74HC244

MM74HCT240

InvertingOctalTRI-STATE󰀂BufferMM74HCT244

OctalTRI-STATEBuffer

GeneralDescription

TheseTRI-STATEbuffersutilizeadvancedsilicon-gateCMOStechnologyandaregeneralpurposehighspeedin-vertingandnon-invertingbuffers󰀟Theypossesshighdrivecurrentoutputswhichenablehighspeedoperationevenwhendrivinglargebuscapacitances󰀟ThesecircuitsachievespeedscomparabletolowpowerSchottkydevices󰀷whileretainingthelowpowerconsumptionofCMOS󰀟AllthreedevicesareTTLinputcompatibleandhaveafanoutof15LS-TTLequivalentinputs󰀟

MM74HCTdevicesareintendedtointerfacebetweenTTLandNMOScomponentsandstandardCMOSdevices󰀟Thesepartsarealsoplug-inreplacementsforLS-TTLdevic-esandcanbeusedtoreducepowerconsumptioninexist-ingdesigns󰀟

TheMM74HCT240isaninvertingbufferandtheMM74HCT244isanon-invertingbuffer󰀟Eachdevicehastwoactivelowenables(1Gand2G)󰀷andeachenableinde-pendentlycontrols4buffers󰀟

Allinputsareprotectedfromdamageduetostaticdis-chargebydiodestoVCCandGround󰀟

Features

YYYYY

TTLinputcompatible

Typicalpropagationdelay󰀌14ns

TRI-STATEoutputsforconnectiontosystembusesLowquiescentcurrent󰀌80mA

Highoutputdrivecurrent󰀌6mA(min)

TRI-STATE󰀂isaregisteredtrademarkofNationalSemiconductorCorp󰀟

ConnectionDiagrams

Dual-In-LinePackages

TL󰁋F󰁋5365–1

TopView

OrderNumberMM74HCT240

TL󰁋F󰁋5365–3

TopView

OrderNumberMM74HCT244

C1996NationalSemiconductorCorporationTL󰁋F󰁋5365RRD-B30M86󰁋PrintedinU󰀟S󰀟A󰀟

http󰀌󰁋󰁋www󰀟national󰀟com

(Notes1󰁅2)

IfMilitary󰁋Aerospacespecifieddevicesarerequired󰀷pleasecontacttheNationalSemiconductorSalesOffice󰁋Distributorsforavailabilityandspecifications󰀟SupplyVoltage(VCC)DCInputVoltage(VIN)DCOutputVoltage(VOUT)ClampDiodeCurrent(IIK󰀷IOK)

b0󰀟5toa7󰀟0Vb1󰀟5toVCCa1󰀟5Vb0󰀟5toVCCa0󰀟5V

g20mA

AbsoluteMaximumRatingsOperatingConditions

SupplyVoltage(VCC)DCInputorOutputVoltage(VIN󰀷VOUT)

OperatingTemp󰀟Range(TA)MM74HCT

InputRiseorFallTimes(tr󰀷tf)

Min4󰀟50

Max5󰀟5VCC

UnitsVV

b40a85󰀃C

ns

g35mADCOutputCurrent󰀷perpin(IOUT)

g70mADCVCCorGNDCurrent󰀷perpin(ICC)

b65󰀃Ctoa150󰀃CStorageTemperatureRange(TSTG)

PowerDissipation(PD)(Note3)600mWS󰀟O󰀟Packageonly500mWLeadTemp󰀟(TL)(Soldering10seconds)260󰀃C

500

DCElectricalCharacteristics

VCCe5Vg10%(unlessotherwisespecified)

TAe25󰀃C

SymbolVIHVILVOH

ParameterMinimumHighLevel

InputVoltageMaximumLowLevelInputVoltageMinimumHighLevelOutputVoltage

VIN-EEeVIHorVILlIOUTle20mA

lIOUTle6󰀟0mA󰀷VCCe4󰀟5VlIOUTle7󰀟2mA󰀷VCCe5󰀟5VVINeVIHorVILlIOUTle20mA

lIOUTle6󰀟0mA󰀷VCCe4󰀟5VlIOUTle7󰀟2mA󰀷VCCe5󰀟5VVINeVCCorGND󰀷VIHorVIL

VOUTeVCCorGNDGeVIHGeVIL

VINeVCCorGNDIOUTe0mA

VINe2󰀟4Vor0󰀟5V(Note4)

Note2󰀌Unlessotherwisespecifiedallvoltagesarereferencedtoground󰀟

Note3󰀌PowerDissipationtemperaturederating󰁚plastic‘‘N’’package󰀌b12mW󰁋󰀃Cfrom65󰀃Cto85󰀃C󰀟Note4󰀌Measuredperinput󰀟AllotherinputsatVCCorGND󰀟

Conditions

Typ

2󰀟00󰀟8

74HCT

TAeb40to85󰀃CGuaranteedLimits

2󰀟00󰀟8

TAe125󰀃C

Units

2󰀟00󰀟8

VV

VCC4󰀟25󰀟200󰀟20󰀟2

VCCb0󰀟13󰀟984󰀟980󰀟10󰀟260󰀟26

g0󰀟05g0󰀟25

VCCb0󰀟13󰀟844󰀟840󰀟10󰀟330󰀟33

g0󰀟5g2󰀟5

VCCb0󰀟13󰀟74󰀟70󰀟10󰀟40󰀟4

g1󰀟0g10

VVVVVVmAmA

VOL

MaximumLowLevelVoltage

IINIOZ

MaximumInputCurrent

MaximumTRI-STATEOutputLeakageCurrent

MaximumQuiescentSupplyCurrent

ICC

4󰀟0

0󰀟6

1󰀟0

401󰀟3

1601󰀟5

mAmA

Note1󰀌AbsoluteMaximumRatingsarethosevaluesbeyondwhichdamagetothedevicemayoccur󰀟

TruthTables

’HCT240

1GLLHH

1ALHLH

1YHLZZ

2GLLHH

2ALHLH

2YHLZZ

1GLLHH

1ALHLH

’HCT2441YLHZZ

2GLLHH

2ALHLH

2YLHZZ

Hehighlevel󰀷Lelowlevel󰀷Zehighimpedance

http󰀌󰁋󰁋www󰀟national󰀟com2

ACElectricalCharacteristicsMM74HCT240󰀷MM74HCT244VCCe5󰀟0V󰀷tretfe6ns󰀷TAe25󰀃C(unless

otherwisespecified)SymboltPHL󰀷tPLHtPZL󰀷tPZHtPLZ󰀷tPHZ

ParameterMaximumOutputPropagationDelayMaximumOutputEnableTimeMaximumOutputDisableTime

ConditionsCLe45pFCLe45pFRLe1kXCLe5pFRLe1kX

Typ142016

GuaranteedLimits

183025

Unitsnsnsns

ACElectricalCharacteristicsMM74HCT240󰀷MM74HCT244VCCe5󰀟0Vg10%󰀷tretfe6ns(unless

otherwisespecified)

TAe25󰀃C

SymboltPHL󰀷tPLHtPZH󰀷tPZLtPHZ󰀷tPLZtTHL󰀷tTLHCINCOUTCPD

ParameterMaximumOutputPropagationDelayMaximumOutputEnableTimeMaximumOutputDisableTimeMaximumOutputRiseandFallTimeMaximumInputCapacitanceMaximumOutputCapacitancePowerDissipationCapacitance(Note5)

(perbuffer)

GeVCC󰀷GeGNDGeGND󰀷GeVCC

Conditions

Typ

CLe50pFCLe150pFRLe1kXRLe1kXCLe50pFCLe50pF

CLe50pFCLe150pF

142021261661015

2028304225121520

74HCTTAeb40to85󰀃C

2535385332151520

TAe125󰀃C

Units

3042456338181520

nsnsnsnsnsnspFpF

GuaranteedLimits

590pFpF

Note5󰀌CPDdeterminesthenoloaddynamicpowerconsumption󰀷PDeCPDVCC2faICCVCC󰀷andthenoloaddynamiccurrentconsumption󰀷ISeCPDVCCfaICC󰀟

3http󰀌󰁋󰁋www󰀟national󰀟com

LogicDiagrams

’HCT240

’HCT244

TL󰁋F󰁋5365–4TL󰁋F󰁋5365–6

http󰀌󰁋󰁋www󰀟national󰀟com4

5http󰀌󰁋󰁋www󰀟national󰀟com

PhysicalDimensionsinches(millimeters)unlessotherwisenoted

OrderNumberMM74HCT240WMorMM74HCT244WM

NSPackageM20B

http󰀌󰁋󰁋www󰀟national󰀟com6

PhysicalDimensionsinches(millimeters)unlessotherwisenoted(Continued)

OrderNumberMM74HCT240MTCorMM74HCT244MTC

NSPackageMTC20

7http󰀌󰁋󰁋www󰀟national󰀟com

MM74HCT240󰁋MM74HCT244PhysicalDimensionsinches(millimeters)unlessotherwisenoted(Continued)

OrderNumberMM74HCT240N󰀷orMM74HCT244N

NSPackageN20A

LIFESUPPORTPOLICY

NATIONAL’SPRODUCTSARENOTAUTHORIZEDFORUSEASCRITICALCOMPONENTSINLIFESUPPORTDEVICESORSYSTEMSWITHOUTTHEEXPRESSWRITTENAPPROVALOFTHEPRESIDENTOFNATIONALSEMICONDUCTORCORPORATION󰀟Asusedherein󰀌1󰀟Lifesupportdevicesorsystemsaredevicesorsystemswhich󰀷(a)areintendedforsurgicalimplantintothebody󰀷or(b)supportorsustainlife󰀷andwhosefailuretoperform󰀷whenproperlyusedinaccordancewithinstructionsforuseprovidedinthelabeling󰀷canbereasonablyexpectedtoresultinasignificantinjurytotheuser󰀟

NationalSemiconductorCorporation1111WestBardinRoad2󰀟Acriticalcomponentisanycomponentofalifesupportdeviceorsystemwhosefailuretoperformcanbereasonablyexpectedtocausethefailureofthelifesupportdeviceorsystem󰀷ortoaffectitssafetyoreffectiveness󰀟

NationalSemiconductorEuropeFax󰀌a49(0)180-5308586NationalSemiconductorLtd󰀟13thFloor󰀷StraightBlock󰀷NationalSemiconductorJapanLtd󰀟Tel󰀌81-043-299-2308