October 2003
rev 1.0
ASM1817
Low Power, 3.3V/3.0V P Reset, Active HIGH, Push-Pull Output
Applications
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Set-top boxes
Cellular phones
PDAs
Energy management systems
Embedded control systems
Printers
Single board computers
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.
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 (V
CC
)
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 V
CC
returns to an in-tolerance condition, the reset signal
remains active for 150ms to allow the power supply and system
microprocessor to stabilize.
Typical Operating Circuit
V
CC
ASM1817
The ASM1817 is designed with a push-pull output stage and
operates over the extended industrial temperature range.
Devices are available in compact surface mount SOT-23
packages and 3-lead TO-92 packages.
Other low power products in this family include the ASM1810/
11/12/15/16, ASM1233D and ASM1233M.
RESET
RESET
Microprocessor
GND
Key Features
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Low Supply Current
•20 µA maximum (5.5 V)
•15 µA maximum (3.6 V)
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Automatically restarts a microprocessor after power failure
150ms reset delay after V
CC
returns to an in-tolerance con-
dition
Active HIGH power-up reset
Precision temperature-compensated voltage reference and
comparator
Eliminates external components
Low-cost TO-92 package
Compact surface mount SOT-23 package
Push-Pull output for minimum current drain
Operating temperature -40°C to +85°C
Block Diagram
V
CC
2
Supply
Tolerance
Bias
ASM1817
+
Delay
150ms
Typical
1
-
Reference
RESET
3
GND
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
PULSECORE [ PulseCore Semiconductor ]
