IMP1232

IMP1 232LP/LPS POWER MANAGEMENT 5V µP Power Supply Monitor and Reset Circuit – Selectable Trip -Point Tolerance and Watchdog Period – Push-Button Reset Key Features x Pin compatible 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-compensated voltage reference and comparator 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 MicroSO 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 compatible Dallas Semiconductor DS1232LP/LPS. Precision temperature compensated reference and comparator 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 become 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 tr...