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ASM1232LPS

Alliance Semiconductor
Part Number ASM1232LPS
Manufacturer Alliance Semiconductor
Description 5V uP Power Supply Monitor and Reset Circuit
Published Aug 13, 2007
Detailed Description www.DataSheet4U.com January 2005 rev 1.5 ASM1232LP/LPS 5V µP Power Supply Monitor and Reset Circuit • • Low-cost surfac...
Datasheet PDF File ASM1232LPS PDF File

ASM1232LPS
ASM1232LPS

Overview
www.
DataSheet4U.
com January 2005 rev 1.
5 ASM1232LP/LPS 5V µP Power Supply Monitor and Reset Circuit • • Low-cost surface mount packages: 8-pin/16-pin SO, 8-pin DIP and 8-pin Micro SO packages Wide operating temperature -40°C to +85°C (N suffixed devices) General Description The ASM1232LP/LPS 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.
A precision temperature-compensated reference and Applications • • • • • • Microprocessor Systems Computers Controllers Portable Equipment Intelligent Instuments Automotive Systems comparator circuits monitor the 5V, VCC input voltage status.
During power-up or when the VCC power supply falls outside selectable tolerance limits, both 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%.
Each device has both a push-pull, active HIGH reset output and an open drain active LOW reset output.
A debounced manual reset input, PBRST, activates the reset outputs for a minimum period of 250ms.
There is a watchdog timer to stop and restart a microprocessor that is “hung-up”.
The watchdog timeouts periods are selectable: 150ms, 610ms and 1200ms.
If the ST input is not strobed LOW before the time-out period expires, a reset is generated.
Devices are available in 8-pin DIP, 16-pin SO and compact 8pin MicroSO packages.
Typical Operating Circuit +5V ASM1232LP/LPS ST RESET GND TD TOL 10kΩ I/O µP RESET Block Diagram ASM1232LP/LPS VCC TOL Tolerance Selection + Reference VCC 40kΩ Key Features • • • • • • • • 5V supply monitor Selectable watchdog period Debounce manual push-button reset input Precision temperature-compensated voltage reference and ...


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