National Semiconductor | High-performance Analog

 

 LP3470   
Tiny Power On Reset Circuit 		Click link to Download

Features

  • Tiny SOT23-5 Package
  • Open Drain ^Reset Output
  • Programmable Reset Timeout Period Using an External Capacitor
  • Immune to Short VCC Transients

    • Description

    The LP3470 is a micropower CMOS voltage supervisory circuit designed to monitor power supplies in microprocessor (µP) and other digital systems. It provides maximum adjustability for power-on-reset (POR) and supervisory functions. It is available in the following six standard reset threshold voltage (VRTH) options: 2.63V, 2.93V, 3.08V, 3.65V, 4.00V, 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 VCC supply voltage falls below a reset threshold. The reset time-out period is adjustable using an external capacitor. Reset remains asserted for an interval (programmed by an external capacitor) after VCC has risen above the threshold voltage.

    The device is available in the tiny SOT23-5 package.

    Key Specification

  • ±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 VCC=0.5V


    • Applications

  • Critical µP and µC Power Monitoring
  • Intelligent Instruments
  • Computers
  • Portable/Battery-Powered Equipments




    • Typical Application
    click for larger image


    		Block Diagram
    click for larger image



    Typical Performance
    click for larger image


     

    ParametersValues
    Power on Reset Yes
    Watchdog No
    Power Fail Input No
    Manual Reset No
    Reset Timeout Period 1 ms
    On/Off Pin No
    PowerGood / Error Flag Yes
    Input Min Voltage 0.5 Volt
    Input Max Voltage 5 Volt
    RegType Supervisor
    Temperature Min -20 deg C
    Temperature Max 85 deg C

    Datasheets
    TitleSizeDateOther
    Language
    LP3470 Tiny Power On Reset Circuit283
    Kbytes    		3-Sep-09日本語  


    Application Notes
    TitleSizeDateOther
    Language
    AN-1144: Application Note 1144 Maximum Load Current Start-Up Issues with the LM3352 Regulated Buck/Boost Switched Capacitor Converter62
    Kbytes    		4-Oct-04 

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LP3470IM5-2.63/NOPB

    LP3470IM5-2.63

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide989
    AVNET-EMWorldwide2000
    DIGI-KEYWorldwide4859
    MOUSERWorldwide1000
    NEWARKAmericas900
    TAYLORAmericas989
    		$0.59 each at 1K+ pcsreel
    of
    1000
    LP3470IM5-2.75/NOPB

    LP3470IM5-2.75

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    AVNET-EMWorldwide1000
    DIGI-KEYWorldwide0
    		$0.59 each at 1K+ pcsreel
    of
    1000
    LP3470IM5-2.83/NOPB

    LP3470IM5-2.83

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$0.59 each at 1K+ pcsreel
    of
    1000
    LP3470IM5-2.93/NOPB

    LP3470IM5-2.93

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide1000
    AVNET-EMWorldwide2000
    DIGI-KEYWorldwide21757
    MOUSERWorldwide1000
    NEWARKAmericas988
    TAYLORAmericas4241
    		$0.59 each at 1K+ pcsreel
    of
    1000
    LP3470IM5-3.08/NOPB

    LP3470IM5-3.08

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide2000
    AVNET-EMWorldwide808
    DIGI-KEYWorldwide6258
    NEWARKAmericas342
    TAYLORAmericas5000
    		$0.59 each at 1K+ pcsreel
    of
    1000
    LP3470IM5-3.65/NOPB

    LP3470IM5-3.65

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide1000
    		$0.59 each at 1K+ pcsreel
    of
    1000
    LP3470IM5-4.00/NOPB

    LP3470IM5-4.00

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide2000
    DIGI-KEYWorldwide0
    NEWARKAmericas850
    TAYLORAmericas2000
    		$0.59 each at 1K+ pcsreel
    of
    1000
    LP3470IM5-4.38/NOPB

    LP3470IM5-4.38

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    AVNET-EMWorldwide1599
    DIGI-KEYWorldwide0
    MOUSERWorldwide430
    RS COMPONENTSWorldwide955
    		$0.59 each at 1K+ pcsreel
    of
    1000
    LP3470IM5-4.63/NOPB

    LP3470IM5-4.63

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide4170
    DIGI-KEYWorldwide1442
    MOUSERWorldwide923
    NEWARKAmericas348
    TAYLORAmericas4170
    		$0.59 each at 1K+ pcsreel
    of
    1000
    LP3470IM5-4.8/NOPB

    LP3470IM5-4.8

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$0.59 each at 1K+ pcsreel
    of
    1000
    LP3470IM5X-2.63/NOPB

    LP3470IM5X-2.63

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide3000
    DIGI-KEYWorldwide985
    MOUSERWorldwide3000
    TAYLORAmericas3000
    TECHMOSAAsia Pacific51800
    		$0.59 each at 1K+ pcsreel
    of
    3000
    LP3470IM5X-2.83/NOPB

    LP3470IM5X-2.83

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$0.59 each at 1K+ pcsreel
    of
    3000
    LP3470IM5X-2.93/NOPB

    LP3470IM5X-2.93

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$0.59 each at 1K+ pcsreel
    of
    3000
    LP3470IM5X-3.08/NOPB

    LP3470IM5X-3.08

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide3000
    DIGI-KEYWorldwide0
    TAYLORAmericas3000
    		$0.59 each at 1K+ pcsreel
    of
    3000
    LP3470IM5X-4.00/NOPB

    LP3470IM5X-4.00

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$0.59 each at 1K+ pcsreel
    of
    3000
    LP3470IM5X-4.38/NOPB

    LP3470IM5X-4.38

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide3000
    		$0.59 each at 1K+ pcsreel
    of
    3000
    LP3470IM5X-4.63/NOPB

    LP3470IM5X-4.63

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$0.59 each at 1K+ pcsreel
    of
    3000
    LP3470M5-2.63/NOPB

    LP3470M5-2.63

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide7000
    AVNET-EMWorldwide5000
    DIGI-KEYWorldwide1338
    MOUSERWorldwide825
    NEWARKAmericas245
    TAYLORAmericas7000
    		$0.56 each at 1K+ pcsreel
    of
    1000
    LP3470M5-2.93/NOPB

    LP3470M5-2.93

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide15250
    AVNET-EMWorldwide1000
    DIGI-KEYWorldwide1175
    MOUSERWorldwide1000
    NEWARKAmericas1404
    TAYLORAmericas15250
    		$0.56 each at 1K+ pcsreel
    of
    1000
    LP3470M5-3.08/NOPB

    LP3470M5-3.08

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide916
    DIGI-KEYWorldwide3974
    MOUSERWorldwide941
    NEWARKAmericas399
    TAYLORAmericas866
    		$0.56 each at 1K+ pcsreel
    of
    1000
    LP3470M5-4.00/NOPB

    LP3470M5-4.00

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide1024
    MOUSERWorldwide744
    		$0.56 each at 1K+ pcsreel
    of
    1000
    LP3470M5-4.38/NOPB

    LP3470M5-4.38

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide1000
    AVNET-EMWorldwide1000
    DIGI-KEYWorldwide0
    MOUSERWorldwide840
    RS COMPONENTSWorldwide898
    TAYLORAmericas1000
    		$0.56 each at 1K+ pcsreel
    of
    1000
    LP3470M5-4.63/NOPB

    LP3470M5-4.63

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide14704
    AVNET-EMWorldwide1000
    CEACAsia Pacific3000
    DIGI-KEYWorldwide48
    MOUSERWorldwide699
    NEWARKAmericas379
    RS COMPONENTSWorldwide288
    TAYLORAmericas14704
    		$0.56 each at 1K+ pcsreel
    of
    1000
    LP3470M5X-2.93/NOPB

    LP3470M5X-2.93

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    TECHMOSAAsia Pacific3000
    		$0.56 each at 1K+ pcsreel
    of
    3000
    LP3470M5X-3.08/NOPB

    LP3470M5X-3.08

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$0.56 each at 1K+ pcsreel
    of
    3000
    LP3470M5X-4.00/NOPB

    LP3470M5X-4.00

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$0.56 each at 1K+ pcsreel
    of
    3000
    LP3470M5X-4.63/NOPB

    LP3470M5X-4.63

    RoHS Status

    SOT-23    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    MOUSERWorldwide3000
    RSL MICROAsia Pacific6000
    TECHMOSAAsia Pacific39000
    		$0.56 each at 1K+ pcsreel
    of
    3000

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LP3470IM5X-3.65
    		LP3470IM5-3.65
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LP3470M5X-2.63
    		LP3470IM5-2.63
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LP3470M5X-4.38
    		LP3470IM5-4.38
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009

    All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

    Moisture Sensitivity Level Data for LP3470.

    A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

    National's certificate of product compliance for LP3470 is located at RoHS Status.

    Part Number(s)
    (NSID)    		Weight
    (milligrams)    		TypePinsMSL RatingPeak ReflowRoHS
    Status    		CAD SymbolsModelsPackage
    Marking
    Format
    LP3470IM5-2.63/NOPB

    LP3470IM5-2.63
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		D25C
    XTT
    LP3470IM5-2.75/NOPB

    LP3470IM5-2.75
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		D38C
    XTT
    LP3470IM5-2.83/NOPB

    LP3470IM5-2.83
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		D39C
    XTT
    LP3470IM5-2.93/NOPB

    LP3470IM5-2.93
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		D26C
    XTT
    LP3470IM5-3.08/NOPB

    LP3470IM5-3.08
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		D28C
    XTT
    LP3470IM5-3.65/NOPB

    LP3470IM5-3.65
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		D37C
    XTT
    LP3470IM5-4.00/NOPB

    LP3470IM5-4.00
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		D29C
    XTT
    LP3470IM5-4.38/NOPB

    LP3470IM5-4.38
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		D30C
    XTT
    LP3470IM5-4.63/NOPB

    LP3470IM5-4.63
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		D31C
    XTT
    LP3470IM5-4.8/NOPB

    LP3470IM5-4.8
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		D15C
    XTT
    LP3470IM5X-2.63/NOPB

    LP3470IM5X-2.63
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		D25C
    XTT
    LP3470IM5X-2.83/NOPB

    LP3470IM5X-2.83
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		D39C
    XTT
    LP3470IM5X-2.93/NOPB

    LP3470IM5X-2.93
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		D26C
    XTT
    LP3470IM5X-3.08/NOPB

    LP3470IM5X-3.08
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		D28C
    XTT
    LP3470IM5X-4.00/NOPB

    LP3470IM5X-4.00
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		D29C
    XTT
    LP3470IM5X-4.38/NOPB

    LP3470IM5X-4.38
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		D30C
    XTT
    LP3470IM5X-4.63/NOPB

    LP3470IM5X-4.63
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		D31C
    XTT
    LP3470M5-2.63/NOPB

    LP3470M5-2.63
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		D25B
    XTT
    LP3470M5-2.93/NOPB

    LP3470M5-2.93
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		D26B
    XTT
    LP3470M5-3.08/NOPB

    LP3470M5-3.08
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		D28B
    XTT
    LP3470M5-4.00/NOPB

    LP3470M5-4.00
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		D29B
    XTT
    LP3470M5-4.38/NOPB

    LP3470M5-4.38
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		D30B
    XTT
    LP3470M5-4.63/NOPB

    LP3470M5-4.63
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		D31B
    XTT
    LP3470M5X-2.93/NOPB

    LP3470M5X-2.93
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		D26B
    XTT
    LP3470M5X-3.08/NOPB

    LP3470M5X-3.08
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		D28B
    XTT
    LP3470M5X-4.00/NOPB

    LP3470M5X-4.00
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		D29B
    XTT
    LP3470M5X-4.63/NOPB

    LP3470M5X-4.63
    		14.696
    14.801
    		SOT-2351
    1    		260
    260    		DetailDownloadN/A
    		D31B
    XTT

    All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

    Moisture Sensitivity Level Data for LP3470.

    A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

    National's certificate of product compliance for LP3470 is located at RoHS Status.

    CAD Symbols and Models
    Download LP3470 CAD Symbols
    		 Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LP3470IM5-2.63CS1001142117108980004254809951
    LP3470IM5-2.75CS1001142117108980004254809951
    LP3470IM5-2.83CS1001142117108980004254809951
    LP3470IM5-2.93CS1001142117108980004254809951
    LP3470IM5-3.08CS1001142117108980004254809951
    LP3470IM5-3.65CS1001142117108980004254809951
    LP3470IM5-4.00CS1001142117108980004254809951
    LP3470IM5-4.38CS1001142117108980004254809951
    LP3470IM5-4.63CS1001142117108980004254809951
    LP3470IM5-4.8CS1001142117108980004254809951
    LP3470IM5X-2.63CS1001142117108980004254809951
    LP3470IM5X-2.83CS1001142117108980004254809951
    LP3470IM5X-2.93CS1001142117108980004254809951
    LP3470IM5X-3.08CS1001142117108980004254809951
    LP3470IM5X-4.00CS1001142117108980004254809951
    LP3470IM5X-4.38CS1001142117108980004254809951
    LP3470IM5X-4.63CS1001142117108980004254809951
    LP3470M5-2.63CS1001142117108980004254809951
    LP3470M5-2.93CS1001142117108980004254809951
    LP3470M5-3.08CS1001142117108980004254809951
    LP3470M5-4.00CS1001142117108980004254809951
    LP3470M5-4.38CS1001142117108980004254809951
    LP3470M5-4.63CS1001142117108980004254809951
    LP3470M5X-2.93CS1001142117108980004254809951
    LP3470M5X-3.08CS1001142117108980004254809951
    LP3470M5X-4.00CS1001142117108980004254809951
    LP3470M5X-4.63CS1001142117108980004254809951

    Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

    For more information on Reliability Metrics, please click here.


    All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

    Moisture Sensitivity Level Data for LP3470.

    A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

    National's certificate of product compliance for LP3470 is located at RoHS Status.

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LP3470IM5X-3.65
    		LP3470IM5-3.65
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LP3470M5X-2.63
    		LP3470IM5-2.63
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    LP3470M5X-4.38
    		LP3470IM5-4.38
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009

    [Information as of 9-Feb-2012]
    Copyright © 2011 National Semiconductor Corporation