MIC1232NY

更新时间： 2024-11-29 10:57:27

品牌	Logo	应用领域
麦瑞 - MICREL		光电二极管监控
页数	文件大小	规格书
6页	145K
描述
μP Supervisory Circuit

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MIC1232NY 数据手册

MIC2755

Micrel, Inc.

MIC1232

µP Supervisory Circuit

General Description

Features

The MIC1232 is a multifunction circuit which monitors mi-

croprocessor activity, external reset and power supplies in

microprocessor based systems. The circuit functions include

awatchdogtime,powersupplymonitor,microprocessorreset,

and manual pushbutton reset input.

• Power OK/Reset time delay, 250ms min.

• Watchdog timer, 150ms, 600ms, or 1.2s typical

• Precision supply voltage monitor, select between 5% or

10% of supply voltage

• Available in 8-pin surface mount (SO)

• Debounced External reset input

The power supply line is monitored with a comparator and

an internal voltage reference. /RST is forced low when an

out-of-tolerance condition exists and remains asserted for

• Low supply current, <18µA typical

Applications

• Automotive systems

• Intelligent systems

• Critical microprocessor power monitoring

• Battery powered computers

• Controllers

at least 250ms after V rises above the threshold voltage

(4.5V or 4.75V). The /RST pin will remain logic low with V

as low as 1.4V.

The Watchdog input (/ST) monitors µP activity and will as-

sert /RST if no µP activity has occurred with in the watchdog

timeout period. The watchdog timeout period is selectable

with nominal period of 150, 600, 1200 milliseconds.

Ordering Information

Part Number

Temperature Range

Package

Standard

MIC1232N

MIC1232M

Pb-Free

MIC1232NY

MIC1232MY

–40ºC to +85ºC

8-Pin PDIP

8-Pin SOIC

Typical Application

MIC1232

µP

PBRST

RST

GND

I/O

RESET

TOL

Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

January 2006

MIC1232

12 3 4 5 6

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