MITSMI MM1135XF, MM1136XF Datasheet

Model VSLB VSLR TPR TWD TWR

MM1135 100mS 10mS 2mS

MM1136

3.4V 3.2V
100mS 100mS 2mS

MITSUMI

System Reset (with built-in watchdog timer) MM1135, MM1136

System Reset (with built-in watchdog timer)

Monolithic IC MM1135, MM1136

Outline

These ICs were developed to drive low voltage batteries, and have 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 3.4V±3%

2. Power supply voltage detection 3.2V±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 V

CC rise)

3. Low current consumption 150µA typ.

Package

SOP-8C (MM1135XF, MM1136XF)

Series Table

Applications

1. 3V cordless telephones

2. Various types of small, handy equipment

*

CT=0.02µF

T

PR : Reset hold time during VCC rise

T

WD : Timer monitoring time

T

WR : Reset time

V

SLB : Battery check detection voltage

V

SLR : Reset detection voltage

MITSUMI

System Reset (with built-in watchdog timer) MM1135, MM1136

Pin Assignment

1432

8567

SOP-8C

1 TC

2

BC (RESET

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)

3 CK

4 GND

5 V

CC

6 RCT

7 V

S

8

RESET

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Pin Description

Pin No. Pin name Function

1 TC T

WD, TWR, TPR time setting pins.

2 BC (

RESET

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) Battery check output pin (RESET low level output) for 3.4V

3 CK Clock input pin

4 GND GND pin

5 V

CC Power supply voltage input pin

6 RCT

Watchdog timer stop pin

Operation OPEN, Stop connect to GND

7 V

S Detection voltage fine adjustment pin

8

RESET

----------------------------------------------------------------------------------------

Reset output pin (low output)

Block Diagram