 2002 Microchip Technology Inc.

DS21615B-page 1

Features

• Precision V

5.0V Nominal Supplies

• Manual Reset Input

• 140 msec Minimum RESET Output Duration

• RESET Output Valid to V

• Low 6 µA (typ.) Supply Current

•V

• Small 4-Pin SOT-143 Package

• No External Components

• Replacement for MAX811/812 and Offers a Lower

Threshold Voltage Option

• Push-Pull RESET Output

• Temperature Range:

- Commercial (C) -40°C to +85°C

Applications

• Computers

• Embedded Systems

• Battery Powered Equipment

• Critical Microcontroller Power Supply Monitoring

Typical Application Circuit

General Description

The TCM811 and TCM812 are cost effective system

supervisory circuits designed to monitor V

systems and provide a reset signal to the host control-

ler when necessary. A manual reset input is provided

to override the reset monitor and is suitable for use as

a push-button reset. No external components are

required.

The reset output is driven active within 20 µsec (5 µsec

for F version) of V

threshold. RESET is maintained active for a minimum

of 140 msec after V

The TCM812 has an active high RESET output while

the TCM811 has an active low RESET output. The out-

put of the TCM811 is valid down to V

devices are available in a 4-Pin SOT-143 package,

specified with a temperature range of -40°C to +85°C.

The TCM811/TCM812 are optimized to reject fast tran-

sient glitches on the V

6µA (V

powered applications.

Package Types:

TCM811

V

DD

V

DD

V

DD

RESET

RESET

INPUT

(Active Low)

GND

GND

MR

PUSH

BUTTON

PIC

Microcontroller

4

3

2

0.1µF

V

DD

TCM811 RESET

GND 1

2

TCM812 (RESET)

3

4

MR

SOT-143

4-Pin Microcontroller Reset Monitors