CD74AC138

September 1998

3-to-8-Line Decoders/Demultiplexers

DescriptionTheCD74AC138,CD74ACT138,CD74AC238,andCD74ACT238are3-to-8-linedecoders/demultiplexersthatutilizetheHarrisAdvancedCMOSLogictechnology.Bothcircuitshavethreebinaryselectinputs(A0,A1,andA2).Ifthedeviceisenabled,theseinputsdeterminewhichoneoftheeightnormallyHIGHoutputsoftheAC/ACT138willgoLOWorwhichonofthenormallyLOWoutputsoftheAC/ACT238willgoHIGH.TwoactiveLOWandoneactiveHIGHenables(E1,E2andE3)areprovidedtosimplifythecascading of these devices.Features•CD74AC138, CD74ACT138 . . . . . . . . . . . . . . .Inverting•CD74AC238, CD74ACT238 . . . . . . . . . . .Non-Inverting•Buffered Inputs•Typical Propagation Delay-5ns at VCC = 5V, TA = 25oC, CL = 50pF[ /Title(CD74AC138,CD74ACT138,CD74AC238,CD74ACT238)/Sub-ject (3-to-8-LineDecod-ers/Demulti-plex-ers)/Author ()/Key-words(Har-risSemi-con-ductor,Advanced•Exceeds 2kV ESD Protection MIL-STD-883, Method3015•SCR-Latchup-Resistant CMOS Process and CircuitDesign•Speed of Bipolar FAST™/AS/S with SignificantlyReduced Power Consumption•Balanced Propagation Delays•AC Types Feature 1.5V to 5.5V Operation andBalanced Noise Immunity at 30% of the Supply•±24mA Output Drive Current-Fanout to 15 FAST™ ICs-Drives 50Ω Transmission LinesOrdering InformationPARTNUMBERCD74AC138ECD74ACT138ECD74AC238ECD74ACT238ECD74AC138MCD74ACT138MCD74AC238MCD74ACT238MTEMP.RANGE (oC)PACKAGEPKG.NO.E16.3E16.3E16.3E16.3M16.15M16.15M16.15M16.150 to 70oC, -40 to 85,16 Ld PDIP-55 to 1250 to 70oC, -40 to 85,16 Ld PDIP-55 to 1250 to 70oC, -40 to 85,16 Ld PDIP-55 to 1250 to 70oC, -40 to 85,16 Ld PDIP-55 to 1250 to 70oC, -40 to 85,16 Ld SOIC-55 to 1250 to 70oC, -40 to 85,16 Ld SOIC-55 to 1250 to 70oC, -40 to 85,16 Ld SOIC-55 to 1250 to 70oC, -40 to 85,16 Ld SOIC-55 to 125PinoutCD74AC138, CD74ACT138, CD74AC238, CD74ACT238(PDIP, SOIC)TOP VIEWA01A12A23E14E25E36AC/ACT138Y77AC/ACT238 Y7GND816VCCY0 AC/ACT13815Y0 AC/ACT23814Y1 AC/ACT138Y1 AC/ACT23813Y2 AC/ACT138Y2 AC/ACT23812Y3 AC/ACT138Y3 AC/ACT23811Y4 AC/ACT138Y4 AC/ACT23810Y5 AC/ACT138Y5 AC/ACT23Y6 AC/ACT138Y6 AC/ACT238NOTES:17.Whenordering,usetheentirepartnumber.Addthesuffix96toobtain the variant in the tape and reel.18.Waferanddieforthispartnumberisavailablewhichmeetsallelec-tricalspecifications.PleasecontactyourlocalsalesofficeorHarriscustomer service for ordering information.CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.FAST™ is a Trademark of Fairchild Semiconductor.Copyright © Harris Corporation 1998

File Number

1909.1

1

CD74AC138, CD74ACT138, CD74AC238, CD74ACT238Functional DiagramAC/ACTAC/ACT238138A0A1A212315141312456111097Y0Y1Y2Y3Y4Y5Y6Y7Y0Y1Y2Y3Y4Y5Y6Y7E1E2E3CD74AC/ACT138 TRUTH TABLEINPUTSENABLEE3XLHHHHHHHH(NOTE 4)E0HXLLLLLLLLA2XXLLLLHHHHADDRESSA1XXLLHHLLHHA0XXLHLHLLLHY0HHLHHHHHHHY1HHHLHHHHHHY2HHHHLHHHHHOUTPUTSY3HHHHHLHHHHY4HHHHHHLHHHY5HHHHHHHLHHY6HHHHHHHHLHY7HHHHHHHHHLCD74AC/ACT238 TRUTH TABLEINPUTSENABLEE3XLHHHHHHHHNOTES:19.H = High Level, L = Low Level, X = Don’t Care20.E0 =E1 +E2(NOTE 4)E0HXLLLLLLLLA2XXLLLLHHHHADDRESSA1XXLLHHLLHHA0XXLHLHLHLHY0LLHLLLLLLLY1LLLHLLLLLLY2LLLLHLLLLLOUTPUTSY3LLLLLHLLLLY4LLLLLLHLLLY5LLLLLLLHLLY6LLLLLLLLHLY7LLLLLLLLLH2

CD74AC138, CD74ACT138, CD74AC238, CD74ACT238Absolute Maximum RatingsDC Supply Voltage, VCC. . . . . . . . . . . . . . . . . . . . . . . .-0.5V to 6VDC Input Diode Current, IIKFor VI < -0.5V or VI > VCC + 0.5V. . . . . . . . . . . . . . . . . . . . . .±20mADC Output Diode Current, IOKFor VO < -0.5V or VO > VCC + 0.5V . . . . . . . . . . . . . . . . . . . .±50mADC Output Source or Sink Current per Output Pin, IOFor VO > -0.5V or VO < VCC + 0.5V . . . . . . . . . . . . . . . . . . . .±50mADC VCC or Ground Current, ICC orIGND (Note 5) . . . . . . . . .±100mAThermal InformationThermal Resistance (Typical, Note 7)θJA (oC/W)PDIP Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . .90SOIC Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . .160Maximum Junction Temperature (Plastic Package) . . . . . . . . . .150oCMaximum Storage Temperature Range . . . . . . . . . .-65oC to 150oCMaximum Lead Temperature (Soldering 10s). . . . . . . . . . . . .300oCOperating ConditionsTemperature Range, TA . . . . . . . . . . . . . . . . . . . . . .-55oC to 125oCSupply Voltage Range, VCC (Note 6)AC Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.5V to 5.5VACT Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.5V to 5.5VDC Input or Output Voltage, VI, VO . . . . . . . . . . . . . . . . .0V to VCCInput Rise and Fall Slew Rate, dt/dvAC Types, 1.5V to 3V . . . . . . . . . . . . . . . . . . . . . . . . .50ns (Max)AC Types, 3.6V to 5.5V. . . . . . . . . . . . . . . . . . . . . . . .20ns (Max)ACT Types, 4.5V to 5.5V. . . . . . . . . . . . . . . . . . . . . . .10ns (Max)CAUTION:Stressesabovethoselistedin“AbsoluteMaximumRatings”maycausepermanentdamagetothedevice.Thisisastressonlyratingandoperationof the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.NOTES:21.For up to 4 outputs per device, add±25mA for each additional output.22.Unless otherwise specified, all voltages are referenced to ground.23.θJA is measured with the component mounted on an evaluation PC board in free air.DC Electrical SpecificationsTESTCONDITIONSPARAMETERAC TYPESHigh Level Input VoltageVIH--1.535.5Low Level Input VoltageVIL--1.535.5High Level Output VoltageVOHVIH or VIL-0.05-0.05-0.05-4-24-75(Note 8, 9)-50(Note 8, 9)1.534.534.55.55.51.22.13.85---1.42.94.42.583.94-----0.30.91.65-------1.22.13.85---1.42.94.42.483.83.85----0.30.91.65-------1.22.13.85---1.42.94.42.43.7-3.85---0.30.91.65-------VVVVVVVVVVVVVSYMBOLVI(V)IO(mA)VCC(V)25oCMINMAX-40oC TO85oCMINMAX-55oC TO125oCMINMAXUNITS3

CD74AC138, CD74ACT138, CD74AC238, CD74ACT238DC Electrical Specifications (Continued)TESTCONDITIONSPARAMETERLow Level Output VoltageSYMBOLVOLVI(V)VIH or VILIO(mA)0.050.050.05122475(Note 8, 9)50(Note 8, 9)Input Leakage CurrentQuiescent Supply CurrentMSIACT TYPESHigh Level Input VoltageLow Level Input VoltageHigh Level Output VoltageVIHVILVOH--VIH or VIL---0.05-24-75(Note 8, 9)-50(Note 8, 9)Low Level Output VoltageVOLVIH or VIL0.052475(Note 8, 9)50(Note 8, 9)Input Leakage CurrentQuiescent Supply CurrentMSIAdditionalSupplyCurrentperInput Pin TTL Inputs High1 Unit LoadNOTES:24.Testoneoutputatatimefora1-secondmaximumduration.Measurementismadebyforcingcurrentandmeasuringvoltagetominimizepower dissipation.25.Test verifies a minimum 50Ω transmission-line-drive capability at 85oC, 75Ω at 125oC.IIICC∆ICCVCC orGNDVCC orGNDVCC-2.1-0-4.5 to5..5 to5...55.55...55.55.55.55..5 to5.52-4.43.94----------0.8----0.10.36--±0.182.42-4.43.83.85---------0.8----0.10.441.65-±1802.82-4.43.7-3.85--------0.8----0.10.5-1.65±11603VVVVVVVVVVµAµAmAIIICCVCC orGNDVCC orGND-025oCMIN---------MAX0.10.10.10.360.36--±0.18-40oC TO85oCMIN---------MAX0.10.10.10.440.441.65-±180-55oC TO125oCMIN---------MAX0.10.10.10.50.5-1.65±1160UNITSVVVVVVVµAµAVCC(V)1.534.534.55.55.55.55.5ACT Input Load TableINPUTA0-A2E1,E2E3UNIT LOAD0.8310.42NOTE:Unitloadis∆ICClimitspecifiedinDCElectricalSpecificationsTable, e.g., 2.4mA max at 25oC.4

CD74AC138, CD74ACT138, CD74AC238, CD74ACT238Switching SpecificationsInput tr, tf = 3ns, CL= 50pF (Worst Case)-40oC TO 85oCPARAMETERAC TYPESPropagation Delay,An to Output(CD74AC/ACT138)tPLH, tPHL1.53.3(Note 11)5(Note 12)Propagation Delay,E1,E2 to Output(CD74AC/ACT138)tPLH, tPHL1.53.35Propagation Delay,E3 to Output(CD74AC/ACT138)tPLH, tPHL1.53.35Propagation Delay,An to Output(CD74AC/ACT238)tPLH, tPHL1.53.35Propagation Delay,E1,E2 to Output(CD74AC/ACT238)tPLH, tPHL1.53.35Propagation Delay,E3 to Output(CD74AC/ACT238)tPLH, tPHL1.53.35Input CapacitancePower Dissipation CapacitanceACT TYPESPropagation Delay,An to Output(CD74AC/ACT138)Propagation Delay,E1,E2 to Output(CD74AC/ACT138)Propagation Delay,E3 to Output(CD74AC/ACT138)Propagation Delay,An to Output(CD74AC/ACT238)Propagation Delay,E1,E2 to Output(CD74AC/ACT238)tPLH, tPHL5(Note 12)53.1-10.93-12nsCICPD(Note 13)---42.8-3.62.6-42.8-5.43.9-4.33.1-.3---------------------110125141011412.79.1125141017019.113.613515.210.7121.115.110--3.92.8-3.52.5-3.92.8-5.33.8-4.23-5.84.2---------------------11013815.411125141013815.411187211514916.711.920823.216.610-nsnsnsnsnsnsnsnsnsnsnsnsnsnsnsnsnsnspFpFSYMBOL VCC (V)MINTYPMAX-55oC TO 125oCMINTYPMAXUNITStPLH, tPHL2.7-9.52.6-10.5nstPLH, tPHL52.8-102.8-11nstPLH, tPHL-14.23.9-15.6nstPLH, tPHL53.7-12.93.6-14.2ns5

CD74AC138, CD74ACT138, CD74AC238, CD74ACT238Switching SpecificationsInput tr, tf = 3ns, CL= 50pF (Worst Case)PARAMETERPropagation Delay,E3 to Output(CD74AC/ACT238)Input CapacitancePower Dissipation CapacitanceNOTES:26.Limits tested at 100%.27.3.3V Min at 3.6V, Max at 3V.28.5V Min at 5.5V, Max at 4.5V.29.CPD is used to determine the dynamic power consumption per package.AC: PD = VCC2 fi(CPD + CL)ACT: PD = VCC2 fi(CPD + CL) + VCC∆ICC where fi = input frequency, CL = output load capacitance, VCC = supply voltage.SYMBOLtPLH, tPHL VCC (V)5MIN3.5 (Continued)-55oC TO 125oCMAX12.4MIN3.4TYP-MAX13.6UNITSns-40oC TO 85oCTYP-CICPD(Note 13)-----11010----11010-pFpFtr = 3nsINPUTtf = 3ns90%VS10%GNDE3tr = 3nsE1,E2INPUTtf = 3ns90%VSGND138 OUTPUTVStPHLtPLHVStPHL138 OUTPUTtPHLtPLHVSVS238 OUTPUTtPLH238 OUTPUTtPLHtPHLFIGURE 8.PROPAGATION DELAY TIMESFIGURE 9.PROPAGATION DELAY TIMESOUTPUTRL (NOTE)500ΩDUTOUTPUTLOADCL50pFNOTE:For AC Series Only: When VCC = 1.5V, RL = 1kΩ.CD74ACInput LevelInput Switching Voltage, VSOutput Switching Voltage, VSVCC0.5 VCC0.5 VCCCD74ACT3V1.5V0.5 VCCFIGURE 10.PROPAGATION DELAY TIMES6

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