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ASM8500 Datasheet(PDF) 1 Page - Alliance Semiconductor Corporation

Part No. ASM8500
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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ASM8500 Datasheet(HTML) 1 Page - Alliance Semiconductor Corporation

   
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ASM8500
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 / 3.3V µP Reset Active LOW, Open - Drain Output
November 2003
General Description
The ASM8500 is a voltage supervisory device with a low-power,
5V
/3.3V µP Reset, active LOW, open-drain output. Maximum
supply current over temperature is a low 6µA.
The ASM8500 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. Reset
threshold tolerance level is ±1.5%. 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
1.5ms to allow the power supply and system microprocessor to
stabilize.
The ASM8500 is designed with a open-drain output stage and
operates over the extended industrial temperature range.
Devices are available in compact surface mount SOT-89
packages.
Other low power products in this family include the ASM1810/
11/12/15/16/17, ASM1233D and ASM1233M.
Key Features
Low Supply Current
• 6 µA maximum (5.5 V)
Automatically restarts a microprocessor after power failure
1.5ms reset delay after VCC returns to an in-tolerance con-
dition
Active LOW power-up reset
Precision temperature-compensated voltage reference and
comparator
Eliminates external components
Compact surface mount SOT-89 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
Microprocessor
VCC
RESET
RESET
GND
ASM8500
VCC
Supply
Reference
Delay
1.5ms
Typical
Tolerance
Bias
+
-
ASM8500
VCC
Supply
Delay
Typical
Tolerance
Bias
-
GND
RESET
Reference
+
5ΚΩ


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Part NumberComponents DescriptionHtml ViewManufacturer
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ASM1233DLow Power 5V/3.3V uP Reset Active LOW Open-Drain Output 1 2 3 4 5 MoreAlliance Semiconductor Corporation
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ASM1233MLow Power 5V/3.0V uP Reset Active LOW Open-Drain Output 1 2 3 4 5 MoreAlliance Semiconductor Corporation
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ASM1812Low Power 5V uP Reset Active HIGH Push-Pull Output 1 2 3 4 5 MoreAlliance Semiconductor Corporation
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