LM810M3-2.93 National Semiconductor, LM810M3-2.93 Datasheet

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LM810M3-2.93

Manufacturer Part Number
LM810M3-2.93
Description
3-Pin Microprocessor Reset Circuits
Manufacturer
National Semiconductor
Datasheet

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© 1999 National Semiconductor Corporation
LM809/LM810
3-Pin Microprocessor Reset Circuits
General Description
The LM809/810 microprocessor supervisory circuits can be
used to monitor the power supplies in microprocessor and
digital systems. They provide a reset to the microprocessor
during power-up, power-down and brown-out conditions.
The function of the LM809/810 is to monitor the V
voltage, and assert a reset signal whenever this voltage de-
clines below the factory-programmed reset threshold. The
reset signal remains asserted for 240ms after V
above the threshold. The LM809 has an active-low RESET
output, while the LM810 has an active-high RESET output.
Six standard reset voltage options are available, suitable for
monitoring 5V, 3.3V, and 3V supply voltages.
With a low supply current of only 15µA, the LM809/810 are
ideal for use in portable equipment. The LM809/LM810 are
available in the 3-pin SOT23 package.
Typical Application Circuit
DS101057
DS101057-1
CC
CC
supply
rises
Features
n Precise monitoring of 3V, 3.3V, and 5V supply voltages
n Superior upgrade to MAX809/810
n Fully specified over temperature
n 140ms min. Power-On Reset pulse width, 240ms typical
n Guaranteed RESET Output valid for V
n Low Supply Current, 15µA typ.
n Power supply transient immunity
Applications
n Microprocessor Systems
n Computers
n Controllers
n Intelligent Instruments
n Portable/Battery-Powered Equipment
n Automotive
Connection Diagram
Active-low RESET Output (LM809)
Active-high RESET Output (LM810)
( ) are for LM810
CC
DS101057-2
September 1999
1V
www.national.com

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LM810M3-2.93 Summary of contents

Page 1

... With a low supply current of only 15µA, the LM809/810 are ideal for use in portable equipment. The LM809/LM810 are available in the 3-pin SOT23 package. Typical Application Circuit © 1999 National Semiconductor Corporation DS101057 Features n Precise monitoring of 3V, 3.3V, and 5V supply voltages n Superior upgrade to MAX809/810 n Fully specified over temperature n 140ms min ...

Page 2

... LM810M3-4.63 4.38 LM810M3-4.38 4.00 LM810M3-4.00 3.08 LM810M3-3.08 2.93 LM810M3-2.93 2.63 LM810M3-2.63 Custom voltages and improved accuracies are available, subject to minimum orders. Contact your local National Semiconductor Sales Office for information. Pin Description PIN NAME 1 GND Ground reference Active-low output. RESET remains low while V ...

Page 3

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications RESET, RESET −0. Input Current, V Pin CC Output Current, RESET, RESET Pin Rate of Rise Electrical Characteristics = full range −40˚C to +105˚C, unless otherwise noted. Typical values are at T ...

Page 4

Electrical Characteristics = full range −40˚C to +105˚C, unless otherwise noted. Typical values are 3.3V for 3.08/2.93 versions, and V 4.63/4.38/4.00 versions Symbol Parameter RESET Output Voltage V OH High ...

Page 5

Applications Information Benefits of Precision Reset Thresholds A microprocessor supply supervisor must provide a reset output within a predictable range of the supply voltage. A common threshold range is between 5% and 10% below the nominal supply voltage. The 4.63V ...

Page 6

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

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