鈥?/div>
Microprocessor Systems
Computers
Controllers
Portable Equipment
Intelligent Instuments
Automotive Systems
comparator circuits monitor the 5V, V
CC
input voltage status.
During power-up or when the V
CC
power supply falls outside
selectable tolerance limits, both RESET and RESET become
active. When V
CC
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 鈥渉ung-up鈥? 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 8-
pin MicroSO packages.
Typical Operating Circuit
+5V
ASM1232LP/LPS
ST
RESET
GND
TD
TOL
10k鈩?/div>
I/O
碌P
RESET
Block Diagram
ASM1232LP/LPS
V
CC
TOL
Tolerance Selection
+
Reference
V
CC
40k鈩?/div>
Key Features
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
5V 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
250ms minimum reset time
Active LOW open drain reset output and active HIGH
push-pull output
Selectable trip point tolerance: 5% or 10%
RESET
-
RESET
PBRST
TD
Push Button
Debounce
Voltage Sense
Comparators
Watchdog Transition
Detector
Reset &
Watchdog Timer
ST
GND
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
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