low voltage conditions, resetting the system

thresholds are available, however, Intersil’s unique circuits

allow the threshold to be reprogrammed to meet custom

requirements or to fine-tune the threshold for applications

requiring higher precision.

Features

• Selectable watchdog timer

- Five standard reset threshold voltages

special programming sequence

• Determine watchdog or low voltage reset with a volatile

flag bit

• 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

• 32kbits 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 Block

- In circuit programmable ROM mode

• 2MHz SPI interface modes (0,0 and 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 Ld TSSOP, 8 Ld SOIC, 8 Ld PDIP

• Pb-free (RoHS compliant)

Block Diagram

WATCHDOG

TIMER RESET

DATA

REGISTER

COMMAND

DECODE AND

CONTROL

LOGIC

SI

SO

SCK

CS/WDI

RESET AND

WATCHDOG

TIMEBASE

POWER-ON AND

GENERATION

+

-

RESET/RESET

RESET

LOW VOLTAGE

STATUS

REGISTER

PROTECT LOGIC

8kBITS

8kBITS

16kBITS

WATCHDOG TRANSITION

DETECTOR

WP

X5323 = RESET

X5325 = RESET

RESET LOGIC

Data Sheet

June 30, 2008