LP3470IM5X-4.38/NOPB National Semiconductor, LP3470IM5X-4.38/NOPB Datasheet

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LP3470IM5X-4.38/NOPB

Manufacturer Part Number
LP3470IM5X-4.38/NOPB
Description
IC CIRCUIT TNY PWR RESET SOT23-5
Manufacturer
National Semiconductor
Type
Simple Reset/Power-On Resetr
Datasheet

Specifications of LP3470IM5X-4.38/NOPB

Number Of Voltages Monitored
1
Output
Open Drain or Open Collector
Reset
Active Low
Reset Timeout
1 ms Minimum
Voltage - Threshold
4.38V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
SOT-23-5, SC-74A, SOT-25
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
LP3470IM5X-4.38/NOPBTR
© 2009 National Semiconductor Corporation
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 adjusta-
bility for power-on-reset (POR) and supervisory functions. It
is available in the following six standard reset threshold volt-
age (V
4.38V, and 4.63V. If other voltage options between 2.4V and
5.0V are desired please contact your National Semiconductor
representative.
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.
Pin Configuration and Basic Operating Circuit
RTH
CC
) options: 2.63V, 2.93V, 3.08V, 3.65V, 4.00V,
has risen above the threshold voltage.
See NS Package Number
Pin Configuration
Top View
MF05A
10001602
100016
CC
supply
LP3470
Key Specifications
Features
Applications
±1% Reset Threshold Accuracy Over Temperature
Standard Reset Threshold Voltages: 2.63V, 2.93V, 3.08V,
3.65V, 4.00V, 4.38V, and 4.63V
Custom Reset Threshold Voltages: For other voltages
between 2.4V and 5.0V contact your National
Semiconductor representative
Very Low Quiescent Current (16 µA typical)
Guaranteed Reset valid down to V
Tiny SOT23-5 Package
Open Drain Reset Output
Programmable Reset Timeout Period Using an External
Capacitor
Immune to Short V
Critical µP and µC Power Monitoring
Intelligent Instruments
Computers
Portable/Battery-Powered Equipments
Basic Operating Circuit
CC
Transients
CC
=0.5V
September 3, 2009
www.national.com
10001601

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LP3470IM5X-4.38/NOPB Summary of contents

Page 1

... RTH 4.38V, and 4.63V. If other voltage options between 2.4V and 5.0V are desired please contact your National Semiconductor representative. 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 ...

Page 2

... LP3470IM5-2.83 2.83 LP3470IM5X-2.83 LP3470IM5-2.93 2.93 LP3470IM5X-2.93 LP3470IM5-3.08 3.08 LP3470IM5X-3.08 −40°C to +85°C LP3470IM5-3.65 3.65 LP3470IM5X-3.65 LP3470IM5-4.00 4.00 LP3470IM5X-4.00 LP3470IM5-4.38 4.38 LP3470IM5X-4.38 LP3470IM5-4.63 4.63 LP3470IM5X-4.63 4.80 LP3470IM5X-4.8 www.national.com Order Package Number Marking D25B D25B D26B D26B D28B D28B D29B D29B D30B ...

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 Statistical 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 ...

Page 4

Typical Operating Characteristics I vs Temperature Reset Delay vs Temp CC Normalized V RTH www.national.com T = +25°C, unless otherwise specified. A 10001610 10001613 vs Temp. 10001608 10001611 Normalized t vs ...

Page 5

HYST RTH Pin Descriptions Pin Name 1 SRT Set Reset Time-out Input. Connect a capacitor between this input and ground to select the Reset Time- out period (t floating. 2 GND Ground pin Always connect ...

Page 6

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 sufficient. The Reset ...

Page 7

Typical Application Circuit 7 10001605 www.national.com ...

Page 8

Physical Dimensions For Ordering Information See Ordering Information Table In This Data Sheet www.national.com inches (millimeters) unless otherwise noted 5-Lead Small Outline Package (M5) NSPackage Number MF05A 8 ...

Page 9

Notes 9 www.national.com ...

Page 10

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www ...

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