FUJITSU SEMICONDUCTOR
DATA SHEET
DS04-27404-2E
ASSP For Power Supply Applications
BIPOLAR
Power Voltage Monitoring IC
with Watchdog Timer
MB3793-27A
s 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.
s FEATURES
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Precise detection of power voltage fall: ±2.5%
Detection voltage with hysteresis
Low power dispersion: ICC = 31 µA (reference)
Internal dual-input watchdog timer
Watchdog-timer halt function (by inhibition pin)
Independently-set wacthdog and reset times
s PACKAGE
8-pin, Plastic SOP
8-pin, Plastic SOP
(FPT-8P-M01)
(FPT-8P-M02)
8-pin, Plastic SSOP
8-pin, Plastic DIP
(FPT-8P-M03)
(DIT-8P-M01)
