The LTC2917-A/LTC2917-B and LTC2918-A/LTC2918-B are low voltage single-supply monitors with selectable thresholds and an adjustable watchdog timer. The parts operate from 1.5V to 5.5V and consume a quiescent current of only 30A. Two three state inputs select one of nine internally programmed thresholds without the need for external resistors. For the LTC2917, an additional three state input determines the tolerance (5%, 10%, 15%). The tolerance for the LTC2918 is fixed at 5%. Threshold accuracy is guaranteed at 1.5% over the entire operating temperature range. Glitch filtering ensures reliable reset operation without false triggering.