mb3773ps Fujitsu Microelectronics, Inc., mb3773ps Datasheet - Page 16

• Manufacturer Part Number: mb3773ps
• Description: Power Supply Monitor With Watch-dog Timer
• Manufacturer: Fujitsu Microelectronics, Inc.

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