单片机相关资料74系列芯片总汇74ls157

1、C1995 National Semiconductor Corporation TL/F/6396RRD-B30M105/Printed in U. S. A.54LS157/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/MultiplexersG

2、eneral DescriptionFeaturesThese data selectors/multiplexers contain inverters andY Buffered inputs and outputs drivers to supply full on-chip data selection to the four out-Y Typical Propagation Time put gates. A separate strobe input is provided. A 4-bit wordLS157 9 nsis selected from one of two so

3、urces and is routed to the fourLS158 7 nsoutputs. The LS157 presents true data whereas the LS158Y Typical Power Dissipation presents inverted data to minimize propagation delay time.LS157 49 mWLS158 24 mWApplicationsY AlternateMilitary/Aerospacedevice(54LS157,Y Expand any data input point54LS158) is

4、 available. Contact a National Semiconduc-Y Multiplex dualdata busestor Sales Office/Distributor for specifications.Y Generate four functions of two variables (one variable is common)Y Source programmable countersConnection DiagramsDual-In-Line PackageDual-In-Line PackageTL/F/6396 1TL/F/6396 2Order

5、Number 54LS157DMQB, 54LS157FMQB,Order Number 54LS158DMQB, 54LS158FMQB, 54LS157LMQB, DM54LS157J, DM54LS157W,54LS158LMQB, DM54LS158J, DM54LS158W, DM74LS157M or DM74LS157NDM74LS158M or DM74LS158NSee NS Package Number E20A, J16A,See NS Package Number E20A, J16A, M16A, N16E or W16AM16A, N16E or W16AFunct

6、ion TableH e High Level, L e Low Level, X e Dont CareInputsOutput YStrobeSelectABLS157LS158H L L L LX L L H HXXLXHXXLXHL L H L HH H L H L2Absolute Maximum Ratings (Note)If Military/Aerospace specified devices are required,Note: The Absolute Maximum Ratings are those values please contact the Nationa

7、l Semiconductor Salesbeyond which the safety of the device cannot be guaran- Office/Distributors for availability and specifications.teed. The device should not be operated at these limits. The Supply Voltage7Vparametric values defined in the Electrical CharacteristicsInput Voltage7Vtable are not gu

8、aranteed at the absolute maximum ratings.Operating Free Air Temperature RangeThe Recommended Operating Conditions table will definethe conditions for actual device operation.DM54LS and 54LSb55?C to a125?C DM74LS0?C to a70?CStorage Temperature Rangeb65?C to a150?CRecommended Operating ConditionsLS157

9、 Electrical Characteristicsover recommended operating free air temperature range (unless otherwise noted)Note 1: All typicals are at VCC e 5V, TA e 25?C.Note 2: Not more than one output should be shorted at a time, and the duration should not exceed one second. Note 3: ICC is measured with 4.5V appl

10、ied to all inputs and all outputs open.SymbolParameterConditionsMinTyp (Note 1)MaxUnitsVIInput Clamp VoltageVCC e Min, II e b18 mAb1.5VVOHHigh Level Output VoltageVCC e Min, IOH e Max VIL e Max, VIH e MinDM542.53.4VDM742.73.4VOLLow Level Output VoltageVCC e Min, IOL e Max VIL e Max, VIH e MinDM540.2

11、50.4VDM740.350.5IOL e 4 mA, VCC e MinDM740.250.4IIInput Current Max Input VoltageVCC eMax VI e 7VS or G0.2mAA orB0.1IIHHigh Level Input CurrentVCC eMax VI e 2.7VS or G40mAA orB20IILLow Level Input CurrentVCC eMax VI e 0.4VS orGb0.8mAA orBb0.4IOSShort Circuit Output CurrentVCC eMax (Note 2)DM54b20b10

12、0mADM74b20b100ICCSupply CurrentVCC e Max (Note 3)9.716mASymbolParameterDM54LS157DM74LS157UnitsMinNomMaxMinNomMaxVCCSupply Voltage4.555.54.7555.25VVIHHigh Level Input Voltage22VVILLow Level Input Voltage0.70.8VIOHHigh Level Output Currentb0.4b0.4mAIOLLow Level Output Current48mATAFree Air Operating T

13、emperatureb55125070?C3LS157 Switching Characteristicsat VCC e 5V and TA e 25?C (See Section 1 for Test Waveforms and Output Load)Recommended Operating ConditionsLS158 Electrical Characteristicsover recommended operating free air temperature range (unless otherwise noted)Note 1: All typicals are at V

14、CC e 5V, TA e 25?C.Note 2: Not more than one output should be shorted at a time, and the duration should not exceed one second. Note 3: ICC is measured with 4.5V applied to all inputs and all outputs open.SymbolParameterConditionsMinTyp (Note 1)MaxUnitsVIInput Clamp VoltageVCC e Min, II e b18 mAb1.5

15、VVOHHigh Level Output VoltageVCC e Min, IOH e Max VIL e Max, VIH e MinDM542.53.4VDM742.73.4VOLLow Level Output VoltageVCC e Min, IOL e Max VIL e Max, VIH e MinDM540.250.4VDM740.350.5IOL e 4 mA, VCC e MinDM740.250.4IIInput Current Max Input VoltageVCC eMax VI e 7VS or G0.2mAA orB0.1IIHHigh Level Inpu

16、t CurrentVCC eMax VI e 2.7VS or G40mAA orB20IILLow Level Input CurrentVCC eMax VI e 0.4VS orGb0.8mAA orBb0.4IOSShort Circuit Output CurrentVCC eMax (Note 2)DM54b20b100mADM74b20b100ICCSupply CurrentVCC e Max (Note 3)4.88mASymbolParameterDM54LS158DM74LS158UnitsMinNomMaxMinNomMaxVCCSupply Voltage4.555.

17、54.7555.25VVIHHigh Level Input Voltage22VVILLow Level Input Voltage0.70.8VIOHHigh Level Output Currentb0.4b0.4mAIOLLow Level Output Current48mATAFree Air Operating Temperatureb55125070?CSymbolParameterFrom (Input) To (Output)RL e 2 kXUnitsCL e 15 pFCL e 50 pFMinMaxMinMaxtPLHPropagation Delay Time Lo

18、w to High Level OutputData to Y1418nstPHLPropagation Delay Time High to Low Level OutputData to Y1423nstPLHPropagation Delay Time Low to High Level OutputStrobe to Y2024nstPHLPropagation Delay Time High to Low Level OutputStrobe to Y2130nstPLHPropagation Delay Time Low to High Level OutputSelect to

19、Y2328nstPHLPropagation Delay Time High to Low Level OutputSelect to Y2732ns4LS158 Switching Characteristicsat VCC e 5V and TA e 25?C (See Section 1 for Test Waveforms and Output Load)Logic DiagramsLS157LS158TL/F/6396 3TL/F/6396 4SymbolParameterFrom (Input) To (Output)RL e 2 kXUnitsCL e 15 pFCL e 50

20、pFMinMaxMinMaxtPLHPropagation Delay Time Low to High Level OutputData to Y1218nstPHLPropagation Delay Time High to Low Level OutputData to Y1221nstPLHPropagation Delay Time Low to High Level OutputStrobe to Y1723nstPHLPropagation Delay Time High to Low Level OutputStrobe to Y1828nstPLHPropagation De

21、lay Time Low to High Level OutputSelect to Y2024nstPHLPropagation Delay Time High to Low Level OutputSelect to Y2436ns56Physical Dimensions inches (millimeters)Ceramic Leadless Chip Carrier Package (E) Order Number 54LS157LMQB or 54LS158LMQB NS Package Number E20A16-Lead Ceramic Dual-In-Line Package

22、(J)Order Number 54LS157DMQB, 54LS158DMQB, DM54LS157J or DM54LS158JNS Package Number J16A7Physical Dimensions inches (millimeters) (Continued)16-Lead Small Outline Molded Package (M) Order Number DM74LS157M or DM74LS158M NS Package Number M16A16-Lead Molded Dual-In-Line Package (N) Order Number DM74L

23、S157N or DM74LS158N NS Package Number N16ENational 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.54LS157/DM54LS157/DM74LS157,54LS158/

24、DM54LS158/DM74LS158Quad 2-Line to 1-Line Data Selectors/MultiplexersPhysical Dimensions inches (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 US

25、E AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:1. Life support devices or systems are devices or 2. A critical component is any component of a life systems which, (a) are intended for surgical implant support device or system whose failure to perform can into the body, or (b) support or sustain life, and whose be reasonably e