TC1274 datasheet(1/12 Pages) MICROCHIP

Part #	TC1274

Description	3-Pin Reset Monitors for 5V Systems

PDF	12 Pages

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Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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 2003 Microchip Technology Inc.

DS21382B-page 1

M

TC1272/TC1273/TC1274

Features

• Precision VCC Monitor for 5.0V Systems

• 100 msec Minimum RESET, RESET Output

Duration

• Output Valid to VCC = 1.2V

•VCC Transient Immunity

• Small 3-Pin SOT-23B Package

• No External Components

Applications

• Computers

• Embedded Systems

• Battery-Powered Equipment

• Critical µP Power Supply Monitoring

Package Type

General Description

The

TC1272/TC1273/TC1274

are

cost-effective

system supervisor circuits designed to monitor VCC in

digital systems and provide a reset signal to the host

processor when necessary. No external components

are required.

The reset output is driven active within 20 µsec of VCC

falling through the reset voltage threshold. RESET is

maintained active for a minimum of 100 msec after

VCC rises above the reset threshold. The TC1274 has

an active-high RESET output, while the TC1272 and

TC1273 have an active-low RESET output. The

TC1272 and TC1274 each have a complimentary out-

put, while the TC1273 has an open-drain output. The

output of the TC1272 and TC1273 is valid down to VCC

= 1.2V. The TC1274 is valid down to VCC = 1.8V. All

three devices are available in a 3-Pin SOT-23B

package.

The TC1272/TC1273/TC1274 devices are optimized to

reject fast transient glitches on the VCC line.

Typical Operating Circuit

VCC

RESET

**(RESET)

GND

TC1272

TC1273

TC1274

1

2

3

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

**( ) is for TC1274

3-Pin SOT-23B*

TC1272

VCC

RESET

Input

GND

Processor

1

2

3

3-Pin Reset Monitors for 5V Systems

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