The ADM6326/ADM6328/ADM6346/ADM6348 are ultralow power microprocessor supervisory circuits suited to monitoring the power supplies in microprocessor and telecommunications applications. Ultralow supply currents make these parts ideal for use 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 ADM6326 and ADM6346 have an active low push-pull reset output. The ADM6328 and ADM6348 have an active low open drain reset output, which requires an external pull-up resistor. The reset output remains operational with V_CC as low as 1 V. The reset comparator features built-in glitch immunity, making the devices immune to fast transients on V_CC.

There are 24 reset threshold voltage options available, in increments between 2.2 V and 4.63 V, making these devices suitable for monitoring a variety of supply voltages (see the Ordering Guide section). These devices are available in a 3-lead SOT-23 package and operate over the extended temperature range of −40°C to +85°C.