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ASM1233M Datasheet(PDF) 1 Page - Alliance Semiconductor Corporation

Part No. ASM1233M
Description  Low Power, 5V/3.0V, uP Reset, Active LOW, Open-Drain Output
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Maker  ALSC [Alliance Semiconductor Corporation]
Homepage  http://www.alsc.com
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ASM1233M Datasheet(HTML) 1 Page - Alliance Semiconductor Corporation

   
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ASM1233M
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 1.0
Low Power, 5V/3.0V, µP Reset, Active LOW, Open-Drain Output
October 2003
General Description
The ASM1233M is a voltage supervisor with low-power, 5V µP
Reset, with an active LOW, open-drain output. Maximum supply
current over temperature is a low 20µA.
The ASM1233M generates an active LOW reset signal
whenever the monitored supply is out of tolerance. A precision
reference and comparator circuit monitor power supply (VCC)
level. Tolerance level options are 5% ,and 10% for a 5V power
supply. The tolerance is 15% for the 3.3V, ASM1233M. When
an out-of-tolerance condition is detected, an internal power-fail
signal is generated which forces an active LOW reset signal.
After VCC returns to an in-tolerance condition, the reset signal
remains active for 350ms to allow the power supply and system
microprocessor to stabilize.
The ASM1233M is designed with a open-drain output stage and
operates over the extended industrial temperature range.
Devices are available in compact surface mount SO-8
packages and 3-lead TO-92 packages.
Other low power products in this family include the ASM1810/
11/12/15/16/17 and ASM1233D.
Key Features
Low Supply Current
•20 µA maximum (5.5 V)
•15µA maximum (3.6 V)
Automatically restarts a microprocessor after power failure
350ms reset delay after VCC returns to an in-tolerance con-
dition
Active LOW power-up reset, 5k
Ω internal pull-up
Precision temperature-compensated voltage reference and
comparator
Eliminates external components
Low-cost TO-92 package
Compact surface mount SO-8 package
Operating temperature -40°C to +85°C
Applications
Set-top boxes
Cellular phones
•PDAs
Energy management systems
Embedded control systems
Printers
Single board computers
Typical Operating Circuit
Block Diagram
GND
Supply
Reference
Delay
150ms
Typical
Tolerance
Bias
+
-
Microprocessor
ASM1233M
VCC
RESET
Delay
150ms
Typical
+
-
1
2
4
VCC
RESET
RESET
GND
ASM1233M
5.0kΩ


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