ASM811 ETC-unknow, ASM811 Datasheet

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ASM811

Manufacturer Part Number
ASM811
Description
Low Power Cpu Supervisor
Manufacturer
ETC-unknow
Datasheet

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October 2003
rev 1.0
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
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 V
high RESET output. The reset comparator is designed to ignore
fast transients on V
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.
Applications
Computers and Controllers
Embedded controllers
Portable/Battery operated systems
Intelligent instruments
Wireless communication systems
PDAs and handheld equipment
Automotive systems
Safety Systems
supplies
2575 Augustine Drive . Santa Clara, CA 95054 . Tel: 408.855.4900 . Fax: 408.855.4999 . www.alsc.com
CC
CC
in
down to 1.1V. The ASM812 has an active-
. A debounced manual reset input allows
low-power
Notice: The information in this document is subject to change without notice
4 Pin µP Voltage Supervisor with Manual Reset
microprocessor
(µP),
Alliance Semiconductor
Six voltage thresholds are available to support 3V to 5V
systems:
Features
Typical Operating Circuit
New 4.0V threshold option
9µA 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
Suffix
RESET THRESHOLD
V
M
R
T
S
L
J
CC
MR
(RESET)
GND
RESET
V
CC
Voltage
4.63
4.38
4.00
3.08
2.93
2.63
ASM811, ASM812
RESET
Input
GND
V
CC
(RESET)
µP

Related parts for ASM811

ASM811 Summary of contents

Page 1

... 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 the correct state for V down to 1 ...

Page 2

... V CC after MR returns HIGH. The active low input has an internal 20kΩ pull-up MRST Manual Reset (MR) Input A logic low on MR assserts RESET LOW on the ASM811 and a microprocessor / RESET HIGH on the ASM812 internally pulled high through a 20kΩ resistor and can be driven by TTL/CMOS gates or with open collector/drain outputs ...

Page 3

... MR can be driven by TTL/CMOS logic or even an external switch. Valid Reset with V under 1. ensure logic inputs connected to the ASM811 RESET pin are in a known state when V is under 1.1V, a 100kΩ pull- CC down resistor at RESET is needed. The value is not critical. ...

Page 4

... Pin µP Voltage Supervisor with Manual Reset Notice: The information in this document is subject to change without notice Min Max Units -0.3 6 0.3 -0 100 V/µs Min Max 320 -40 105 -65 160 300 ASM811, ASM812 Units uW °C °C ° ...

Page 5

... Notes: 1. Production testing done 25°C. Over-temperature specifications guaranteed by design only using six sigma design limits. 2. RESET output is active LOW for the ASM811 and RESET output is active HIGH for the ASM812. 3. Glitches of 100ns or less typically will not generate a reset pulse. 4 Pin µP Voltage Supervisor with Manual Reset Notice: The information in this document is subject to change without notice = -40° ...

Page 6

... Notes: 1. Production testing done 25°C. Over-temperature specifications guaranteed by design only using six sigma design limits. 2. RESET output is active LOW for the ASM811 and RESET output is active HIGH for the ASM812. 3. Glitches of 100ns or less typically will not generate a reset pulse. 4 Pin µP Voltage Supervisor with Manual Reset ...

Page 7

... Pin µP Voltage Supervisor with Manual Reset Notice: The information in this document is subject to change without notice = -40°C to 105°C. Typical values for R devices 100 125 ASM811R 100 125 ASM811R ASM811T 100 125 ASM811, ASM812 = 25° ...

Page 8

... Pin µP Voltage Supervisor with Manual Reset Notice: The information in this document is subject to change without notice Plastic SOT-143 (4-Pin Max 1.194 0.127 0.559 B1 e 0.965 0.152 D 3.048 1.397 A 2.032 e 2.007 A1 2.489 0.305 ASM811, ASM812 0° -8° ...

Page 9

... October 2003 rev 1.0 Ordering Information: 1 Reset Threshold (V) Part Number ASM811 ACTIVE LOW RESET ASM811LEUS-T ASM811MEUS-T ASM811JEUS-T ASM811TEUS-T ASM811SEUS-T ASM811REUS-T ASM812 ACTIVE HIGH RESET ASM812LEUS-T ASM812MEUS-T ASM812JEUS-T ASM812TEUS-T ASM812SEUS-T ASM812REUS-T Notes: 1. Tape and Reel packaging is indicated by the -T designation. Related Products: Max Supply Current ...

Page 10

... Alliance products in such life-supporting systems implies that the manufacturer assumes all risk of such use and agrees to indemnify Alliance against all claims arising from such use. ASM811, ASM812 Copyright © Alliance Semiconductor All Rights Reserved Part Number: ASM811, ASM812 Document Version: v 1.0 ...

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