|
ASM811REUSF-T Datasheet, PDF (1/11 Pages) ON Semiconductor – 4-Pin muP Voltage Supervisor with Manual Reset | |||
|
April 2005
ASM811, ASM812
rev 1.5
4-Pin µP Voltage Supervisor with Manual Reset
General Description
The ASM811/ASM812 are cost effective low power supervisors
designed to monitor voltage levels of 3.0V, 3.3V and 5.0V
power supplies in low-power microprocessor (µP),
microcontroller (µC) and digital systems. They provide excellent
reliability by eliminating external components and adjustments.
A reset signal is issued if the power supply voltage drops below
a preset reset threshold and is asserted for at least 140ms after
the supply has risen above the reset threshold. The ASM811
has an active-low output RESET that is guaranteed to be in the
correct state for VCC down to 1.1V. The ASM812 has an active-
high RESET output. The reset comparator is designed to ignore
fast transients on VCC. A debounced manual reset input allows
the user to manually reset the systems to bring them out of
locked state.
Low power consumption makes the ASM811/ASM812 ideal for
use in portable and battery operated equipment. The ASM811/
ASM812 are available in a compact 4-pin SOT-143 package
and thus use minimal board space.
Six voltage thresholds are available to support 3V to 5V
systems:
RESET THRESHOLD
Suffix
Voltage (V)
L
4.63
M
4.38
J
4.00
T
3.08
S
2.93
R
2.63
Features
⢠New 4.0V threshold option
⢠6µA supply current
⢠Monitor 5V, 3.3V and 3V supplies
⢠Manual reset input
⢠140ms min. reset pulse width
⢠Guaranteed over temperature
⢠Active-low reset valid with 1.1V supply (ASM811)
⢠Small 4-pin SOT-143 package
⢠No external components
⢠Power-supply transient-immune design
Applications
⢠Computers and Controllers
⢠Embedded controllers
⢠Portable/Battery operated systems
⢠Intelligent instruments
⢠Wireless communication systems
⢠PDAs and handheld equipments
⢠Automotive systems
⢠Safety Systems
Typical Operating Circuit
VCC
VCC
ASM811
(ASM812)
MR RESET
(RESET)
GND
VCC
µP
RESET (RESET)
Input
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
|
▷ |