1

®

FN8126.2

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, 2006. All Rights Reserved

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

X5043, X5045

4K, 512 x 8 Bit

CPU Supervisor with 4K 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 executes 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.

The memory portion of the device is a CMOS Serial

EEPROM array with Intersil’s block lock protection. The

array is internally organized as 512 x 8. The device features

a Serial Peripheral Interface (SPI) and software protocol

allowing operation on a simple four-wire bus.

providing a minimum endurance of 100,000 cycles and a

minimum data retention of 100 years.

Features

- Four standard reset threshold voltages

4.63V, 4.38V, 2.93V, 2.63V

special programming sequence.

• Selectable Time Out Watchdog Timer

• Long Battery Life with Low Power Consumption

- <50µA max standby current, watchdog on

- <10µA max standby current, watchdog off

• 4Kbits of EEPROM–1M Write Cycle Endurance

- Protect 1/4, 1/2, all or none of EEPROM array

• Built-in Inadvertent Write Protection

- Write enable latch

- Write protect pin

• SPI Interface - 3.3MHz Clock Rate

• Minimize Programming Time

- 16-byte page write mode

- 5ms write cycle time (typical)

• Available Packages

- 8 Ld MSOP, 8 Ld SOIC, 8 Ld PDIP

- 14 Ld TSSOP

• Pb-Free Plus Anneal Available (RoHS Compliant)

Applications

• Communications Equipment

- Routers, Hubs, Switches

- Set Top Boxes

• Industrial Systems

- Process Control

- Intelligent Instrumentation

• Computer Systems

- Desktop Computers

- Network Servers

• Battery Powered Equipment

Data Sheet

March 16, 2006