■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 V 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= 31 µA (reference)

• Internal dual-input watchdog timer

• Watchdog-timer halt function (by inhibition pin)

• Independently-set watchdog and reset times

• Three types of packages (SOP-8pin : 2 types, SSOP-8pin : 1 type)