MB3793-37A Datasheet, PDF (17/21 Pages) Fujitsu Component Limited. – Power Voltage Monitoring IC with Watchdog Timer

MB3793-37A
s TYPICAL APPLICATION
VCC
CTW* CTP*
2 CTW
5
VCC
RESET 1
MB3793
3 CTP
CK1 8
6 INH GND CK2 7
4
GND
* : Use a capacitor with less leakage current.
RESET VCC
Microprocessor 1
CK
GND
RESET VCC
Microprocessor 2
CK
GND
1. Equation of time-setting capacitances (CTP and CTW) and set time
tPR [ms] ^.=. A × CTP [µF]
tWD [ms] ^.=. B × CTW [µF] + C × CTP [µF]
However, when
CTP
CTW
≤
about
10,
tWD
[ms]
._=.
B × CTW [µF]
tWR [ms] ^.=. D × CTP [µF]
Values of A, B, C, and D
A
B
C
1300
1500
0
D
Remark
100
VCC = 5.0 V
2. (Example) when CTP = 0.1 µF and CTW = 0.01 µF
tPR
time
(msec)
tWD
tWR
._{=. 130}
._{=. 15}
._{=. 10}
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