ASM1233D Datasheet, PDF (1/11 Pages) Alliance Semiconductor Corporation – Low Power, 5V/3.3V, uP Reset, Active LOW, Open-Drain Output

March 2005
ASM1233D-L/D/M
rev 1.3
Low Power, 5V/3.3V, µP Reset, Active LOW, Open-Drain Output
General Description
Applications
The ASM1233D-L/1233D/1233M are voltage supervisors with
low-power, 5/3.3V µP Reset, with an active LOW, open-drain
output. Maximum supply current over temperature is 15µA for
3.3V devices and 20µA for 5V devices.
The ASM1233D-L/1233D/1233M generates an active LOW
reset signal whenever the monitored supply is out of tolerance.
A precision reference and comparator circuit monitors power
supply (V_CC) level. The tolerance are 5%,10% and 15%. 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.
• Set-top boxes
• Cellular phones
• PDAs
• Energy management systems
• Embedded control systems
• Printers
• Single board computers
Typical Operating Circuit
V_CC
The ASM1233D-L/1233D/1233M is designed with an open-
drain output stage and operates over the extended industrial
temperature range. These devices are available in compact
SOT-223, SO-8 and TO-92 packages.
Other low power products in this family include ASM1810/11/
12/15/16/17.
RESET
GND
Microprocessor
RESET
Key Features
• Low Supply Current
• 15µA maximum (<=3.6V), 20µA maximum (5.5V)
• 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 SOT-223/SO-8/TO-92 packages
• Operating temperature: -40°C to +85°C
Block Diagram
V_CC
ASM1233D-L,ASM1233D,ASM1233M
Supply
Tolerance
Bias
+
-
Reference
5.0kΩ
Delay
350ms
Typical
RESET
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