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ASM1232LPS-2F Datasheet(PDF) 1 Page - ON Semiconductor |
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ASM1232LPS-2F Datasheet(HTML) 1 Page - ON Semiconductor |
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1 / 12 page  © Semiconductor Components Industries, LLC, 2011 August, 2011 − Rev. 3 1 Publication Order Number: ASM1232LP/D ASM1232LP, ASM1232LPS 5 V mP Power Supply Monitor and Reset Circuit 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 comparator circuits monitor the 5 V, 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 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 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 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 DIP, 16−pin SO and compact 8−pin MicroSO packages. Features • 5 V Supply Monitor • Selectable Watchdog Period • Debounce Manual Push−button Reset Input • Precision Temperature−compensated Voltage Reference and Comparator • Power−up, Power−down and Brown Out Detection • 250 ms Minimum Reset Time • Active LOW Open Drain Reset Output and Active HIGH Push−pull Output • Selectable Trip Point Tolerance: 5% or 10% • 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) Applications • Microprocessor Systems • Computers • Controllers • Portable Equipment • Intelligent Instruments • Automotive Systems http://onsemi.com PIN CONFIGURATIONS See detailed ordering and shipping information in the package dimensions section on page 12 of this data sheet. ORDERING INFORMATION PDIP−8 P SUFFIX CASE 646AA SOIC−8 S SUFFIX CASE 751BD PBRST TD TOL GND VCC ST RESET RESET 1 DIP/SO/MicroSO (Top View) MICRO−8 U SUFFIX CASE 846AA SO (Top View) 1 SOIC−16 S SUFFIX CASE 751BG NC VCC NC ST NC RESET NC RESET NC PBRST NC TD NC TOL NC GND |
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