IMP1232 Datasheet | IMP Inc

Features x Pin patible with the Dallas Semiconductor DS1232LP/1232LPS - 40% lower supply current x 5V supply monitor x Selectable watchdog period x Debounce manual push-button reset input x Precision temperature-pensated voltage reference and parator x Power-up, power-down and brownout detection x 250ms reset time x Active LOW open-drain reset and active HIGH push-pull output x Selectable trip point tolerance: 5% or 10% x Low-cost, surface mount packages: 8/16-pin SO, 8-pin DIP and 8-pin Micro SO x Wide operating temperature - 40°C to +85°C (N/EPA suffixed devices) The IMP1232LP/LPS microprocessor supervisor can halt and restart a “hung-up” or “stalled” microprocessor, restart a microprocessor after a power failure, and debounce and interface a manual push-button microprocessor reset switch. The low-power supervisors feature 40% lower supply current than the pin patible Dallas Semiconductor DS1232LP/LPS. Precision temperature pensated reference and parator circuits monitor the 5V, VCC input voltage. During power-up or when the VCC power supply falls outside selectable tolerance limits, both the RESET and RESET bee active. When VCC 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 5- or 10-percent. Each device has both a push-pull, active HIGH reset output and an open drain, active LOW reset output. 150ms, 610ms and 1,200ms. If the ST input is not strobed A debounced manual reset input activates the reset outputs for a mini- LOW before the time-out period expires, a reset is issued. mum period of 250ms. Devices are available in 8-pin DIP, 8/16-pin SO and Also included is a watchdog timer to stop and restart a microprocessor pact 8-pin Micro SO packages. that is “hung-up”. Three watchdog time-out periods are selectable: Block Diagram VCC TOL 8 (15) IMP1232LP/LPS 3 (6)...