MicroPower Microprocessor Reset Circuit with Manual Reset

Copyright  ANPEC Electronics Corp.

Rev. A.3 - Feb., 2004

APR3101/2/3

www.anpec.com.tw

1

ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise

customers to obtain the latest version of relevant information to verify before placing orders.

Features

General Description

Applications

•••••

1.2V to 6V Input Voltage Range

•••••

Low Quiescent Current : less Than 1.5

µA

•••••

High accuracy detection threshold : ±1.5%

•••••

Fixed trimmed reset thresholds for 1.5V, 1.75V,

2.32V, 2.63V, 2.93V, 3.08V, 3.9V, 4.38V.

•••••

Manual Reset Input

•••••

Reset Timeout Period 250ms

•••••

Available output configurations

- Open-drain output

- CMOS active high output

- CMOS active low output

•••••

SOT-23-5 package

•••••

No external components

Pin Configuration

The APR3101/2/3 are designed to monitor voltage

supplies in

µP and digital systems. The quiescent

current is extremely low, typically 1.5

µA, making it

ideal for portable battery operated equipment. The

APR3101/2/3 operate by monitoring the system power

supply voltage. When the input voltage drops below a

fixed threshold or whenever manual reset is asserted,

the device asserts a reset signal for a fixed time pe-

riod after Vcc rises above the fixed threshold or manual

reset is deasserted. The APR3101/2/3 series is avail-

able with three output stage versions:APR3101 push-

pull active low output, APR3102 push-pull active high

output and APR3103 open drain active low output. The

APR3101/2/3 also have a debounced manual reset

input that is provided to override the reset monitor.

They are also designed to reject fast line transient

glitches on Vcc. The APR3101/2/3 are come in a

miniature SOT-23-5 package.

NC

GND

MR

12

3

4

5

(3101/3)

(3102)

Reset

Reset

SOT-23-5 (Top View)