MB3793-27A Datasheet, PDF (21/30 Pages) Fujitsu Component Limited. – Power Voltage Monitoring IC with Watchdog Timer

MB3793-27A
12. Typical Application
VCC
CTW* CTP*
2 CTW
5
VCC
RESET 1
MB3793
3 CTP
CK1 8
6 INH GND CK2 7
4
RESET VCC
Microprocessor 1
CK
GND
GND
*: Use a capacitor with less leakage current.
RESET VCC
Microprocessor 2
CK
GND
1. Equation of time-setting capacitances (C_TP and C_TW) and set time
t_PR [ms] ^.=. A  C_TP [F]
t_WD [ms] ^.=. B  C_TW [F]
t_WR [ms] ^.=. D  C_TP [F]
Values of A, B, C, and D
A
B
C
750
1600
0
700
1600
0
D
Remark
55
V_CC = 3.3 V
50
V_CC = 3.0 V
2. Example (when C_TP = 0.1 F and C_TW = 0.01 F)
time
(ms)
Symbol
t_PR
t_WD
t_WR
V_CC = 3.3 V
._{=. 75}
._{=. 16}
._{=. 5.5}
V_CC = 3.0 V
._{=. 70}
._{=. 16}
._{=. 5}
Document Number: 002-08550 Rev. *A
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