ANSI IEEE Std 991-1986 Logic Circuit Diagrams

ANSI/IEEEStd991-1986AnAmericanNationalStandardIEEEStandardforLogicCircuitDiagramsSponsorIEEEStandardsCoordinatingCommittee11,GraphicSymbolsandDesignationsApprovedMarch21,1985IEEEStandardsBoardApprovedApril25,1985AmericanNationalStandardsInstitute©Copyright1986byTheInstituteofElectricalandElectronicsEngineers,Inc345East47thStreet,NewYork,NY10017,USANopartofthispublicationmaybereproducedinanyform,inanelectronicretrievalsystemorotherwise,withoutthepriorwrittenpermissionofthepublisher.AcceptanceNoticeThisnon-Governmentdocumentwasadoptedon5June,1986,andisapprovedforusebytheDoD.Theindicatedindustrygrouphasfurnishedtheclearancesrequiredbyexistingregulations.CopiesofthedocumentarestockedbyDoDSingleStockPoints,USNavalPublicationsandFormsCenter,Philadelphia,PA19120,forissuetoDoDactivitiesonly.ContractorsandindustrygroupsmustobtaincopiesdirectlyfromIEEE,345East47thStreet,NewYork,NY10017.NOTICE:WhenreafÞrmation,amendment,revision,orcancellationofthisstandardsisinitiallyproposed,theindustrygroupresponsibleforthisstandardshallinformthemilitarycoordinatingactivityoftheproposedchangeandrequestparticipation.TitleofDocument:IEEEStandardforLogicCircuitDiagramsDocumentNo:ANSI/IEEEStd991-1986DateofSpecificIssueAdopted:27June,1986ReleasingIndustryGroup:TheInstituteofElectricalandElectronicsEngineers,Inc.Custodians:MilitaryCoordinationActivity:Army--ARAmry--ARNavy--SHProjectDRPR-0260AirForce--13ReviewActivities:Army--AV,MI,AM,CR,ERNavy--OS,ASAirForce--11,15,17UserActivities:Army--ATNavy--MCiiiIEEEStandardsdocumentsaredevelopedwithintheTechnicalCommitteesoftheIEEESocietiesandtheStandardsCoordinatingCommitteesoftheIEEEStandardsBoard.Membersofthecommitteesservevoluntarilyandwithoutcompensation.TheyarenotnecessarilymembersoftheInstitute.ThestandardsdevelopedwithinIEEErepresentaconsensusofthebroadexpertiseonthesubjectwithintheInstituteaswellasthoseactivitiesoutsideofIEEEwhichhaveexpressedaninterestinparticipatinginthedevelopmentofthestandard.UseofanIEEEStandardiswhollyvoluntary.TheexistenceofanIEEEStandarddoesnotimplythattherearenootherwaystoproduce,test,measure,purchase,market,orprovideothergoodsandservicesrelatedtothescopeoftheIEEEStandard.Furthermore,theviewpointexpressedatthetimeastandardisapprovedandissuedissubjecttochangebroughtaboutthroughdevelopmentsinthestateoftheartandcommentsreceivedfromusersofthestandard.EveryIEEEStandardissubjectedtoreviewatleastonceeveryÞveyearsforrevisionorreafÞrmation.WhenadocumentismorethanÞveyearsold,andhasnotbeenreafÞrmed,itisreasonabletoconcludethatitscontents,althoughstillofsomevalue,donotwhollyreßectthepresentstateoftheart.UsersarecautionedtochecktodeterminethattheyhavethelatesteditionofanyIEEEStandard.CommentsforrevisionofIEEEStandardsarewelcomefromanyinterestedparty,regardlessofmembershipafÞliationwithIEEE.Suggestionsforchangesindocumentsshouldbeintheformofaproposedchangeoftext,togetherwithappropriatesupportingcomments.Interpretations:OccasionallyquestionsmayariseregardingthemeaningofportionsofstandardsastheyrelatetospeciÞcapplications.WhentheneedforinterpretationsisbroughttotheattentionofIEEE,theInstitutewillinitiateactiontoprepareappropriateresponses.SinceIEEEStandardsrepresentconsensusofallconcernedinterests,itisimportanttoensurethatanyinterpretationhasalsoreceivedtheconcurrenceofabalanceofinterests.ForthisreasonIEEEandthemembersofitstechnicalcommitteesarenotabletoprovideaninstantresponsetointerpretationrequestsexceptinthosecaseswherethematterhaspreviouslyreceivedformalconsideration.Commentsonstandardsandrequestsforinterpretationsshouldbeaddressedto:Secretary,IEEEStandardsBoard345East47thStreetNewYork,NY10017USAivForeword(ThisForewordisnotapartofANSI/IEEEStd991-1986,IEEEStandardforLogicCircuitDiagrams.)Thecontributorstothisstandardrepresentabroadrangeofinstitutions,technologies,anddocumentationneeds.Theyincludeindustrial,governmental,andeducationalorganizations,producersandconsumersofdevicesandequipment,usersandnonusersofcomputer-aideddesignanddrafting,andarangeofaestheticpreferences.ThataconsensusofsuchdiverseinterestscouldbeachievedinproducingthisstandardisindicativeofaneedforacommonpracticeinthisÞeld.Workonthisstandardstartedin1972,inanad-hocworkinggrouponLogicDiagrams,underthepreparinggroupforY14.15,ElectricalDiagrams.WorkwassuspendedforseveralyearswhiletheInternationalElectrotechnicalCommission,TechnicalCommittee3developedPublication117,Part7.towhichtheUnitedStatescontributed.In1982anewsubcommitteewasformed,operatingaspartoftheIEEEStandardsCoordinatingCommitteeforGraphicSymbolsandDesignations,SCC11.Itdecidedtoprepareanewdraftincorporating:1)The1975draftoftheoriginalworkinggroup,2)IECPublication113,Part7.insofaraspractical(inthepresentstandard,somepartsandillustrationsareverysimilartotheIECdocument;differencesandadditionsresultfromnewdevelopmentsinsymbolsforlogicfunctionsandnewperceptionsofcurrentneeds),and3)SuchpartsofANSIY14.15-1968(R1973)asappliedtologiccircuitdiagrams,butwithupdatingtoremoveduplicationofrequirementsfoundinreferencedstandardsandtoapplythematerialexplicitlytologiccircu