FUJITSU SEMICONDUCTOR
DATA SHEET
DS04-27402-5E
ASSP
BIPOLAR
POWER-VOLTAGE MONITORING IC
WITH WATCHDOG TIMER
MB3793-42
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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 fail-safe function for various application systems.
There is also a mask option that can detect voltages of 4.9 to 2.4V in 0.1-V steps.
The model number and package code are as shown below.
Model No.
MB3793-42
Marking Code
3793-A
Detection voltage
4.2 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
= 27
µA
(reference)
Internal dual-input watchdog timer
Watchdog timer halt function (by inhibition terminal)
Independently-set watchdog and reset times
Mask option for detection voltage (4.9 to 2.4 V, 0.1-V steps)
Two types of packages (SOP-8pin : 2 types)
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APPLICATION
• Arcade Amusement
etc.
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FUJITSU [ FUJITSU COMPONENT LIMITED. ]
