MB3771
6. 5 V Power Supply Monitor with forced RESET input (VCC = 5 V)
RESIN is an TTL compatible input.
RESIN
VCC
MB3771
1
8
RESET
2
3
4
7
6
5
CT
Logic Circuit
7. 5 V Power Supply Monitor with Non-inverted RESET
In this case, Comparator C is used to invert RESET signal. OUTC is an open-collector output.
RL is used an a pull-up resistor.
VCC
MB3771
RL: 10 kΩ
1
2
3
4
8
7
6
5
CT
RESET
8. Supply Voltage Monitoring with Delayed Trigger
When the voltage shown in the diagram below is applied at VCC, the minimum value of the input pulse width is
increased to 40 µs (when C1 = 1000 pF).
The formula for calculating the minimum value of the input pulse width [TPI] is:
TPI [µs]=: 4 × 10-2 × C1 [pF]
TP
VCC 5 V
4 V
MB3771
1
2
3
4
8
RESET
7
6
5
CT
C1
10
FUJITSU [ FUJITSU ]
