电子技术-芯片资料-74LS158.pdf

TL/F/639654LS157/DM54LS157/DM74LS157,54LS158/DM54LS158/DM74LS158Quad 2-Line to 1-Line Data Selectors/MultiplexersJune 198954LS157/DM54LS157/DM74LS157,54LS158/DM54LS158/DM74LS158Quad 2-Line to 1-Line Data Selectors/MultiplexersGeneral DescriptionThese data selectors/multiplexers contain inverters anddrivers to supply full on-chip data selection to the four out-put gates.A separate strobe input is provided.A 4-bit wordis selected from one of two sources and is routed to the fouroutputs.The LS157 presents true data whereas the LS158presents inverted data to minimize propagation delay time.ApplicationsYExpand any data input pointYMultiplex dual data busesYGenerate four functions of two variables(one variableis common)YSource programmable countersFeaturesYBuffered inputs and outputsYTypical Propagation TimeLS1579 nsLS1587 nsYTypical Power DissipationLS15749 mWLS15824 mWYAlternateMilitary/Aerospacedevice(54LS157,54LS158)is available.Contact a National Semiconduc-tor Sales Office/Distributor for specifications.Connection DiagramsDual-In-Line PackageTL/F/63961Order Number 54LS157DMQB,54LS157FMQB,54LS157LMQB,DM54LS157J,DM54LS157W,DM74LS157M or DM74LS157NSee NS Package Number E20A,J16A,M16A,N16E or W16ADual-In-Line PackageTL/F/63962Order Number 54LS158DMQB,54LS158FMQB,54LS158LMQB,DM54LS158J,DM54LS158W,DM74LS158M or DM74LS158NSee NS Package Number E20A,J16A,M16A,N16E or W16AFunction TableInputsOutput YStrobeSelectABLS157LS158HXXXLHLLLXLHLLHXHLLHXLLHLHXHHLHeHigh 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 ConditionsSymbolParameterDM54LS157DM74LS157UnitsMinNomMaxMinNomMaxVCCSupply Voltage4.555.54.7555.25VVIHHigh Level Input Voltage22VVILLow Level Input Voltage0.70.8VIOHHigh Level Output Currentb0.4b0.4mAIOLLow Level Output Current48mATAFree Air Operating Temperatureb55125070CLS157 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 CurrentMaxVCCeMaxS or G0.2mAInput VoltageVIe7VA or B0.1IIHHigh Level InputVCCeMaxS or G40mACurrentVIe2.7VA or B20IILLow Level InputVCCeMaxS or Gb0.8mACurrentVIe0.4VA or Bb0.4IOSShort CircuitVCCeMaxDM54b20b100mAOutput Current(Note 2)DM74b20b100ICCSupply CurrentVCCeMax(Note 3)9.716mANote 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 4.5V applied to all inputs and all outputs open.2LS157 Switching Characteristicsat VCCe5V and TAe25C(See Section 1 for Test Waveforms and Output Load)From(Input)RLe2 kXSymbolParameterTo(Output)CLe15 pFCLe50 pFUnitsMinMaxMinMaxtPLHPropagation Delay TimeData1418nsLow to High Level Outputto YtPHLPropagation Delay TimeData1423nsHigh to Low Level Outputto YtPLHPropagation Delay TimeStrobe2024nsLow to High Level Outputto YtPHLPropagation Delay TimeStrobe2130nsHigh to Low Level Outputto YtPLHPropagation Delay TimeSelect2328nsLow to High Level Outputto YtPHLPropagation Delay TimeSelect2732nsHigh to Low Level Outputto YRecommended Operating ConditionsSymbolParameterDM54LS158DM74LS158UnitsMinNomMaxMinNomMaxVCCSupply Voltage4.555.54.7555.25VVIHHigh Level Input Voltage22VVILLow Level Input Voltage0.70.8VIOHHigh Level Output Currentb0.4b0.4mAIOLLow Level Output Current48mATAFree Air Operating Temperatureb55125070CLS158 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 CurrentMaxVCCeMaxS or G0.2mAInput VoltageVIe7VA or B0.1IIHHigh Level InputVCCeMaxS or G40mACurrentVIe2.7VA or B20IILLow Level InputVCCeMaxS or Gb0.8mACurrentVIe0.4VA or Bb0.4IOSShort CircuitVCCeMaxDM54b20b100mAOutput Current(Note 2)DM74b20b100ICCSupply CurrentVCCeMax(Note 3)4.88mANote 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 4.5V applied to all inputs and all outputs open.3LS158 Switching Characteristicsat VCCe5V and TAe25C(See Section 1 for Test Waveforms and Output Load)From(Input)RLe2 kXSymbolParameterTo(Output)CLe15 pFCLe50 pFUnitsMinMaxMinMaxtPLHPropagation Delay TimeData1218nsLow to High Level Outputto YtPHLPropagation Delay TimeData1221nsHigh to Low Level Outputto YtPLHPropagation Delay TimeStrobe1723nsLow to High Level Outputto YtPHLPropagation Delay TimeStrobe1828nsHigh to Low Level Outputto YtPLHPropagation Delay TimeSelect2024nsLow to High Level Outputto YtPHLPropagation Delay TimeSelect2436nsHigh to Low Level Outputto YLogic DiagramsLS157TL/F/63963LS158TL/F/6396445Physical Dimensionsinches(millimeters)Ceramic Leadless Chip Carrier Package(E)Order Number 54LS157LMQB or 54LS158LMQBNS Package Number E20A16-Lead Ceramic Dual-In-Line Package(J)Order Number 54LS157DMQB,54LS158DMQB,DM54LS157J or DM54LS158JNS Package Number J16A6Physical Dimensionsinches(millimeters)(Continued)16-Lead Small Outline Molded Package(M)Order Number DM74LS157M or DM74LS158MNS Package Number M16A16-Lead Molded Dual-In-Line Package(N)Order Number DM74LS157N or DM74LS158NNS Package Number N16E754LS157/DM54LS157/DM74LS157,54LS158/DM54LS158/DM74LS158Quad 2-Line to 1-Line Data Selectors/MultiplexersPhysical Dimensionsinches(millimeters)(Continued)16-Lead Ceramic Flat Package(W)Order Number 54LS157FMQB,54LS158FMQB,DM54LS157W or DM54LS158WNS 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.