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PDF MM1142 Data sheet ( Hoja de datos )
| Número de pieza | MM1142 | |
| Descripción | System Reset | |
| Fabricantes | Mitsumi Electronics | |
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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
TPR : Reset hold time during Vcc rise
TWD : Timer monitoring time
TWR : Reset time
VSLB: Battery check detection voltage
VSLR: Reset detection voltage
VSLR
2.0V
TPR
100mS
TWD
100mS
TWR
2mS
*CT=0.02µF
1 page  
MITSUMI
Measuring Circuit
System Reset (with built-in watchdog timer) MM1142
Timing Chart
VCC
VSHB
VSLB
VSHR
VSLR
0.8V
CK
CT
RESET
BC
RCT
TCKW
TCK
TPR TWR TWD
OPEN
5 Page | ||
| Páginas | Total 5 Páginas | |
| PDF Descargar | [ Datasheet MM1142.PDF ] | |
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