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MB3773
16
EXAMPLE 5: Monitoring Two Supply Voltages (with hysteresis and reset output)
VCC1 (5 V)
1
2
3
4
8
7
6
5
MB3773
RESET
RESET
CK
GND
Comp. 2
Example : Comp. 1, Comp. 2
: MB4204, MB47393
20 kΩ
R
6
+
_
+
_
VCC2 (12 V)
180 kΩ
R
4
30 kΩ
R3
5.1 kΩ
R
2
1.2 kΩ
R
1
4.7 kΩ
R
5
Comp. 1
Notes : • When either 5 V or 12 V supply voltage decreases below its detection voltage (V
SL),
the MB3773 RESET terminal is set to High and the MB3773 RESET
terminal is set to Low.
• Use V
CC1 ( = 5 V) to power the comparators (Comp. 1 and Comp. 2) in the external circuit shown
above.
• The detection voltage of the V
CC2 ( = 12 V) supply voltage is approximately 9.2 V/9.4 V and has a
hysteresis width of approximately 0.2 V. For the formulas for finding hysteresis width and detection
voltage, see section 4.
Logic circuit
Diode
CT