2732芯片资料

NTE2732AIntegratedCircuit32K(4Kx8)NMOSUVErasablePROMDescription:TheNTE2732Aisa32,768–bitsultravioleterasableandelectricallyprogrammableread–onlymemory(EPROM)organizedas4,096wordsby8bitsandmanufacturedusingN–ChannelSi–GateMOSprocessing.Withitssingle+5Vpowersupplyandwithanaccesstimeof200ns,theNTE2732Aisidealforusewithhighperformance+5VmicroprocessorssuchastheNTE3880.TheNTE2732Ahasanimportantfeaturewhichistheseparateoutputcontrol,OutputEnable(OE)fromtheChipEnablecontrol(CE).TheOEcontroleliminatesbuscontentioninmultiplebusmicropro-cessorsystems.TheNTE2732Aalsofeaturesanstandbymodewhichreducesthepowerdissipationwithoutincreas-ingaccesstime.Theactivecurrentis125mAwhilethemaximumstandbymodeisachievedbyapply-ingaTTL–highsignaltotheCEinput.Features:
FastAccessTime:200nsMax
0°to+70°CStandardTemperatureRange
Single+5VPowerSupply
LowStandbyCurrent(35mAMax)
InputsandOutputsTTLCompatibleDuringReadandProgram
CompletelyStaticAbsoluteMaximumRatings:(Note1)AllInputorOutputVoltageswithrespecttoGND,VI+6to–0.6V.............................SupplyVoltagewithrespecttoGNDduringProgram,Vpp+22to–0.6V.......................AmbientTemperatureunderBias,TA–10°to+80°C........................................StorageTemperatureRange,Tstg–65°to+125°C..........................................Note1.Stressesabovethoselistedunder“AbsoluteMaximumRatings”maycausepermanentdamagetothedevice.Thisisastressratingonlyandfunctionaloperationofthedeviceattheseoranyotherconditionsabovethoseindicatedintheoperationalsectionsofthisspecifi-cationisnotimplied.Exposuretoabsolutemaximumratingconditionsforextendedperiodsmayaffectdevicereliability.OperatingModes:PINSCEOE/VppVCCOUTPUTSMODE(18)(20)(24)(9–11,13–17)READVILVIL+5DOUTSTANDBYVIHDon’tCare+5HIGHZPROGRAMVILVPP+5DINPROGRAMVERIFTYVILVIL+5DOUTPROGRAMINHIBITVIHVPP+5HIGHZReadOperation(DCandACConditions):OperatingTemperatureRange,Topr0°to+70°C...........................................VCCPowerSupply(Note2,Note3)5V±5%..............................................VppVoltage(Note3)Vpp=VCC.........................................................Note2.VCCmustbeappliedsimultaneouslywithorbeforeVPPandremovedsimultaneouslyorafterVPP.Note3.VPPmaybeconnecteddirectlytoVCCexceptduringprogramming.ThesupplycurrentwouldthenbethesumofICCandIPP1.DCandOperatingCharacteristics:ParameterSymbolTestConditionsMinTypMaxUnitInputLoadCurrentILIVIN=5.5V––10µAOutputLeakageCurrentILOVOUT=5.5V––10µAVCCCurrentStandbyICC1CE=VIH,OE=VIL,Note3––35mAVCCCurrentStandbyICC2CE=OE=VIL,Note3–70125mAInputLowVoltageVIL–0.1–+0.8VInputHighVoltageVIH2.0VCC+1VOutputLowVoltageVOLIOL=2.1mA––0.45VOutputHighVoltageVOHIOH=–400µA2.4––VNote3.VPPmaybeconnecteddirectlytoVCCexceptduringprogramming.ThesupplycurrentwouldthenbethesumofICCandIPP1.Note4.TypicalvaluesareforTA=+25°Candnominalsupplyvoltages.ACCharacteristics:ParameterSymbolTestConditionsMinTypMaxUnitAddresstoOutputDelaytACCCE=OE=VIL––200nsCEtoOutputDelaytCEOE=VIL––200nsOEtoOutputDelaytOECE=VIL––100nsOEHightoOutputFloattDFCE=VIL,Note50–60nsOutputHoldfromAddressesCEorOEwhicheveroccurredfirsttOHCE=OE=VIL0––nsNote4.TypicalvaluesareforTA=+25°Candnominalsupplyvoltages.Note5.Thisparameterisonlysampledandisnot100%tested.Capacitance:(TA=+25°C,f=1MHz,Note5unlessotherwisespecified)ParameterSymbolTestConditionsMinTypMaxUnitInputCapacitanceexceptOE/VppCIN1VIN=0–46pFOE/VppInputCapacitanceCIN2VIN=0––20pFOutputcapacitanceCOUTVOUT=0–812pFNote4.TypicalvaluesareforTA=+25°Candnominalsupplyvoltages.Note5.Thisparameterisonlysampledandisnot100%tested.ReadOperation(ACTestConditions):OutputLoad:100pF+1TTLGateInputRiseandFallTimes:≤20nsInputPulseLevels:0.45to2.4VTimingMeasurementReferenceLevels:Inputs0.8and2V/0.8and2VACWaveforms:ADDRESSESADDRESSESVALIDCEOEOUTPUTHIGHZVALIDOUTPUTHIGHZtCEtACCtOHtDE(Note6)tDE(Note7)Note6.OEmaybedelayeduptotACC–tOEafterthefallingedgeCEwithoutimpactontACC.Note7.tDFisspecifiedfromOEorCEwhicheveroccursfirst.ReadMode:TheNTE2732Ahastwocontrolfunctions,bothofwhichmustbelogicallysatisfiedinordertoobtaindataattheoutputs.ChipEnable(CE)isthepowercontrolandshouldbeusedfordeviceselection.OutputEnable(OE)istheoutputcontrolandshouldbeusedtogatedatatotheoutputpins,indepen-dentofdeviceselection.Assumingthataddressesarestable,addressaccesstime(tACC)isequaltodelayfromCEtooutput(tCE).DataisavailableattheoutputsafterthefallingedgeofOE,assumingthatCEhasbeenlowandaddresseshavebeenstableforatleasttACC–tOE.StandbyMode:TheNTE2732Ahasastandbymodewhichreducestheactivepowercurrentby70%,from125mAto35mA.TheNTE2732AisplacedinthestandbymodebyapplyingaTTLhighsignaltoCEinput.Wheninstandbymode,theoutputsareinahighimpedancestate,independentoftheOEinput.OutputOR–Tieing:BecauseNTE2732A’sareusuallyusedinlargermemoryarrays,theproductfeaturesa2linecontrolfunctionwhichaccommodatestheuseofmultiplememoryconnection.Thetwolinecontrolfunctionallows:a)thelowestpossiblememorypowerdissipationb)completeassurancethatoutputbuscontentionwillnotoccurTomostefficientlyusethesetwocontrollines,itisrecommendedthatCEbedecodedandusedastheprimarydeviceselectingfunction,whil