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NEC555

时间:2021-04-23 00:45:37 来源:网络整理编辑:NEC555

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74HC14isHexInvertingSchmittTriggerIC.74HC14isamemberofthe74XXXXIntegratedCircuitSeries,consistingoflogicgates.ThismoduleisalsoreferredtoasthehexadecimalSchmitttrigger.ItcanbeusedinsixseparateSchmitttriggerinputinverterswithstandardpush-pulloutputs.Thisblogprovidesyouwithabasicoverviewofthe74HC14HexInvertingSchmittTriggerIC,includingitspindescriptions,functionsandspecifications,equivalentproducts,etc.,tohelpyouquicklyunderstandwhat74HC14is.Wewillbegladtofindthatthisblogcanbeusefulforpeoplelovingelectroniccomponents:)ABriefIntroductionto74HC14ICCatalog74HC14Pinout74HC14Feature74HC14EquivalentWheretoUse74HC14HowtoUse74HC1474HC14SwitchingTime74HC14Application74HC14PackageComponentDatasheet74HC14PinoutRefertothe74HC14Pinoutandchoosetheappropriatepackagedependingonyourrequirement.Herearedescriptionsforeachpin.PinNumberDescriptionINPUTOFINVERTINGSCHMITTTRIGGERGATE11A-INPUTofGATE132A-INPUTofGATE253A-INPUTofGATE394A-INPUTofGATE4115A-INPUTofGATE5136A-INPUTofGATE6SHAREDTERMINALS7GND-Connectedtoground14VCC-ConnectedtopositivevoltagetoprovidepowertoallsixgatesOUTPUTOFINVERTINGSCHMITTTRIGGERGATE21Y-OUTPUTofGATE142Y-OUTPUTofGATE263Y-OUTPUTofGATE384Y-OUTPUTofGATE4105Y-OUTPUTofGATE5126Y-OUTPUTofGATE674HC14FeaturesSupplyvoltagerange:-0.5Vto+7.0VMaximumcurrentallowedtodrawthrougheachgateoutput:25mAMaximumtotalcurrentallowedthroughVCCorGNDpin:50mATotallyleadfreeTTLoutputsHighnoiseimmunityMaximumESD:2KVTypicalRiseTime:85-625ns(dependingonsupplyvoltage)TypicalFallTime:85-625ns(dependingonsupplyvoltage)Operatingtemperature:-55Cto125C74HC14EquivalentMC14584,CD40106,eachop-ampcanbeconfiguredtofunctionastheSchmitttriggergate.WheretoUse74HC1474HC14ICTounderstandtheuseof74HC14,consider:Case1:Whereyouwanttoconvertthewaveformsignaltothesquarewave.Schmitttriggergatesin74HC14cancovernon-squarewaveformswithsquarewaves.WiththeSchmitttriggergate,wecanconvertthesinusoidalortriangularwaveintoasquarewave.Case2:Ifyouwantalogicinverter.InverterSchmitttriggersinthischipcanprovideoutputthatisanegatedlogicinput.Thesechipgatescanbeusedtogetinvertedlogicsforcontrollersordigitalelectronics.Case3:Toeliminatenoiseindigitalelectronics.Indigitalelectronics,noisecausesmajorerrorswhenusingthe74HC14chipisideal.Theuseof74HC14isfurtherpromotedwithmultiplegatesandfastoutput.HowtoUse74HC14Asmentionedabove,74HC14hassixINVERTINGSCHMITTTRIGGERGATESwhichcanbeusedassixindividualgates.Thesimplifiedinternalstructurecanbedescribedasfollows.Now,inordertounderstandtheuseofthegate,letuschooseasinglegateandconnectthepowertothechip.Alsoprovideananalogsignaltotheinput.Asshowninthecircuit,wearegivingasinusoidalwaveattheinputandtakingVoutasthegateoutput.Oncewedrawtheinputandoutputgraph,weregoingtohavesomethinglikethis.TheSchmittTriggeroperatingprincipleisreallysimple,theInvertingSchmittTriggeroutputwillbeLOWonlywhentheinputsignalvoltagelevelcrossesitsthresholdvoltage(+Vt).Asshowninthefigure,theoutputvoltage(Vin)isHIGHuptothepointwheretheinputvoltage(Vin)reachestheoutputvoltage(Vt+).Oncethethresholdvoltageisreached,theoutputvoltageislower.Outputvoltageremainslowuntiltheinputvoltagedropstolowthresholdvoltage(Vt-).Oncethatpointhasbeenreached,theoutputvoltageisagainHIGH.Thiscycleisgoingon.Asshowninthegraph,wecanseewhenthesinusoidalsignalisgivenasaninputtothesquarewaveoutput.Wecanuseeverygatelikethistogetthedesiredoutput.74HC14SwitchingTimeThegatesin74HC14takesometimetoprovideoutputtotheinput.Thistimedelayiscalledswitchingtimes.Eachgatewilltaketimetoturnitonandoff.Letusconsidertheswitchingdiagramofthegatetounderstandthisbetter.Therearetwodelaysthathappenwhenyouswitch.ThetwoparametersareRISETIME(tPHL)andFALLTIME(tPLH).Inthegraph,VoHgoesLOWwhenINPUTreachesthethresholdandVoHgoesHIGHwhenINPUTgoesbelowthethresholdvoltage.Itstheoutputvoltageinanothersense.Asyoucanseeinthegraph,thereisadelayintimebetweenLOGICINPUTgoingHIGHandVoHgoingLOW.ThisdelayinrespondingiscalledRISETIME(tPHL).TheRISETIME(tPHL)numberis95ns.Similarly,thereisatimedelayinthegraphbetweenLOGICINPUTgoingLOWandVoHgoingHIGHattheOUTPUT.ThisdelayintheresponseiscalledFALLTIME(tPLH).Thefaltimer(tPLH)is95ns.Totalforeachcycleis192ns.Thesedelaysmustbeconsideredathigherfrequencies,otherwisetherewillbemajorerrors.Therewillalsobefalsetriggersandnoisebeyondoperatingfrequencies.74HC14ApplicationGeneralpurposelogicPCsandnotebooksTV,DVD,SetTopBoxNetworkingDigitalsystems74HC14PackageThatsallforourintroductiontothe74HC14IC.Ifyoufindthisbloguseful,pleasebookmarkourwebsiteApogeeweb,wewillprovideyouwithelectroniccomponentblogs,industrynews,tools,etc.thatyouareinterestedin.StaytunedforournextblogComponentDatasheet74HC14Datasheet

74HC14isHexInvertingSchmittTriggerIC.74HC14isamemberofthe74XXXXIntegratedCircuitSeries,consistingoflogicgates.ThismoduleisalsoreferredtoasthehexadecimalSchmitttrigger.ItcanbeusedinsixseparateSchmitttriggerinputinverterswithstandardpush-pulloutputs.Thisblogprovidesyouwithabasicoverviewofthe74HC14HexInvertingSchmittTriggerIC,includingitspindescriptions,functionsandspecifications,equivalentproducts,etc.,tohelpyouquicklyunderstandwhat74HC14is.Wewillbegladtofindthatthisblogcanbeusefulforpeoplelovingelectroniccomponents:)ABriefIntroductionto74HC14ICCatalog74HC14Pinout74HC14Feature74HC14EquivalentWheretoUse74HC14HowtoUse74HC1474HC14SwitchingTime74HC14Application74HC14PackageComponentDatasheet74HC14PinoutRefertothe74HC14Pinoutandchoosetheappropriatepackagedependingonyourrequirement.Herearedescriptionsforeachpin.PinNumberDescriptionINPUTOFINVERTINGSCHMITTTRIGGERGATE11A-INPUTofGATE132A-INPUTofGATE253A-INPUTofGATE394A-INPUTofGATE4115A-INPUTofGATE5136A-INPUTofGATE6SHAREDTERMINALS7GND-Connectedtoground14VCC-ConnectedtopositivevoltagetoprovidepowertoallsixgatesOUTPUTOFINVERTINGSCHMITTTRIGGERGATE21Y-OUTPUTofGATE142Y-OUTPUTofGATE263Y-OUTPUTofGATE384Y-OUTPUTofGATE4105Y-OUTPUTofGATE5126Y-OUTPUTofGATE674HC14FeaturesSupplyvoltagerange:-0.5Vto+7.0VMaximumcurrentallowedtodrawthrougheachgateoutput:25mAMaximumtotalcurrentallowedthroughVCCorGNDpin:50mATotallyleadfreeTTLoutputsHighnoiseimmunityMaximumESD:2KVTypicalRiseTime:85-625ns(dependingonsupplyvoltage)TypicalFallTime:85-625ns(dependingonsupplyvoltage)Operatingtemperature:-55Cto125C74HC14EquivalentMC14584,CD40106,eachop-ampcanbeconfiguredtofunctionastheSchmitttriggergate.WheretoUse74HC1474HC14ICTounderstandtheuseof74HC14,consider:Case1:Whereyouwanttoconvertthewaveformsignaltothesquarewave.Schmitttriggergatesin74HC14cancovernon-squarewaveformswithsquarewaves.WiththeSchmitttriggergate,wecanconvertthesinusoidalortriangularwaveintoasquarewave.Case2:Ifyouwantalogicinverter.InverterSchmitttriggersinthischipcanprovideoutputthatisanegatedlogicinput.Thesechipgatescanbeusedtogetinvertedlogicsforcontrollersordigitalelectronics.Case3:Toeliminatenoiseindigitalelectronics.Indigitalelectronics,noisecausesmajorerrorswhenusingthe74HC14chipisideal.Theuseof74HC14isfurtherpromotedwithmultiplegatesandfastoutput.HowtoUse74HC14Asmentionedabove,74HC14hassixINVERTINGSCHMITTTRIGGERGATESwhichcanbeusedassixindividualgates.Thesimplifiedinternalstructurecanbedescribedasfollows.Now,inordertounderstandtheuseofthegate,letuschooseasinglegateandconnectthepowertothechip.Alsoprovideananalogsignaltotheinput.Asshowninthecircuit,wearegivingasinusoidalwaveattheinputandtakingVoutasthegateoutput.Oncewedrawtheinputandoutputgraph,weregoingtohavesomethinglikethis.TheSchmittTriggeroperatingprincipleisreallysimple,theInvertingSchmittTriggeroutputwillbeLOWonlywhentheinputsignalvoltagelevelcrossesitsthresholdvoltage(+Vt).Asshowninthefigure,theoutputvoltage(Vin)isHIGHuptothepointwheretheinputvoltage(Vin)reachestheoutputvoltage(Vt+).Oncethethresholdvoltageisreached,theoutputvoltageislower.Outputvoltageremainslowuntiltheinputvoltagedropstolowthresholdvoltage(Vt-).Oncethatpointhasbeenreached,theoutputvoltageisagainHIGH.Thiscycleisgoingon.Asshowninthegraph,wecanseewhenthesinusoidalsignalisgivenasaninputtothesquarewaveoutput.Wecanuseeverygatelikethistogetthedesiredoutput.74HC14SwitchingTimeThegatesin74HC14takesometimetoprovideoutputtotheinput.Thistimedelayiscalledswitchingtimes.Eachgatewilltaketimetoturnitonandoff.Letusconsidertheswitchingdiagramofthegatetounderstandthisbetter.Therearetwodelaysthathappenwhenyouswitch.ThetwoparametersareRISETIME(tPHL)andFALLTIME(tPLH).Inthegraph,VoHgoesLOWwhenINPUTreachesthethresholdandVoHgoesHIGHwhenINPUTgoesbelowthethresholdvoltage.Itstheoutputvoltageinanothersense.Asyoucanseeinthegraph,thereisadelayintimebetweenLOGICINPUTgoingHIGHandVoHgoingLOW.ThisdelayinrespondingiscalledRISETIME(tPHL).TheRISETIME(tPHL)numberis95ns.Similarly,thereisatimedelayinthegraphbetweenLOGICINPUTgoingLOWandVoHgoingHIGHattheOUTPUT.ThisdelayintheresponseiscalledFALLTIME(tPLH).Thefaltimer(tPLH)is95ns.Totalforeachcycleis192ns.Thesedelaysmustbeconsideredathigherfrequencies,otherwisetherewillbemajorerrors.Therewillalsobefalsetriggersandnoisebeyondoperatingfrequencies.74HC14ApplicationGeneralpurposelogicPCsandnotebooksTV,DVD,SetTopBoxNetworkingDigitalsystems74HC14PackageThatsallforourintroductiontothe74HC14IC.Ifyoufindthisbloguseful,pleasebookmarkourwebsiteApogeeweb,wewillprovideyouwithelectroniccomponentblogs,industrynews,tools,etc.thatyouareinterestedin.StaytunedforournextblogComponentDatasheet74HC14Datasheet

For example in audio preamplifier stages it provides good gain to very weak audio signals.where and how to use in a circuit and how to safely use in electronic circuit.

NEC555

Besides audio circuits it can be used to amplify variety of low gain signals.a darlington transistor is a pair of combined two BJT transistor connected with each other in a wiring called darlington pair in a single package for obtaining high gain and to switch ON higher current on very small base current.therefore it can be used to amplify low gain current signals to high gain.

NEC555

connect its pins correctly in the circuit and also do not connect load more than 1. Applications:Sensor CircuitsAudio PreamplifiersAudio Amplifier StagesSwitching Loads under 1.

NEC555

2AMax Collector-Emitter Voltage (VCE): 30VMax Collector-Base Voltage (VCB): 40VMax Emitter-Base Voltage (VEBO): 10VMax Collector Dissipation (Pc): 625 miliWattMax Transition Frequency (fT): 200 MHzMinimum Maximum DC Current Gain (hFE): 30000Max Storage Operating temperature Should Be: -55 to +150 CentigradePNP Complementary:PNP Complementary of BC517 is BC516 Replacement and Equivalent:MPSW45A.

hobby and commercial electronic circuits.by this procedure the user can adjust the gain between 20 to 200.

7BypassThis pin is used to connect the decoupling capacitor to groundLM386 Description: LM386 is a widely used audio amplifier IC manufactured in 8 pin dipLM311 is a voltage comparator op amp IC with many good features; in this article we will discuss LM311 pinout.

Offset Balance CapabilityStrobe functionalityLM311 Pin Configuration: Pin#Pin NamePin Description 1GroundGround / Negative Supply Pin 2Non Inverting Input Non Inverting Input of the IC.3Inverting InputInverting Input of the ICs 4VEEVoltage at Common Emitter 5BalanceThis pin should be used to get rid of offset voltage 6Balance / StrobeOutput stage can be controlled with this pin.