MB3773 Fujitsu, MB3773 Datasheet - Page 13

• Manufacturer Part Number: MB3773
• Description: Power Supply Monitor with Watch-Dog Timer
• Manufacturer: Fujitsu

V
V
CC2
CC1
NOTE: When either 5V or 12V supply voltage decreases below its detection voltage (V
Example
(12V)
(5V)
EXAMPLE 5 : Montitoring Two (M) Supply Voltages (with hysterisis and reset output)
• Use V
• The detection voltage of the V
RESET pin is set to High and the MB3773 RESET pin is set to Low.
above.
hysterisis width of approximately 0.2V.
For the formulas for finding hysterisis width and detection voltage, see section 4.
C
T
: Comp. 1, Comp. 2
: MB4204, MB47393
CC
1 (=5V) to power the comparators (Comp. 1 and Comp. 2) in the external circuit shown
1
2
3
4
MB3773
1.2k
5.1k
8
7
6
5
R
R
2
1
CC
2 (=12V) supply voltage is approximately 9.2V/9.4V and has a
4.7k
R
5
Comp. 1
30k
R
+
_
180k
3
R
4
Diode
Comp. 2
+
_
20k
R
6
RESET
RESET
CK
SL
), the MB3773
MB3773
GND
Logic circuit
13