标签: 施密
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施密特设计CMOSSchmittTrigger―AUniquelyVersatileDesignComponentCMOSSchmittTrigger―AUniquelyVersatileDesignComponentINTRODUCTIONTheSchmitttriggerhasfoundmanyapplicationsinnumerouscircuits,bothanaloganddigital.TheversatilityofaTTLSchmittishamperedbyitsnarrowsupplyrange,limitedinterfacecapability,lowinputimpedanceandunbalancedoutputcharacteristics.TheSchmitttriggercouldbebuiltfromdiscretedevicestosatisfyaparticularparameter,butthisisacarefulandsometimestime-consumingdesign.TheCMOSSchmitttrigger,whichcomessixtoapackage,usesCMOScharacteristicstooptimizedesignandadvanceintoareaswhereTTLcouldnotgo.Theseareasinclude:interfacingwithopampsandtransmissionlines,whichoperatefromlargesplitsupplies,l……
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施密特触发器详解Tri-StateLogicandSchmittTriggersUniversityofConnecticut1Tri-StateLogicnnnThreeStates:High,Low,HighZ(highimpedance,ordisabled)Tri-stategatesmaybeconstructedusingtransmissiongates,orbyinternalmodificationsto2-stategates.Tri-stategatesarerequiredforbus-basedarchitectures:PPIAROMn-bitdatabusRAMRAMRAMManydevicesareconnectedinparallelonthebus,butonlyonedevicecanattempttodrivethebusatonetime.UniversityofConnecticut2Tri-StateTTLNAND2GateVCCENABLE=HIGH.RPRBRCQPAQIBENABLEDSDIADIBDENQSDOOUTENABLE=LOW.QORDIfthecontrolinputisinverted,itiscalledan“INHIBIT”input.UniversityofConnecticut3Tri-StateCMOSGateVDDENABLE=HIGH.MPIMPEMNIMPOINMNOOU……
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