National Semiconductor | High-performance Analog

 

 DS8921   
Differential Line Drivers and Receiver Pair 		Click link to Download

Features
  • 12 ns typical propagation delay
  • Output skew - 0.5 ns typical
  • Meet the requirements of EIA Standard RS-422
  • Complementary Driver Outputs
  • High differential or common-mode input voltage ranges of ±7V
  • ±0.2V receiver sensitivity over the input voltage range
  • Receiver input hysteresis-70 mV typical
  • DS8921AT industrial temperature operation: (-40°C to +85°C)

    • Description

    The DS8921, DS8921A are Differential Line Driver and Receiver pairs designed specifically for applications meeting the ST506, ST412 and ESDI Disk Drive Standards. In addition, these devices meet the requirements of the EIA Standard RS-422.

    The DS8921, DS8921A receivers offer an input sensitivity of 200 mV over a ±7V common mode operating range. Hysteresis is incorporated (typically 70 mV) to improve noise margin for slowly changing input waveforms.

    The DS8921, DS8921A drivers are designed to provide unipolar differential drive to twisted pair or parallel wire transmission lines. Complementary outputs are logically ANDed and provide an output skew of 0.5 ns (typ.) with propagation delays of 12 ns.

    The DS8921, DS8921A are designed to be compatible with TTL and CMOS.




    Typical Application
    click for larger image


    		Connection Diagram
    click for larger image


     

    ParametersValues
    Drivers 1
    Receivers 1
    SupplyVoltage 5 Volt
    Process Bipolar
    Temperature Min -40, 0 deg C
    Temperature Max 85, 70 deg C

    Datasheets
    TitleSizeDateOther
    Language
    DS8921 Differential Line Drivers and Receiver Pair655
    Kbytes    		19-Nov-04日本語  


    Application Notes
    TitleSizeDateOther
    Language
    AN-457: Application Note 457 High Speed, Low Skew RS-422 Drivers and Receivers Solve Critical System Timing Problems212
    Kbytes    		2-Oct-02日本語

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    DS8921AM/NOPB

    DS8921AM

    RoHS Status

    SOIC NARROW    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide80
    AVNET-EMWorldwide1520
    DIGI-KEYWorldwide1270
    FARNELLEurope and Asia135
    MOUSERWorldwide755
    NEWARKAmericas642
    RS COMPONENTSWorldwide15
    TAYLORAmericas935
    		$0.50 each at 1K+ pcsrail
    of
    95
    DS8921AMX/NOPB

    DS8921AMX

    RoHS Status

    SOIC NARROW    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide2500
    AVNET-EMWorldwide875
    DIGI-KEYWorldwide0
    MOUSERWorldwide2500
    TAYLORAmericas2500
    		$0.50 each at 1K+ pcsreel
    of
    2500
    DS8921ATM/NOPB

    DS8921ATM

    RoHS Status

    SOIC NARROW    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide4097
    AVNET-EMWorldwide285
    DIGI-KEYWorldwide763
    MOUSERWorldwide759
    NEWARKAmericas37
    TAYLORAmericas4097
    		$0.50 each at 1K+ pcsrail
    of
    95
    DS8921M/NOPB

    DS8921M

    RoHS Status

    SOIC NARROW    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide380
    AVNET-EMWorldwide238
    DIGI-KEYWorldwide769
    MOUSERWorldwide754
    NEWARKAmericas44
    RS COMPONENTSWorldwide35
    TAYLORAmericas380
    		$0.47 each at 1K+ pcsrail
    of
    95
    DS8921MX/NOPB

    DS8921MX

    RoHS Status

    SOIC NARROW    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    AVNET-EMWorldwide35000
    DIGI-KEYWorldwide0
    		$0.47 each at 1K+ pcsreel
    of
    2500
    DS8921N/NOPB

    DS8921N

    RoHS Status

    MDIP    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide655
    AVNET-EMWorldwide799
    DIGI-KEYWorldwide620
    FARNELLEurope and Asia1154
    MOUSERWorldwide187
    NEWARKAmericas750
    RS COMPONENTSWorldwide245
    TAYLORAmericas2357
    		$0.54 each at 1K+ pcsrail
    of
    40

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    DS8921AN
    		NONE
    		NATIONAL SEMICONDUCTOR
    		03 Mar 2006
    DS8921ATJ
    		NONE
    		NONE
    		08 Sep 1998
    DS8921ATMX
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    DS8921ATN
    		NONE
    		NONE
    		09 Mar 1999

    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 DS8921.

    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 DS8921 is located at RoHS Status.

    Part Number(s)
    (NSID)    		Weight
    (milligrams)    		TypePinsMSL RatingPeak ReflowRoHS
    Status    		CAD SymbolsModelsPackage
    Marking
    Format
    DS8921AM/NOPB

    DS8921AM
    		69.761
    70.001
    		SOIC NARROW81
    1    		260
    235    		DetailDownloadN/A
    		NSZXTT
    DS89
    21AM
    DS8921AMX/NOPB

    DS8921AMX
    		69.761
    70.001
    		SOIC NARROW81
    1    		260
    235    		DetailDownloadN/A
    		NSZXTT
    DS89
    21AM
    DS8921ATM/NOPB

    DS8921ATM
    		69.761
    70.001
    		SOIC NARROW81
    1    		260
    235    		DetailDownloadN/A
    		NSZXTT
    DS892
    1ATM
    DS8921M/NOPB

    DS8921M
    		69.761
    70.001
    		SOIC NARROW81
    1    		260
    235    		DetailDownloadN/A
    		NSZXTT
    DS892
    1M
    DS8921MX/NOPB

    DS8921MX
    		69.761
    70.001
    		SOIC NARROW81
    1    		260
    235    		DetailDownloadN/A
    		NSZXTT
    DS892
    1M
    DS8921N/NOPB

    DS8921N
    		508.252
    510.002
    		MDIP81
    1    		NA
    NA    		DetailDownloadN/A
    		NSUZXYTTE#
    DS8921N

    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 DS8921.

    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 DS8921 is located at RoHS Status.

    CAD Symbols and Models
    Download DS8921 CAD Symbols
    		 Models
    N/A


    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    DS8921AN
    		NONE
    		NATIONAL SEMICONDUCTOR
    		03 Mar 2006
    DS8921ATJ
    		NONE
    		NONE
    		08 Sep 1998
    DS8921ATMX
    		NONE
    		NATIONAL SEMICONDUCTOR
    		01 Dec 2009
    DS8921ATN
    		NONE
    		NONE
    		09 Mar 1999

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