System Reset (with built-in watchdog timer) Monolithic IC - MITSUMI
Description
MITSUMI
System Reset (with built-in watchdog timer) MM1075
System Reset (with built-in watchdog timer)
Monolithic IC MM1075
Outline
This IC functions in a variety of CPU systems and other logic systems to generate a reset signal and reset the system accurately during momentary interruption or lowering of power supply voltage.
It also has a built-in watchdog timer for operation diagnosis.
This prevents the system from running wild by generating an intermittent reset pulse during system mis-operation.
Features
1.
2.
3.
4.
5.
6.
7.
Built-in watchdog timer Low minimum operating voltage VCC=0.
8V typ.
Both positive and negative logic reset output can be extracted Accurate detection of drop in power supply voltage Detection voltage has hysteresis Few external parts 1 capacitor Timer monitoring time can be varied by using an external resistor
Package
DIP-8A (MM1075XD) SOP-8A (MM1075XF)
Applications
Microcomputer system monitoring, etc.
Absolute Maximum Ratings
Item Storage temperature Operating temperature Power supply voltage
(Ta=25°C) Symbol TSTG TOPR VCC max.
VVS &VCK VOH Pd Rating -40~+125 -20~+70 -0.
3~+10 -0.
3~+10 -0.
3~+10 400 Units
°C °C
V V V mW
Voltage applied to VS & CK pins Voltage applied to RESET, RESET pin Allowable loss
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MITSUMI
System Reset (with built-in watchdog timer) MM1075
Electrical Characteristics (DC)
Item Consumption current Detection voltage Detection voltage temperature coefficient Hysteresis voltage CK input threshold CK input current Symbol ICC VSL VSH VS/ T VHYS VTH IIH IIL VOH1 VOH2 VOL1 Output voltage (Low) VOL2 VOL3 VOL4 Output sink current IOL1 IOL2 ICT1 CT charge current 1
(Except where noted otherwise, Ta=25°C, VCC=5V)
Measurement circuit 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
Measurement conditions During watchdog timer operation VS=OPEN, VCC VS=OPEN, VCC
Min.
Typ.
Max.
Units 0.
7 4.
05 4.
15 4.
20 4.
30 ±0.
01 1.
0 4.
35 4.
45 mA V %/°C 150 2 1 -3 mV V µA V 0.
4 0.
5 0.
4 0.
5 mA -2.
4 -2.
4 1.
0 1.
0 µA µA V V V
VSH-VSL, VCC VCK=5V V...
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