MM1142XF Ver la hoja de datos (PDF) - Mitsumi

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MM1142XF

System Reset (with built-in watchdog timer)

Mitsumi 

MITSUMI

System Reset (with built-in watchdog timer) MM1142

System Reset (with built-in watchdog timer)

Monolithic IC MM1142

Outline

This IC was developed to drive low voltage batteries, and has a watchdog timer with built-in microcomputer

reset voltage detection circuit and low battery detection circuit.

A single reference voltage is used for low battery voltage detection and microcomputer reset voltage

detection, so detection voltage difference is uniform (.=. 0.2V). Further, there is a built-in watchdog timer for

operation diagnosis, which prevents the system from running wild by generating an intermittent reset pulse

during system mis-operation.

Features

1. Accurate voltage drop detection voltage

1. Low battery detection

2.2V±3%

2. Power supply voltage detection

2.0V±3%

3. Detection voltage error

0.2V±20mV 1-2

4. Hysteresis

both 50mV typ.

2. Watchdog function stop pin (can be made to function only as reset IC during VCC rise)

3. Low current consumption

150µA typ.

Package

SOP-8C (MM1142XF)

Applications

1. 2V cordless telephones

2. Portable communication equipment

3. Various types of small, handy equipment

Series Table

Model

MM1142

VSLB

2.2V

VSLR

2.0V

TPR : Reset hold time during Vcc rise

TWD : Timer monitoring time

TWR : Reset time

VSLB: Battery check detection voltage

VSLR: Reset detection voltage

TPR

100mS

TWD

100mS

TWR

2mS

*CT=0.02µF

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