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MB3773
EXAMPLE 5: Monitoring Two Supply Voltages (with hysteresis and reset output)
V
(12 V)
CC2
V
(5 V)
CC
1
C
T
Example : Comp. 1, Comp. 2
: MB4204, MB47393
Notes : When either 5 V or 12 V supply voltage decreases below its detection voltage (V
the MB3773 RESET terminal is set to High and the MB3773 RESET terminal is set to Low.
Use V
CC1
above.
The detection voltage of the V
hysteresis width of approximately 0.2 V. For the formulas for finding hysteresis width and detection
voltage, see section 4.
16
MB3773
1
8
2
7
3
6
4
5
1.2 k
R
1
5.1 k
R
2
(
5 V) to power the comparators (Comp. 1 and Comp. 2) in the external circuit shown
(
CC2
30 k
Diode
R
3
180 k
R
4
+
+
_
_
Comp. 1
Comp. 2
4.7 k
R
5
12 V) supply voltage is approximately 9.2 V/9.4 V and has a
20 k
Logic circuit
R
6
RESET
RESET
CK
GND
),
SL
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