View mic2778 datasheet:

MIC2778 Micrel MIC2778 Voltage Monitor with Adjustable Hysteresis Final Information General Description Features The MIC2778 is a voltage monitor—uniquely designed to • Optimized for PDAs, cellular telephones, pagers, detect two separate voltage thresholds—combined with a and other battery-powered devices delay generator and logic. It is designed for monitoring the • Independently adjustable high- and battery supply of portable digital systems, particularly PDAs, low-voltage thresholds pagers, and cellular telephones. • Internal logic prevents battery-voltage-fluctuation chatter • High ±2% voltage threshold accuracy; 1% available High- and low-voltage thresholds can be adjusted indepen- • Built in 140ms (minimum) delay deglitches output dently, allowing for wide hysteresis. Vo