LTC4300A-1IMS8#PBF中文资料

LTC4300A-1/LTC4300A-21sn4300a124300a12fsTheLTC®4300Aserieshotswappable2-wirebusbuffersallowI/Ocardinsertionintoalivebackplanewithoutcorruptionofthedataandclockbusses.Whenthecon-nectionismade,theLTC4300A-1/LTC4300A-2providebidirectionalbuffering,keepingthebackplaneandcardcapacitancesisolated.Rise-timeacceleratorcircuitry*allowstheuseofweakerDCpull-upcurrentswhilestillmeetingrise-timerequirements.Duringinsertion,theSDAandSCLlinesareprechargedto1Vtominimizebusdisturbances.TheLTC4300A-1incorporatesaCMOSthresholddigitalENABLEinputpin,whichforcesthepartintoalowcurrentmodewhendriventogroundandsetsnormaloperationwhendriventoVCC.ItalsoincludesanopendrainREADYoutputpin,whichindicatesthatthebackplaneandcardsidesareconnectedtogether.TheLTC4300A-2replacestheENABLEpinwithadedicatedsupplyvoltagepin,VCC2,forthecardside,providinglevelshiftingbetween3.3Vand5Vsystems.Boththebackplaneandcardmaybepoweredwithsupplyvoltagesrangingfrom2.7Vto5.5V,withnocontraintsonwhichsupplyvoltageishigher.TheLTC4300A-2alsore-placestheREADYpinwithadigitalCMOSinputpin,ACC,whichenablesanddisablestherise-timeacceleratorcurrents.TheLTC4300Aisavailableinasmall8-pinMSOPpackage.nHotBoardInsertionnServersnCapacitanceBuffer/BusExtendernDesktopComputer,LTCandLTareregisteredtrademarksofLinearTechnologyCorporation.nBidirectionalBufferforSDAandSCLLinesIncreasesFanoutnPreventsSDAandSCLCorruptionDuringLiveBoardInsertionandRemovalfromBackplanenIsolatesInputSDAandSCLLinesfromOutputnCompatiblewithI2CTM,I2CFastModeandSMBusStandards(Upto400kHzOperation)nSmallMSOP8-PinPackagenLowICCChipDisable:1mA(LTC4300A-1)nREADYOpenDrainOutput(LTC4300A-1)n1VPrechargeonallSDAandSCLLinesnSupportsClockStretching,ArbitrationandSynchronizationn5Vto3.3VLevelTranslation(LTC4300A-2)nHighImpedanceSDA,SCLPinsforVCC=0VHotSwappable2-WireBusBuffersI2CisatrademarkofPhilipsElectronicsN.V.*U.S.PatentNo.6,650,174R110kVCC3.3VR210kENABLESCLINSCLOUTSDAINSDAOUT15467328GNDLTC4300A-1READYC10.01μF4300A-1/2TA01R310kR410kAPPLICATIOSUFEATURESTYPICALAPPLICATIOUDESCRIPTIOUInput–OutputConnectiontPLHOUTPUTSIDE50pFINPUTSIDE150pF4300ATA02LTC4300A-1/LTC4300A-22sn4300a124300a12fsVCCtoGND....................................................–0.3to7VVCC2toGND(LTC4300A-2)...........................–0.3to7VSDAIN,SCLIN,SDAOUT,SCLOUT.................–0.3to7VREADY,ENABLE(LTC4300A-1)....................–0.3to7VACC(LTC4300A-2)........................................–0.3to7VOperatingTemperatureRangeLTC4300A-1C/LTC4300A-2C...................0Cto70CLTC4300A-1I/LTC4300A-2I................–40Cto85CStorageTemperatureRange.................–65Cto125CLeadTemperature(Soldering,10sec)..................300CORDERPARTNUMBERMS8PARTMARKINGTJMAX=125C,qJA=200C/WConsultLTCmarketingforpartsspecifiedwithwideroperatingtemperatureranges.LTABFLTABGLTACFLTACGLTC4300A-1CMS8LTC4300A-1IMS8LTC4300A-2CMS8LTC4300A-2IMS8ABSOLUTEAXIURATIGS(Note1)ELECTRICALCHARACTERISTICSTheldenotesthespecificationswhichapplyoverthefulloperatingtemperaturerange,otherwisespecficationsareatTA=25C.VCC=2.7Vto5.5V,unlessotherwisenoted.1234ENABLE/VCC2*SCLOUTSCLINGND8765VCCSDAOUTSDAINREADY/ACC*TOPVIEWMS8PACKAGE8-LEADPLASTICMSOP*LTC4300A-2SYMBOLPARAMETERCONDITIONSMINTYPMAXUNITSPowerSupplyVCCPositiveSupplyVoltagel2.75.5VICCSupplyCurrentVCC=5.5V,VSDAIN=VSCLIN=0V,LTC4300A-1l5.17mAISDSupplyCurrentinShutdownModeVENABLE=0V,LTC4300A-10.1mAVCC2CardSideSupplyVoltageLTC4300A-2l2.75.5VIVCC1VCCSupplyCurrentVSDAIN=VSCLIN=0V,VCC1=VCC2=5.5V,34.1mALTC4300A-2IVCC2VCC2SupplyCurrentVSDAOUT=VSCLOUT=0V,VCC1=VCC2=5.5V,2.12.9mALTC4300A-2Start-UpCircuitryVPREPrechargeVoltageSDA,SCLFloatingl0.81.01.2VtIDLEBusIdleTimel5095150msVENENABLEThresholdVoltageLTC4300A-10.5•VCC0.9•VCCVVDISDisableThresholdVoltageLTC4300A-1,ENABLEPin0.1•VCC0.5•VCCVIENENABLEInputCurrentENABLEfrom0VtoVCC,LTC4300A-1–0.1–1mAtPHLENABLEDelay,On-OffLTC4300A-110nsREADYDelay,Off-OnLTC4300A-110nstPLHENABLEDelay,Off-OnLTC4300A-195msREADYDelay,On-OffLTC4300A-110nsIOFFREADYOFFStateLeakageCurrentLTC4300A-1–0.1mAVOLREADYOutputLowVoltageIPULLUP=3mA,LTC4300A-1l0.4VLTC4300A-1/LTC4300A-23sn4300a124300a12fsNote1:AbsoluteMaximumRatingsarethosevaluesbeyondwhichthelifeofadevicemaybeimpairedNote2:IPULLUPACvarieswithtemperatureandVCCvoltage,asshownintheTypicalPerformanceCharacteristicssection.Note3:Theconnectioncircuitryalwaysregulatesitsoutputtoahighervoltagethanitsinput.ThemagnitudeofthisoffsetvoltageasafunctionofthepullupresistorandVCCvoltageisshownintheTypicalPerformanceCharacteristicssection.ELECTRICALCHARACTERISTICSTheldenotesthespecificationswhichapplyoverthefulloperatingtemperaturerange,otherwisespecficationsareatTA=25C.VCC=2.7Vto5.5V,unlessotherwisenoted.SYMBOLPARAMETERCONDITIONSMINTYPMAXUNITSRise-TimeAcceleratorsIPULLUPACTransientBoostedPull-UpCurrentPositiveTransitiononSDA,SCL,VCC=2.7V,12mASlewRate=1.25V/ms(Note2),LTC4300A-2,ACC=0.7•VCC2,VCC2=2.7VVACCDISAcceleratorDisableThresholdLTC4300A-20.3•VCC20.5•VCC2VVACCENAcceleratorEnableThresholdLTC4300A-20.5•VCC20.7•VCC2VIVACCACCInputCurrentLTC4300A-2–0.1–1mAtPDOFFACCD