5V µP Power Supply Monitor and Reset Circuit

– Selectable Trip-Point Tolerance and Watchdog Period

– Push-Button Reset

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 compatible Dallas Semiconductor DS1232LP/LPS.

Key Features

◆ Pin compatible with the Dallas Semiconductor DS1232LP/1232LPS

   — 40% lower supply current

◆ 5V supply monitor

◆ Selectable watchdog period

◆ Debounce manual push-button reset input

◆ Precision temperature-compensated voltage reference and comparator

◆ Power-up, power-down and brownout detection

◆ 250ms reset time

◆ Active LOW open-drain reset and active HIGH push-pull output

◆ Selectable trip point tolerance: 5% or 10%

◆ Low-cost, surface mount packages: 8/16-pin SO, 8-pin DIP and 8-pin MicroSO

◆ Wide operating temperature –40°C to +85°C (N/EPA suffixed devices)