FUJITSU SEMICONDUCTOR
DATA SHEET
DS04-27403-4E
ASSP For Power Supply Applications
BIPOLAR
Power Voltage Monitoring IC
with Watchdog Timer
MB3793
-37A
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DESCRIPTION
The MB3793 is an integrated circuit to monitor power voltage; it incorporates a watchdog timer.
A reset signal is output when the power is cut or falls abruptly. When the power recovers normally after resetting,
a power-on reset signal is output to microprocessor units (MPUs). An internal watchdog timer with two inputs for
system operation diagnosis can provide a fall-safe function for various application systems.
There is also a mask option that can detect voltages of 4.9 to 2.4 V in 0.1-V steps.
The model number is MB3793-37A corresponding to the detected voltage. The model number and package code
are as shown below.
Model No.
Marking code
Detection voltage
MB3793-37A
3793AF
3.7 V
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FEATURES
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Precise detection of power voltage fall:
±2.5%
Detection voltage with hysteresis
Low power dispersion: I
CC
= 30
µA
(reference)
Internal dual-input watchdog timer
Watchdog-timer halt function (by inhibition pin)
Independently-set wacthdog and reset times
Two types of packages (SOP-8pin : 2 types)
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APPLICATION
• Arcade Amusement
etc
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FUJITSU [ FUJITSU COMPONENT LIMITED. ]
