G699

The G698/G699 are microprocessor (P) supervisory circuits used to monitor the power supplies in P and digital systems. They provide excellent circuit reliability and low cost and adjustments when used with +5V,+3.3V, +3.0V - powered circuits.

These circuits perform a single function: they assert a reset signal whenever the VCC supply voltage declines below a preset threshold, with hysteresis keeping it asserted for time delay determined by externally programmable time delay generator after VCC has risen above the reset threshold. Reset thresholds suitable for operation with a variety of supply voltages are available.

The G699L has an open-drain output stage, while the G698 have push-pull outputs. The G699L's open-drain RESET output requires a pull-up resistor that can be connected to a voltage higher than VCC. The G698L have an active-low RESET output, while the G698H has an active-high RESET output. The reset comparator is designed to ignore fast transients on VCC, and the outputs are guaranteed to be in the correct logic state for VCC down to 0.8V.

Low supply current makes the G698/G699 ideal for use in portable equipment. The G698/G699 are available in 5-pin SOT23-5 packages.