LP3470IM5-4.00 National Semiconductor, LP3470IM5-4.00 Datasheet

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LP3470IM5-4.00

Manufacturer Part Number
LP3470IM5-4.00
Description
Tiny Power On Reset Circuit
Manufacturer
National Semiconductor
Datasheet

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© 1999 National Semiconductor Corporation
LP3470
Tiny Power On Reset Circuit
General Description
The LP3470 is a micropower CMOS voltage supervisory cir-
cuit designed to monitor power supplies in microprocessor
(µP) and other digital systems. It provides maximum adjust-
ability for power-on-reset (POR) and supervisory functions. It
is available in the following six standard reset threshold volt-
age (V
4.63V. If other voltage options between 2.4V and 5.0V are
desired please contact your National Semiconductor repre-
sentative.
The LP3470 asserts a reset signal whenever the V
voltage falls below a reset threshold. The reset time-out pe-
riod is adjustable using an external capacitor. Reset remains
asserted for an interval (programmed by an external capaci-
tor) after V
The device is available in the tiny SOT23-5 package.
Key Specifications
n
n Standard Reset Threshold Voltages: 2.63V, 2.93V,
Pin Configuration and Basic Operating Circuit
3.08V, 4.00V, 4.38V, and 4.63V
±
1% Reset Threshold Accuracy Over Temperature
RTH
) options: 2.63V, 2.93V, 3.08V, 4.00V, 4.38V, and
CC
has risen above the threshold voltage.
See NS Package Number
Pin Configuration
Top View
MA05B
DS100016-2
DS100016
CC
supply
n Custom Reset Threshold Voltages: For other voltages
n Very Low Quiescent Current (16 µA typical)
n Guaranteed Reset valid down to V
Features
n Tiny SOT23-5 Package
n Open Drain Reset Output
n Programmable Reset Timeout Period Using an External
n Immune to Short V
Applications
n Critical µP and µC Power Monitoring
n Intelligent Instruments
n Computers
n Portable/Battery-Powered Equipments
between 2.4V and 5.0V contact your National
Semiconductor representative
Capacitor
Basic Operating Circuit
CC
Transients
CC
=0.5V
www.national.com
DS100016-1
June 1999

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LP3470IM5-4.00 Summary of contents

Page 1

... RTH 4.63V. If other voltage options between 2.4V and 5.0V are desired please contact your National Semiconductor repre- sentative. The LP3470 asserts a reset signal whenever the V voltage falls below a reset threshold. The reset time-out pe- riod is adjustable using an external capacitor. Reset remains ...

Page 2

... LP3470M5-2.93 LP3470M5X-2.93 LP3470M5-3.08 LP3470M5X-3.08 −20˚C to +85˚C LP3470M5-4.00 LP3470M5X-4.00 LP3470M5-4.38 LP3470M5X-4.38 LP3470M5-4.63 LP3470M5X-4.63 LP3470IM5-2.63 LP3470IM5X-2.63 LP3470IM5-2.93 LP3470IM5X-2.93 LP3470IM5-3.08 LP3470IM5X-3.08 −40˚C to +85˚C LP3470IM5-4.00 LP3470IM5X-4.00 LP3470IM5-4.38 LP3470IM5X-4.38 LP3470IM5-4.63 LP3470IM5X-4.63 www.national.com Package Package (V) RTH Marking Type 2.63 D25B SOT23-5 2.63 D25B SOT23-5 2.93 D26B SOT23-5 2 ...

Page 3

... Note 5: Min. and Max. limits in standard typeface are 100% production tested at 25˚C. Min. and Max. limits in boldface are guaranteed through correlation using Sta- tistical Quality Control (SQC) methods. The limits are used to calculate National’s Average Outgoing Quality Level (AOQL). Note 6: Factory-trimmed reset thresholds are available increments from 2.4V to 5.0V. Contact your National Semiconductor representative. Note 7: V affects the relation between V and Reset as shown in the timing diagram ...

Page 4

Typical Operating Characteristics I vs Temperture CC DS100016-10 Normalized t vs Temp. RP DS100016- HYST RTH DS100016-14 Pin Description Pin Name 1 SRT Set Reset Time-out Input. Connect a capacitor between this input and ground to select ...

Page 5

Functional Block Diagram Application Information Reset Timeout Period The Reset Timeout Period ( programmable using an RP external capacitor (C ) connected to pin SRT of LP3470 Ceramic chip capacitor rated at or above 10V is ...

Page 6

Timing Diagram Typical Application Circuit www.national.com DS100016-4 DS100016-5 6 ...

Page 7

... 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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