The ADM12914 is a quad voltage supervisory IC ideally suited for monitoring multiple rails in a wide range of applications. Each monitored rail has two dedicated input pins， VHx and VLx， which allows each rail to be monitored for both undervoltage （UV） and overvoltage （OV） conditions with high threshold accuracy of ±0.8%. Common active low undervoltage （UV） and overvoltage （OV） pins are shared by each of the monitored voltage rails. The ADM12914 includes a 1 V buffered reference output， REF， that acts as an offset when monitoring a negative voltage. The three-state SEL pin determines the polarity of the third and fourth inputs， that is， it configures the device to monitor positive or negative supplies.

　　The device incorporates an internal shunt regulator that enables the device to be used in higher voltage systems. This feature requires a resistor to be placed between the main supply rail and the VCC pin to limit the current flow into the VCC pin at a level no greater than 10 mA. The ADM12914 uses the internal shunt regulator to regulate VCC if the supply line exceeds the absolute maximum ratings.