November 2006
rev 1.4
ASM1233D-L/D/M
Low Power, 5V/3.3V, µP Reset, Active LOW, Open-Drain 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 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.
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.
Typical Operating Circuit
V
CC
ASM1233D-L/D/M
Microprocessor
RESET
RESET
GND
Block Diagram
Key Features
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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
Reference
Supply
Tolerance
Bias
ASM1233D-L,ASM1233D,ASM1233M
V
CC
5.0kΩ
+
RESET
Delay
350ms
Typical
-
GND
PulseCore Semiconductor Corporation
1715 S. Bascom Ave Sutie 200, Campbell, CA95008 . Tel: 408-879-9077 . Fax: 408-.879-9018 . www.pulsecoresemi.com
Notice: The information in this document is subject to change without notice
PULSECORE [ PulseCore Semiconductor ]
