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MB3773
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APPLICATION CIRCUIT
EXAMPLE 1: Monitoring 5V Supply Voltage and Watchdog Timer
VCC (5V)
MB3773
RESET
RESET
CK
GND
Logic circuit
Notes : • Supply voltage is monitored using VS.
• Detection voltage are V
SH and VSL.
C
T
1
2
3
4
8
7
6
5
EXAMPLE 2: 5V Supply Voltage Monitoring (external fine-tuning type)
VCC (5V)
1
2
3
4
8
7
6
5
MB3773
RESET
RESET
CK
GND
Logic circuit
Notes : • Vs detection voltage can be adjusted externally.
• Based on selecting R
1 and R2 values that are sufficiently lower than the resistance of the IC’s
internal voltage divider, the detection voltage can be set according to the resistance ratio of
R
1 and R2 (See the table below.)
R1
R2
CT
R
1
(k
Ω
ΩΩ
Ω
)R
2
(k
Ω
ΩΩ
Ω
) Detection voltage: V
SL
(V) Detection voltage: V
SH
(V)
10 3.9 4.4 4.5
9.1 3.9 4.1 4.2