© Semiconductor Components Industries, LLC, 2011

August, 2011 − Rev. 3

1

Publication Order Number:

ASM1832/D

ASM1832

3.3 V mP Power Supply

Monitor and Reset Circuit

Description

The ASM1832 is a fully integrated microprocessor supervisor. It

can halt and restart a “hung−up” microprocessor, restart a

microprocessor after a power failure. It has a watchdog timer and

external reset override. RESET and RESET outputs are push−pull.

A precision temperature−compensated reference and comparator

above the threshold voltage, the reset signals remain active for an

additional 250 ms 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%.

A debounced manual reset input, PBRST, activates the reset outputs

for a minimum period of 250 ms. There is a watchdog timer to stop and

restart a microprocessor that is “hung−up”. The watchdog timeouts

periods are selectable: 150 ms, 610 ms, and 1200 ms. If the ST input is

not strobed LOW before the time−out period expires, a reset is

generated.

Devices are available in 8−pin PDIP, 8−pin SO and compact 8−pin

MicroSO packages.

Features

Comparator

Applications

http://onsemi.com

PIN CONFIGURATION

See detailed ordering and shipping information in the package

dimensions section on page 9 of this data sheet.

ORDERING INFORMATION

PDIP−8

NO SUFFIX

CASE 646AA

SOIC−8

S SUFFIX

CASE 751BD

PBRST

TD

TOL

GND

ST

RESET

RESET

ASM1832

1

MICRO−8

U SUFFIX

CASE 846AA