DS04-27403-2E

FUJITSU SEMICONDUCTOR

DATA SHEET

ASSP For Power Supply Applications

BIPOLAR

Power Voltage Monitoring IC

with Watchdog Timer

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 applicaiton 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.

s FEATURES

• Precise detection of power voltage fall:

±2.5%

• Detection voltage with hysteresis

µA (reference)

• Internal dual-input watchdog timer

• Watchdog-timer halt function (by inhibition pin)

• Independently-set wacthdog and reset times

s PACKAGE

Model No.

Package code

Detection voltage

MB3793-37A

3793AF

3.7 V

8-pin, Plastic SOP

(FPT-8P-M01)

8-pin, Plastic SOL

(FPT-8P-M02)