电子技术-芯片资料-74LS155.pdf

TL/F/639554LS155/DM54LS155/DM74LS155,54LS156/DM54LS156/DM74LS156 Dual 2-Line to 4-Line Decoders/DemultiplexersJune 198954LS155/DM54LS155/DM74LS155,54LS156/DM54LS156/DM74LS156Dual 2-Line to 4-Line Decoders/DemultiplexersGeneral DescriptionThese TTL circuits feature dual 1-line-to-4-line demultiplex-ers with individual strobes and common binary-address in-puts in a single 16-pin package.When both sections areenabled by the strobes,the common address inputs se-quentially select and route associated input data to the ap-propriate output of each section.The individual strobes per-mit activating or inhibiting each of the 4-bit sections as de-sired.Data applied to input C1 is inverted at its outputs anddata applied at C2 is true through its outputs.The inverterfollowing the C1 data input permits use as a 3-to-8-line de-coder,or 1-to-8-line demultiplexer,without external gating.Input clamping diodes are provided on these circuits to mini-mize transmission-line effects and simplify system design.FeaturesYApplications:Dual 2-to-4-line decoderDual 1-to-4-line demultiplexer3-to-8-line decoder1-to-8-line demultiplexerYIndividual strobes simplify cascading for decoding ordemultiplexing larger wordsYInput clamping diodes simplify system designYChoice of outputs:Totem-pole(LS155)Open-collector(LS156)YAlternate Military/Aerospace device(54LS155/156)isavailable.Contact a National Semiconductor Sales Of-fice/Distributor for specifications.Connection Diagram and Function TablesDual-In-Line PackageTL/F/639513-Line-to-8-Line Decoder or1-Line-to-8-Line DemultiplexerInputsOutputsSelectStrobe(0)(1)(2)(3)(4)(5)(6)(7)Or DataCB AG2Y0 2Y1 2Y2 2Y3 1Y0 1Y1 1Y2 1Y3XX XHHHHHHHHHLL LLLHHHHHHHLL HLHLHHHHHHLH LLHHLHHHHHLH HLHHHLHHHHHL LLHHHHLHHHHL HLHHHHHLHHH H LLHHHHHHLHH H HLHHHHHHHLOrder Number 54LS155DMQB,54LS155FMQB,54LS155LMQB,DM54LS155J,DM54LS155W,DM74LS155M,DM74LS155N,54LS156DMQB,54LS156FMQB,DM54LS156J,DM54LS156W,DM74LS156M or DM74LS156NSee NS Package Number E20A,J16A,M16A,N16E or W16A2-Line-to-4-Line Decoder or1-Line-to-4-Line DemultiplexerInputsOutputsSelectStrobeDataBAG1C11Y01Y11Y21Y3XXHXHHHHLLLHLHHHLHLHHLHHHLLHHHLHHHLHHHHLXXXLHHHHInputsOutputsSelectStrobeDataBAG2C22Y02Y12Y22Y3XXHXHHHHLLLLLHHHLHLLHLHHHLLLHHLHHHLLHHHLXXXHHHHHCeinputs C1 and C2 connected togetherGeinputs G1 and G2 connected togetherHehigh level,Lelow level,Xedont careC1995 National Semiconductor CorporationRRD-B30M105/Printed in U.S.A.Absolute Maximum Ratings(Note)If Military/Aerospace specified devices are required,pleasecontacttheNationalSemiconductorSalesOffice/Distributors for availability and specifications.Supply Voltage7VInput Voltage7VOperating Free Air Temperature RangeDM54LS and 54LSb55C toa125CDM74LS0C toa70CStorage Temperature Rangeb65C toa150CNote:The Absolute Maximum Ratings are those valuesbeyond which the safety of the device cannot be guaran-teed.The device should not be operated at these limits.Theparametric values defined in the Electrical Characteristicstable are not guaranteed at the absolute maximum ratings.The Recommended Operating Conditions table will definethe conditions for actual device operation.Recommended Operating ConditionsSymbolParameterDM54LS155DM74LS155UnitsMinNomMaxMinNomMaxVCCSupply Voltage4.555.54.7555.25VVIHHigh Level Input Voltage22VVILLow Level Input Voltage0.70.8VVOHHigh Level Output Currentb0.4b0.4mAIOLLow Level Output Current48mATAFree Air Operating Temperatureb55125070CLS155 Electrical Characteristicsover recommended operating free air temperature range(unless otherwise noted)SymbolParameterConditionsMinTypMaxUnits(Note 1)VIInput Clamp VoltageVCCeMin,IIe b18 mAb1.5VVOHHigh Level OutputVCCeMin,IOHeMaxDM542.53.4VVoltageVILeMax,VIHeMinDM742.73.4VOLLow Level OutputVCCeMin,IOLeMaxDM540.250.4VoltageVILeMax,VIHeMinDM740.350.5VIOLe4 mA,VCCeMinDM740.250.4IIInput CurrentMaxVCCeMax,VIe7V0.1mAInput VoltageIIHHigh Level Input CurrentVCCeMax,VIe2.7V20mAIILLow Level Input CurrentVCCeMax,VIe0.4Vb0.36mAIOSShort CircuitVCCeMaxDM54b20b100mAOutput Current(Note 2)DM74b20b100ICCSupply CurrentVCCeMax(Note 3)6.110mANote 1:All typicals are at VCCe5V,TAe25C.Note 2:Not more than one output should be shorted at a time,and the duration should not exceed one second.Note 3:ICCis measured with all outputs open,A,B,and C1 inputs at 4.5V,and C2,G1,and G2 inputs grounded.2LS155 Switching Characteristicsat VCCe5V and TAe25C(See Section 1 for Test Waveforms and Output Load)From(Input)RLe2 kXSymbolParameterTo(Output)CLe15 pFCLe50 pFUnitsMinMaxMinMaxtPLHPropagation Delay TimeA,B,C2,G11822nsLow to High Level Outputor G2 to YtPHLPropagation Delay TimeA,B,C2,G12735nsHigh to Low Level Outputor G2 to YtPLHPropagation Delay TimeA or B1824nsLow to High Level Outputto YtPHLPropagation Delay TimeA or B2735nsHigh to Low Level Outputto YtPLHPropagation Delay TimeC12024nsLow to High Level Outputto YtPHLPropagation Delay TimeC12735nsHigh to Low Level Outputto YRecommended Operating ConditionsSymbolParameterDM54LS156DM74LS156UnitsMinNomMaxMinNomMaxVCCSupply Voltage4.555.54.7555.25VVIHHigh Level Input Voltage22VVILLow Level Input Voltage0.70.8VVOHHigh Level Output Voltage5.55.5VIOLLow Level Output Current48mATAFree Air Operating Temperatureb55125070CLS156 Electrical Characteristicsover recommended operating free air temperature range(unless otherwise noted)SymbolParameterConditionsMinTypMaxUnits(Note 1)VIInput Clamp VoltageVCCeMin,IIe b18 mAb1.5VICEXHigh Level OutputVCCeMin,VOe5.5V100mACurrentVILeMax,VIHeMinVOLLow Level OutputVCCeMin,IOLeMaxDM540.250.4VoltageVILeMax,VIHeMinDM740.350.5VIOLe4 mA,VCCeMinDM740.250.4IIInput CurrentMaxVCCeMax,VIe7V0.1mAInput VoltageIIHHigh Level Input CurrentVCCeMax,VIe2.7V20mAIILLow Level Input CurrentVCCeMax,VIe0.4Vb0.36mAICCSupply CurrentVCCeMax(Note 2)6.110mANote 1:All typicals are at VCCe5V,TAe25C.Note 2:ICCis measured with all outputs open,A,B,and C1 inputs at 4.5V,and C2,G1,and G2 grounded.3LS156 Switching Characteristicsat VCCe5V and TAe25C(See Section 1 for Test Waveforms and Output Load)From(Input)RLe2 kXSymbolParameterTo(Output)CLe15 pFCLe50 pFUnitsMinMaxMinMaxtPLHPropagation Delay TimeA,B,C2,G12853nsLow to High Level Outputor G2 to YtPHLPropagation Delay TimeA,B,C2,G13343nsHigh to Low Level Outputor G2 to YtPLHPropagation Delay TimeA or B2853nsLow to High Level Outputto YtPHLPropagation Delay TimeA or B3343nsHigh to Low Level Outputto YtPLHPropagation Delay TimeC12853nsLow to High Level Outputto YtPHLPropagation Delay TimeC13443nsHigh to Low Level Outputto YLogic DiagramTL/F/6395245Physical Dimensionsinches(millimeters)Ceramic Leadless Chip Carrier(E)Order Number 54LS155LMQBNS Package Number E20A16-Lead Ceramic Dual-In-Line Package(J)Order Number 54LS155DMQB,54LS156DMQB,DM54LS155J or DM54LS156JNS Package Number J16A6Physical Dimensionsinches(millimeters)(Continued)16-Lead Small Outline Molded Package(M)Order Number DM74LS155M or DM74LS156MNS Package Number M16A16-Lead Molded Dual-In-Line Package(N)Order Number DM74LS155N or DM74LS156NNS Package Number N16E754LS155/DM54LS155/DM74LS155,54LS156/DM54LS156/DM74LS156 Dual 2-Line to 4-Line Decoders/DemultiplexersPhysical Dimensionsinches(millimeters)(Continued)16-Lead Ceramic Flat Package(W)Order Number 54LS155FMQB,54LS156FMQB,DM54LS155W or DM54LS156WNS Package Number W16ALIFE SUPPORT POLICYNATIONALS PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORTDEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONALSEMICONDUCTOR CORPORATION.As used herein:1.Lifesupportdevicesorsystemsaredevicesor2.A critical component is any component of a lifesystems which,(a)are intended for surgical implantsupport device or system whose failure to perform caninto the body,or(b)support or sustain life,and whosebe reasonably expected to cause the failure of the lifefailure to perform,when properly used in accordancesupport device or system,or to affect its safety orwith instructions for use provided in the labeling,caneffectiveness.be reasonably expected to result in a significant injuryto the user.National SemiconductorNational SemiconductorNational SemiconductorNational SemiconductorCorporationEuropeHong Kong Ltd.Japan Ltd.1111 West Bardin RoadFax:(a49)0-180-530 85 8613th Floor,Straight Block,Tel:[phone]Arlington,TX 76017Email:Ocean Centre,5 Canton Rd.Fax:[phone]Tel:[phone]Deutsch Tel:(a49)0-180-530 85 85Tsimshatsui,KowloonFax:1(800)737-7018EnglishTel:(a49)0-180-532 78 32Hong KongFran3ais Tel:(a49)0-180-532 93 58Tel:[phone]ItalianoTel:(a49)0-180-534 16 80Fax:[phone]National does not assume any responsibility for use of any circuitry described,no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.