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MM1145BF

System Reset (with built-in watchdog timer)

Mitsumi 

MITSUMI

System Reset (with built-in watchdog timer) MM1145

System Reset (with built-in watchdog timer)

Monolithic IC MM1145

Outline

This IC has a built-in watchdog timer, with 2 channels for a clock monitoring function that monitors the

microcomputer and outputs an intermittent reset signal if the microcomputer runs wild. Also, it has a power

supply voltage monitoring function (system reset function) which generates a reset signal if power supply

voltage is momentarily interrupted or drops, and performs power ON reset during normal power supply

recovery and when power is turned on.

Features

1. Built-in edge trigger input watchdog timer

2. 2 clock pulse monitoring

3. Power ON reset time (TPR) and watchdog timer monitoring time (TWD) can be set individually with external

elements (R, C)

4. Excellent watchdog timer monitoring time (TWD) precision A type : ±20%

B type : ±30%

5. Watchdog function stop pin allows use as system reset IC

6. Accurate power supply voltage drop detection

4.2V±3.5%

7. Detection voltage has hysteresis

100mV typ. ±0.14%/°C

8. Low reset minimum voltage

9. Low current consumption

150µA typ.

Package

SOP-8C (MM1145AF, MM1145BF)

Applications

Voltage detection for CPUs, microcomputers, etc. and clock pulse monitoring

Series Table

Model

VSL

MM1145A

4.2

MM1145B

VSL : Reset detection voltage

TPR : Reset hold time during Vcc rise

TWD : Watchdog timer monitoring time

TWR : Reset time

TPR

100ms

40ms

TWD

TWR

50ms

10ms

110ms

10ms

*CT=0.02µF, RCT=1MΩ

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