IIMP1832

The IMP1832 microprocessor supervisor 622848 0322294796915 can halt and restart a "hungup" or "stalled" microprocessor, restart a microprocessor after a power failure, and debounce a manual push-button microprocessor reset switch. The IMP1832 features over 40% lower supply current than the pin compatible Dallas Semiconductor DS1832.

Precision temperature compensated reference and comparator circuits monitor the 3.3V, VCC input voltage. During power-up or when the VCC power supply falls outside selectable tolerance limits, both PBRST and PBRST become active. When VCC 622848 0322294796915 rises above the threshold voltage, the reset signals remain active for an additional 250ms minimum, allowing the power supply and system microprocessor to stabilize. The trip point tolerance signal, TOL, selects the trip level tolerance to be either 10- or 20-percent.

PERST and PERST outputs are push-pull. A debounced manual reset input, PBRST, activates the reset outputs for a minimum period of 250ms.

Also 622848 0322294796915 is included is a watchdog timer to stop and restart a microprocessor that is "hung-up". Three watchdog timeout periods are selectable: 150ms, 610ms and 1,200ms. If the ST input is not strobed LOW before the time-out period expires, a reset is issued.

Devices are available in 8-pin DIP, 8-pin SO and compact 8-pin MicroSO packages.