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TIA/EIASTANDARDElectricalCharacteristicsofLowVoltageDifferentialSignaling(LVDS)InterfaceCircuitsTIA/EIA-644-A(RevisionofTIA/EIA-644)FEBRUARY2001TELECOMMUNICATIONSINDUSTRYASSOCIATIONTheTelecommunicationsIndustryAssociationRepresentstheCommunicationsSectorofANSI/TIA/EIA-644-A-2001Approved:January30,2001TIA/EIA-644-ANOTICETIA/EIAEngineeringStandardsandPublicationsaredesignedtoservethepublicinterestthrougheliminatingmisunderstandingsbetweenmanufacturersandpurchasers,facilitatinginterchangeabilityandimprovementofproducts,andassistingthepurchaserinselectingandobtainingwithminimumdelaytheproperproductforhisparticularneed.ExistenceofsuchStandardsandPublicationsshallnotinanyrespectprecludeanymemberornonmemberofTIA/EIAfrommanufacturingorsellingproductsnotconformingtosuchStandardsandPublications,norshalltheexistenceofsuchStandardsandPublicationsprecludetheirvoluntaryusebythoseotherthanTIA/EIAmembers,whetherthestandardistobeusedeitherdomesticallyorinternationally.StandardsandPublicationsareadoptedbyTIA/EIAinaccordancewiththeAmericanNationalStandardsInstitute(ANSI)patentpolicy.Bysuchaction,TIA/EIAdoesnotassumeanyliabilitytoanypatentowner,nordoesitassumeanyobligationwhatevertopartiesadoptingtheStandardorPublication.ThisStandarddoesnotpurporttoaddressallsafetyproblemsassociatedwithitsuseorallapplicableregulatoryrequirements.ItistheresponsibilityoftheuserofthisStandardtoestablishappropriatesafetyandhealthpracticesandtodeterminetheapplicabilityofregulatorylimitationsbeforeitsuse.(FromStandardsProposalNo.4584,formulatedunderthecognizanceoftheTIATR-30.2SubcommitteeonDTE-DCEInterfacesProtocols.)Publishedby©TELECOMMUNICATIONSINDUSTRYASSOCIATION2001StandardsandTechnologyDepartment2500WilsonBoulevardArlington,VA22201PRICE:PleaserefertocurrentCatalogofEIAELECTRONICINDUSTRIESALLIANCESTANDARDSandENGINEERINGPUBLICATIONSorcallGlobalEngineeringDocuments,USAandCanada(1-800-854-7179)International(303-397-7956)AllrightsreservedPrintedinU.S.A.ELECTRICALCHARACTERISTICSOFLOWVOLTAGEDIFFERENTIALSIGNALING(LVDS)INTERFACECIRCUITS(FromTIA/EIAStandardTIA/EIA-644andStandardsProposalNo.4584formulatedunderthecognizanceofTIASubcommitteeTR-30.2onDataTransmissionInterfacesandProtocols)ContentsPage1SCOPE.................................................................................................................................12DEFINITIONS,SYMBOLSANDABBREVIATIONS.....................................................22.1Datasignalingrate................................................................................................22.2DTE.........................................................................................................................22.3DCE........................................................................................................................22.4LVDS......................................................................................................................22.5Star(*)....................................................................................................................23APPLICABILITY...................................................................................................................33.1Generalapplicability.............................................................................................33.2Datasignalingrate................................................................................................34ELECTRICALCHARACTERISTICS...............................................................................54.1Generatorcharacteristics.....................................................................................54.1.1Fullloadtestmeasurements...............................................................................64.1.2Offsetvoltageandbalancemeasurements........................................................74.1.3Short-circuitmeasurements.................................................................................84.1.4Outputsignalwaveform........................................................................................84.1.5Dynamicoutputsignalbalance............................................................................94.2Loadcharacteristics...........................................................................................104.2.1Receiverinputcurrent-voltagemeasurements...............................................114.2.2Receiverinputbalancemeasurements............................................................114.2.3Terminatingreceiverinputcurrent-voltagemeasurementsandinputimpedancemeasurements................................................................................124.2.4Receiverinputsensitivitymeasurements.........................................................144.2.5Mediatermination...............................................................................................154.3Interconnectingmediaelectricalcharacteristics..............................................164.3.1Cablemedia..................................