ASM1817 Datasheet, PDF (1/9 Pages) Alliance Semiconductor Corporation – Low Power, 3.3V/3.0V uP Reset, Active HIGH, Push-Pull Output

February 2005
ASM1817
rev 1.5
Low Power, 3.3V/3.0V µP Reset, Active HIGH, Push-Pull Output
General Description
Applications
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 (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.
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.
• Set-top boxes
• Cellular phones
• PDAs
• Energy management systems
• Embedded control systems
• Printers
• Single board computers
Typical Operating Circuit
V_CC
ASM1817
RESET
Microprocessor
RESET
Other low power products in this family include the ASM1810/
11/12/15/16, ASM1233D and ASM1233M.
GND
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 V_CC 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
Block Diagram
V_CC
Supply
Tolerance
Bias
+
-
Reference
ASM1817
Delay
150ms
Typical
GND
RESET
Alliance Semiconductor
2575 Augustine Drive . Santa Clara, CA 95054 . Tel: [phone] . Fax: [phone] . www.alsc.com
Notice: The information in this document is subject to change without notice