ASM1233M Datasheet, PDF (1/9 Pages) Alliance Semiconductor Corporation – Low Power, 5V/3.0V, uP Reset, Active LOW, Open-Drain Output

October 2003
ASM1233M
rev 1.0
Low Power, 5V/3.0V, µP Reset, Active LOW, Open-Drain Output
General Description
Applications
The ASM1233M is a voltage supervisor with low-power, 5V µP
Reset, with an active LOW, open-drain output. Maximum supply
current over temperature is a low 20µA.
The ASM1233M generates an active LOW 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% ,and 10% for a 5V power
supply. The tolerance is 15% for the 3.3V, ASM1233M. When
an out-of-tolerance condition is detected, an internal power-fail
signal is generated which forces an active LOW reset signal.
After V_CC returns to an in-tolerance condition, the reset signal
remains active for 350ms to allow the power supply and system
microprocessor to stabilize.
The ASM1233M is designed with a open-drain output stage and
operates over the extended industrial temperature range.
Devices are available in compact surface mount SO-8
packages and 3-lead TO-92 packages.
• Set-top boxes
• Cellular phones
• PDAs
• Energy management systems
• Embedded control systems
• Printers
• Single board computers
Typical Operating Circuit
V_CC
ASM1233M
RESET
Microprocessor
RESET
Other low power products in this family include the ASM1810/
11/12/15/16/17 and ASM1233D.
GND
Key Features
• Low Supply Current
•20 µA maximum (5.5 V)
•15µA maximum (3.6 V)
• Automatically restarts a microprocessor after power failure
• 350ms reset delay after V_CC returns to an in-tolerance con-
dition
• Active LOW power-up reset, 5kΩ internal pull-up
• Precision temperature-compensated voltage reference and
comparator
• Eliminates external components
• Low-cost TO-92 package
• Compact surface mount SO-8 package
• Operating temperature -40°C to +85°C
Block Diagram
V_CC
2
Supply
Tolerance
Bias
+
-
Reference
ASM1233M
5.0kΩ
Delay
150ms
Typical
1
RESET
4
GND
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