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ASM1233D Datasheet(PDF) 1 Page - Alliance Semiconductor Corporation

Part No. ASM1233D
Description  Low Power, 5V/3.3V, 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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ASM1233D Datasheet(HTML) 1 Page - Alliance Semiconductor Corporation

 
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ASM1233D-L/D/M
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 1.3
Low Power, 5V/3.3V, µP Reset, Active LOW, Open-Drain Output
March 2005
General Description
The ASM1233D-L/1233D/1233M are voltage supervisors with
low-power, 5/3.3V µP Reset, with an active LOW, open-drain
output. Maximum supply current over temperature is 15µA for
3.3V devices and 20µA for 5V devices.
The ASM1233D-L/1233D/1233M generates an active LOW
reset signal whenever the monitored supply is out of tolerance.
A precision reference and comparator circuit monitors power
supply (VCC) level. The tolerance are 5%,10% and 15%. 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 ASM1233D-L/1233D/1233M is designed with an open-
drain output stage and operates over the extended industrial
temperature range. These devices are available in compact
SOT-223, SO-8 and TO-92 packages.
Other low power products in this family include ASM1810/11/
12/15/16/17.
Key Features
Low Supply Current
• 15µA maximum (<=3.6V), 20µA maximum (5.5V)
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 SOT-223/SO-8/TO-92 packages
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
Microprocessor
VCC
RESET
RESET
GND
GND
Supply
Reference
Delay
350ms
Typical
Tolerance
Bias
+
-
ASM1233D-L,ASM1233D,ASM1233M
VCC
RESET
Delay
Typical
+
-
5.0kΩ


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