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ASM1817 Datasheet(PDF) 1 Page - Alliance Semiconductor Corporation

Part No. ASM1817
Description  Low Power, 3.3V/3.0V 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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ASM1817 Datasheet(HTML) 1 Page - Alliance Semiconductor Corporation

   
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ASM1817
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 1.5
Low Power, 3.3V/3.0V µP Reset, Active HIGH, Push-Pull Output
February 2005
General Description
The ASM1817 voltage supervisory device with low-power, 3.3V/
3.0V µP Reset, active HIGH, Push-Pull output. Maximum
supply current over temperature is a low 15µA (at 3.6V).
The ASM1817 generates 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 20% percent. 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 ASM1817 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/
11/12/15/16, ASM1233D and ASM1233M.
Key Features
Low Supply Current
•20 µA maximum (5.5 V)
•15 µA maximum (3.6 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
ASM1817
ASM1817
VCC
Supply
Reference
Delay
150ms
Typical
Tolerance
Bias
+
-
VCC
Supply
Tolerance
Bias
-
GND
RESET
Reference
+


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