1

®

FN8127.2

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

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Copyright Intersil Americas Inc. 2005. All Rights Reserved

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X5083

CPU Supervisor with 8Kbit SPI EEPROM

This device combines four popular functions, Power-on Reset

Control, Watchdog Timer, Supply Voltage Supervision, and

Block Lock 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 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 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

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.

Pinouts

8 Ld TSSOP

8 Ld SOIC, 8 Ld PDIP

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

- <1µA max standby current, watchdog off

- <400µA max active current during read

• 8Kbits of EEPROM

- Block lock first or last page, any 1/4 or lower 1/2 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)

• SPI modes (0,0 & 1,1)

• Available packages

- 8 Ld TSSOP, 8 Ld SOIC, 8 Ld PDIP

• 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

SCK

SI

WP

CS/WDI

SO

1

2

3

4

8

7

6

5

X5083

RESET

X5083

CS/WDI

WP

SO

1

2

3

4

RESET

8

7

6

5

SCK

SI

Data Sheet

September 16, 2005