© 2002 Microchip Technology Inc.

DS21384B-page 1

TC1278/TC1279

Features

• 250msec Minimum RESET Output Duration

• Small 3-Pin SOT-23B Package

• No External Components

Applications

• Computers

• Embedded Systems

• Battery Powered Equipment

• Critical

µP Power Supply Monitoring

Device Selection Table

Package Type

General Description

The TC1278/TC1279 are cost-effective system super-

and provide a reset signal to the host processor when

necessary. No external components are required.

The reset output is driven active within 5

falling through the reset voltage threshold. RESET is

rises above the reset threshold. The TC1278 has an

active-high RESET output while the TC1279 has an

active-low RESET output, and both devices have an

open drain output stage. The output is valid down to

23B package.

Typical Operating Circuit

Part

Number

Order

Package

Temp.

Range

TC1278-xENB

Open Drain

3-Pin SOT-23B

-40°C to +85°C

TC1279-xENB

Open Drain

3-Pin SOT-23B

-40°C to +85°C

Suffix

5

4.625

10

4.375

15

4.125

RESET

GND

TC1278-xENB

TC1279-xENB

1

2

3

NOTE: 3-Pin SOT-23B is equivalent to JEDEC TO-236

3-Pin SOT-23B

TC1279

RESET

RESET

Input

GND

GND

Processor

1

2

3

3-Pin Reset Monitors for 5V Systems