1

®

FN8151.0

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

1-888-INTERSIL or 321-724-7143

Copyright Intersil Americas Inc. 2005. All Rights Reserved

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

PRELIMINARY

X80120, X80121

Voltage Supervisor/Sequencer

Dual Programmable Time Delay with

Local/Remote Voltage Monitors

The X80120 is a voltage supervisor/sequencer with two built

in voltage monitors. This allows the designer to monitor up to

two voltages and sequence up to three events.

Low voltage detection circuitry protects the system from

power supply failure or “brown out” conditions, resetting the

system and resequencing the voltages when any of the

monitored inputs fall below the minimum threshold level. The

RESET pin is active until all monitored voltages reach proper

operating levels and stabilize for a selectable period of time.

Five common low voltage combinations are available,

however, Intersil’s unique circuits allow the any voltage

monitor threshold to be reprogrammed for special needs or

for applications requiring higher precision.

A manual reset input provides debounce circuitry for

minimum reset component count. Activating the manual

reset both controls the RESET output and resequences the

supplies through control of the ViGDO pins.

The X80120 has 2kb of EEPROM for system configuration,

manufacturing or maintenance information. This memory is

protected to prevent inadvertent changes to the contents.

Pinout

Features

• Dual Voltage Monitor and Sequencing

- Two independent voltage monitors

- Two time delay circuits (in circuit programmable)

- Remote delay via SMBus

- Programmable voltage thresholds and delay times

- Sequence up to 3 power supplies.

• Fault Detection Register

- Remote diagnostics of voltage fail event.

• Debounced Manual Reset Input

• Manufacturing/Configuration Memory

- 2Kbits of EEPROM

- 400kHz SMBus interface

• Available Packages

- 20-lead Quad No-Lead Frame (QFN - 5x5mm)

Applications

• General Purpose Timers

• Long Time Delay Generation

• Cycle Timers / Waveform Generation

• ON/OFF Delay Timers

• Supply Sequencing for Distributed Power

• Programmable Delay Event Sequencing

• Multiple DC-DC ON/OFF Sequencing

• Voltage Window Monitoring with Reset

• ON/OFF switches with Programmable Delay

• Voltage Supervisor with Programmable Output Delays

• Databus Power Sequencing

• 100ms to 5 secs Selectable Delay Switches

• ATE or Data Acquisition Timing Applications

• Datapath/Memory Timing Applications

• Data Pipeline Timing Applications

• Batch Timer/Sequencers

• Adjustable Duty Cycle Applications

QFN PACKAGE

(Top view)

V1GDO

DNC

DNC

V4MON

V1MON

RESET

WP

V4GDO

SCL

1

2

3

4

5

67

18

19

20

8

17

(5mm x 5mm)

910

11

12

14

15

16

13

Ordering Information

PART

NUMBER

PACKAGE

X80120Q20I

4.5

0.9

QFN

X80121Q20I

3.0

0.9

QFN

Data Sheet

January 20, 2005