■ 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.

■ FEATURES

• Precise detection of power voltage fall: ±2.5

• Detection voltage with hysteresis

• Low power dispersion: ICC = 30 µA (reference)

• Internal dual-input watchdog timer

• Watchdog-timer halt function (by inhibition pin)

• Independently-set wacthdog and reset times