数电第三章逻辑门(logic gatas)原版英文教材辅助课件

CH3LOGICGATES1.Logicaloperation2.Application3.Troubleshootingoflogicgates4.WaveformsChapteroverview1.Thestandardlogicsymbol3-1TheInverterDistinctiveshapesymbolsRectangularoutlinesymbolsThenegationindicatorsThepolarityindicators2.TruthtableInputsoutputsAX01103.Operation4.Timingdiagram5.Logicexpression:6.Applicationexample:1’scomplementcircuit1.ThestandardlogicsymbolABX3-2TheAndGateDistinctiveshape＆XABRectangularoutline3.ANDOperationIfinputsAandBareHIGH,outputXisHIGH;IfeitherAorBisLOW,orifbothAandBareLOW,XisLOW4.TruthtableInputsoutputsABX000010100111Table3-2Truthtablefora2-inputANDgate3.PulsedOperationOmission(P105,e.g.3-3)ABXX=ABOr4.LogicexpressionΒΑXBooleanmultiplication0100000011115.ApplicationexampleTheANDGateasanEnable/InhibitDeviceFig.3-15p1081.Thestandardlogicsymbol3-3TheORGate≥1XABRectangularoutlineXABDistinctiveshapesymbol2.LogicalOperationifeitherinputAorBisHIGH,outputXisHIGHifbothAandBareHIGH;XisHIGHifbothAandBareLOW,Xislow.3.TruthtableInputsoutputsABX0000111011114.PulsedOperationABX5.LogicexpressionX=A+B110000101111BooleanadditionisthesameastheORfunction4.ApplicationexampleFig.3-24IntrusiondetectionandalarmsystemTheNANDisauniversalgate,ItcanbeusedincombinationtoperformtheAND,OR,andinverteroperations.3-4TheNANDGate1.ThestandardlogicsymbolRectangularoutlinesymbol＆XABXABDistinctiveshapesymbol1.Thestandardlogicsymbol2.LogicalOperation3.Truthtable4.PulsedOperation5.Logicexpression(Omisssion)3-5TheNORGate3-6TheEXCLUSIVE-ORandEXCLUSIVE-NORGates=1XABXABThestandardlogicsymbol1.CMOS:ComplementaryMetal-OxideSemiconductorWidelyusedinVLSI,ULSI3-7IntegratedcircuitlogicgatesCMOSandTTLarethemostwidelyusedICtechnologies,ECLisusedinmorespecializedapplications400074HC74HCT74VHC74VHCT速度慢与TTL不兼容抗干扰功耗低74LVC74AUC速度加快与TTL兼容负载能力强抗干扰功耗低速度两倍于74HC与TTL兼容负载能力强抗干扰功耗低低(超低)电压速度更加快与TTL兼容负载能力强抗干扰功耗低2.TTL:Transistor-TransistorLogicUsedinMSI,LSI74LSseries74series74ASseries74ALSseries3-7Performancecharacteristicsandparameters输出高电平+VDDVOH(min)VOL(max)0G1门vO范围vO输出低电平输入高电平VIH(min)VIL(max)+VDD0G2门vI范围输入低电平vIvOvI驱动门G1负载门G2113-8Troubleshooting3-9Digitalsystemapplication