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ASM1832 Datasheet(PDF) 1 Page - Alliance Semiconductor Corporation

Part No. ASM1832
Description  3.3V UP Power Supply Monitor and Reset Circuit
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Manufacturer  ALSC [Alliance Semiconductor Corporation]
Direct Link  http://www.alsc.com
Logo ALSC - Alliance Semiconductor Corporation

ASM1832 Datasheet(HTML) 1 Page - Alliance Semiconductor Corporation

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ASM1832
Alliance Semiconductor
2575 Augustine Drive . Santa Clara, CA 95054 . Tel: 408.855.4900 . Fax: 408.855.4999 . www.alsc.com
Notice: The information in this document is subject to change without notice
rev 1.5
3.3V µP Power Supply Monitor and Reset Circuit
February 2005
General 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 circuits monitor the 3.3V, 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 10% or 20%.
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 PDIP, 8-pin SO and compact 8-
pin MicroSO packages.
Key Features
3.3V supply monitor
Push-pull output
Selectable watchdog period
Debounce manual push-button reset input
Precision temperature-compensated voltage reference
and comparator.
Power-up, power-down and brown out detection
250ms minimum reset time
Active LOW and HIGH reset signal
Selectable trip point tolerance: 10% or 20%
Low-cost 8-pin DIP/SO and 8-pin Micro SO packages
Wide operating temperature -40°C to +85°C
Applications
Microprocessor systems
Computers
Controllers
Portable instruments
Automotive systems
Typical Operating Circuit
Block Diagram
Tolerance Selection
Reference
Push Button
Debounce
Voltage Sense
Comparator
Reset &
Watchdog Timer
Watchdog
Transition Detector
+
-
VCC
TOL
PBRST
TD
ST
RESET
RESET
40K
VCC
VCC
VCC
GND
ASM1832
ST
RESET
RESET
I/O
µP
ASM1832
GND
TOL
TD
3.3V


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