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IMP1232LPS Datasheet(PDF) 1 Page - IMP, Inc |
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IMP1232LPS Datasheet(HTML) 1 Page - IMP, Inc |
1 / 7 page © 1999 IMP, Inc. 408-432-9100/www.impweb.com 1 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) Block Diagram RESET PBRST 1 (2) 1232_03.eps 40k Ω TOL IMP1232LP/LPS (16-Pin Package) 3 (6) VCC – + 5%/10% Tolerance Selection Reference VCC 8 (15) RESET 5 (9) TD Push Button Debounce 2 (4) Watchdog Timebase Selection GND 4 (8) Reset & Watchdog Timer 6 (11) ST 7 (13) Watchdog Transition Detector IMP1 IMP1232LP/LPS 232LP/LPS POWER MANAGEMENT 5V 5V µ µP P P Po ow wer Suppl er Supply Monit y Monitor and or and R Reset Cir eset Circuit cuit – Select – Selectable T able Trriip p-P -Point T oint Toler olerance ance and W and Watc atchdog P hdog Per eriod iod – Push-Butt – Push-Button R on Reset eset 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 micro- processor 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 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. A debounced manual reset input activates the reset outputs for a mini- mum period of 250ms. Also included is a watchdog timer to stop and restart a microprocessor that is “hung-up”. Three watchdog time-out 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, 8/16-pin SO and com- pact 8-pin MicroSO packages. |
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