The ADM6326/ADM6328/ADM6346/ADM6348 devices provide low cost solutions for protecting sensitive circuitry， such as microprocessor and telecommunications circuitry. With built-in glitch immunity， ultralow supply currents， and 24 reset threshold voltage options， the ADM6326/ADM6328/ ADM6346/ADM6348 not only ensure that systems are immune to fast transients on VCC， but also that the devices are suitable for monitoring a variety of supply voltages in low power， portable equipment. These devices provide a reset output during power-up， powerdown， and brownout conditions. On power-up， an internal timer holds RESET asserted for at least 100 ms. This holds the microprocessor in a reset state until conditions have stabilized. The reset output remains operational with VCC as low as 1 V. The ADM6326 and ADM6346 have an active low push-pull reset output. The ADM6328 and ADM6348 have an active low opendrain reset output， which requires an external pull-up resistor. The ADM6326 and ADM6328 offer a choice of ten reset thresholds in increments between 2.2 V and 3.08 V， whereas the ADM6346 and ADM6348 offer a choice of 14 reset thresholds between 3.3 V and 4.63 V. These devices are available in a 3-lead SOT-23 package and operate over the extended temperature range of ?40°C to +85°C.