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ASM1812 Datasheet(PDF) 1 Page - Alliance Semiconductor Corporation

Part No. ASM1812
Description  Low Power 5V uP Reset Active HIGH, Push-Pull Output
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Maker  ALSC [Alliance Semiconductor Corporation]
Homepage  http://www.alsc.com
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ASM1812 Datasheet(HTML) 1 Page - Alliance Semiconductor Corporation

   
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ASM1812
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 1.4
Low Power 5V µP Reset Active HIGH, Push-Pull Output
February 2005
General Description
The ASM1812 is a voltage supervisory device with low-power,
5V µP Reset, active HIGH, Push-Pull output. Maximum supply
current over temperature is a low 20µA.
The ASM1812 issues an active HIGH 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%, 10% and 15%. When an out-of-
tolerance condition is detected, an internal power-fail signal is
generated which forces an active HIGH reset signal. After VCC
returns to an in-tolerance condition, the reset signal remains
active for 150ms to allow the power supply and system
microprocessor to stabilize.
The ASM1812 is designed with a push-pull output stage and
operates over the extended industrial temperature range.
Devices are available in TO-92 and compact surface mount
SOT-23 packages.
Other low power products in this family include the ASM1810/
11/15/16/17, ASM1233D and ASM1233M.
Key Features
Low Supply Current
•20 µA maximum (5.5 V)
Automatically restarts a microprocessor after power failure
150ms reset delay after VCC returns to an in-tolerance con-
dition
Active HIGH power-up reset
Precision temperature-compensated voltage reference and
comparator
Eliminates external components
TO-92 and compact surface mount SOT-23 package
Push-Pull output for minimum current drain
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
ASM1812
ASM1812
VCC
Supply
Reference
Delay
150ms
Typical
Tolerance
Bias
+
-
2
VCC
Supply
Tolerance
Bias
-
GND
Reference
+
1
3
RESET


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