LM8365

Micropower Undervoltage Sensing Circuits with

Programmable Output Delay

General Description

The LM8365 series are micropower undervoltage sensing

circuits that are ideal for use in battery powered micropro-

cessor based systems, where extended battery life is a key

requirement.

A range of threshold voltages from 2.0V to 4.5V are available

with an active low, open drain or CMOS, output. These

devices feature a very low quiescent current of 0.65µA typi-

cal. The LM8365 series features a highly accurate voltage

reference, a comparator with precise thresholds and built-in

hysterisis to prevent erratic reset operation, a time delayed

output which can be programmed by the system designer,

and guaranteed Reset operation down to 1.0V with ex-

tremely low standby current.

These devices are available in the space saving 5-Pin

SOT23 surface mount package. For additional undervoltage

thresholds and output options, please contact National

Semiconductor.

Features

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Extremely Low Quiescent Current: 0.65µA, at V

2.87V

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Complementary or Open Drain Output

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Programmable output delay by external Capacitor

(100ms typ with 0.1µF)

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Input Voltage Range: 1V to 6V

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Surface Mount Package (5-Pin SOT23)

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Pin for pin compatible with MC33465

Applications

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Low Battery Detection

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Microprocessor Reset Controller

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Power Fail Indicator

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Battery Backup Detection

Functional Diagrams

CMOS Output

Open Drain Output

20066013

20066014

Connection Diagram

5-Pin SOT23

20066012

Top View

March 2003

© 2003 National Semiconductor Corporation

DS200660

www.national.com