MM1075 Datasheet, PDF (7/10 Pages) Mitsumi Electronics, Corp. – System Reset (with built-in watchdog timer) Monolithic IC

MITSUMI
System Reset (with built-in watchdog timer) MM1075
Measuring Circuit 2-2 ^{SW & Power Supply Table}
Item
Symbol SW1 SW2
VCC input pulse width TPI C
5V
B
4V
CK input pulse width TCKW A B
VCCA
T1
-
CK input cycle
TCK A B
-
Watchdog timer
TWD A A
-
monitoring time
Reset time for
TWR A A
-
watchdog timer
Reset hold time for
TPR B A A
-
power supply rise
TPD1 C
Output delay time
5V
A
0V
from VCC
TPD2 C
5V
A
0V
TR1 A A
-
Output rise time
TR2 A A
-
TP1 A A
-
Output fall time
TP2 A A
-
VCC
1.4V
-
0V
1.4V
5V
0V
1.4V
5V
0V
5V
5V
5V
-
-
5V
5V
5V
5V
VCKA
T2
T2
or
T2
VCK CRT
Notes
T3
- CRT1, 2, 3 T1=8µS
- CRT1, 2, 3 T2=3µS
T2
T3
- CRT1, 2, 3 T3=20µS
-
5V CRT1, 2, 3
-
5V CRT1, 2, 3
-
5V CRT1, 2, 3
-
0V CRT1, 3
-
0V CRT2, 3
-
5V CRT1
-
5V CRT2
-
5V CRT1
-
5V CRT2
Detection Voltage Adjustment 1 ^{(lowering detection voltage)}
Graph 1. Detection voltage change using MM1075
external resistor
5.0
Detection voltage can be changed by
connecting resistor R2 externally to
MM1075 VS pin. Determine R2 according to
graph 1 when changing VS.
VSH value
4.5
VSL value
100 200 300 400 500 600
Vs pin external resistance
(R2) (kΩ)