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MM1142 Datasheet

  • MM1142

  • System Reset (with built-in watchdog timer)

  • 136.32KB

  • 5頁(yè)

  • MITSUMI   MITSUMI

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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鹵3%
2. Power supply voltage detection
2.0V鹵3%
3. Detection voltage error
0.2V鹵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
150碌A(chǔ) 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
T
PR
:
T
WD
:
T
WR
:
V
SLB
:
V
SLR
:
V
SLB
2.2V
V
SLR
2.0V
T
PR
100mS
T
WD
100mS
T
WR
2mS
Reset hold time during Vcc rise
Timer monitoring time
Reset time
Battery check detection voltage
Reset detection voltage
*
C =0.02碌F
T

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