1

®

FN8114.0

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.

PRELIMINARY

X40030, X40031, X40034, X40035

Triple Voltage Monitor with Integrated

CPU Supervisor

FEATURES

• Triple voltage detection and reset assertion

—Standard reset threshold settings

See selection table on page 2.

—Adjust low voltage reset threshold voltages

using special programming sequence

—Monitor three seperate voltages

• Fault detection register

• Selectable power on reset timeout

(0.05s, 0.2s, 0.4s, 0.8s)

• Selectable watchdog timer interval

(25ms, 200ms, 1.4s or off)

• Debounced manual reset input

• Low power CMOS

—25µA typical standby current, watchdog on

—6µA typical standby current, watchdog off

• 400kHz 2-wire interface

• 2.7V to 5.5V power supply operation

• Available packages

—14-lead SOIC, TSSOP

• Monitor Voltages: 5V to 0.9V

• Independent Core Voltage Monitor

APPLICATIONS

• Communication Equipment

—Routers, Hubs, Switches

—Disk arrays, Network Storage

• Industrial Systems

—Process Control

—Intelligent Instrumentation

• Computer Systems

—Computers

—Network Servers

DESCRIPTION

The X40030, X40031, X40034, X40035 combines

power-on reset control, watchdog timer, supply voltage

supervision, second and third voltage supervision, and

manual reset, in one package. This combination lowers

system cost, reduces board space requirements, and

increases reliability.

circuit which holds RESET/RESET active for a period of

time. This allows the power supply and system oscilla-

tor to stabilize before the processor can execute code.

from low voltage conditions, resetting the system

operating level and stabilizes. A second and third volt-

age monitor circuit tracks the unregulated supply to

provide a power fail warning or monitors different

power supply voltage. Three common low voltage

combinations are available, however, Intersil’s unique

circuits allows the threshold for either voltage monitor

to be reprogrammed to meet specific system level

requirements or to fine-tune the threshold for applica-

BLOCK DIAGRAM

V3FAIL

V2FAIL

WDO

MR

LOWLINE

RESET

RESET

X40030/34

X40031/35

V3 Monitor

Logic

V2 Monitor

Logic

Fault Detection

Register

Status

Register

Data

Register

Command

Decode Test

& Control

Logic

Power on,

Manual Reset

Low Voltage

Reset

Generation

Logic

V3MON

V2MON

SDA

WP

SCL

(V1MON)

Watchdog

and

Reset Logic

+

-

+

-

+

-

V2MON*

Data Sheet

April 28, 2005