Logic OR Gate Tutorial

... OR Gate and the Logic OR Gate Truth Table used in Digital TTL and CMOS Logic Gate circuits. ... Commonly available digital logic OR gate IC's include:. X Registertodownloadpremiumcontent! Registertodownloadpremiumcontent! X Deutsch Polski Register LogIn ACCircuits Amplifiers Attenuators BinaryNumbers BooleanAlgebra Capacitors CombinationalLogic Connectivity Counters DCCircuits Diodes Electromagnetism Filters Inductors Input/OutputDevices LogicGates MiscellaneousCircuits OperationalAmplifiers Oscillator PowerElectronics PowerSupplies Premium RCNetworks Resistors Resources SequentialLogic Systems Transformers Transistors Uncategorized WaveformGenerators PremiumContent FurtherEducation Sitemap ContactUs Home / LogicGates / LogicORGateTutorial LogicORGateTutorial TheLogicORGateisatypeofdigitallogiccircuitwhoseoutputgoesHIGHtoalogiclevel1onlywhenoneormoreofitsinputsareHIGH Theoutput,Qofa“LogicORGate”onlyreturns“LOW”againwhenALLofitsinputsareatalogiclevel“0”.InotherwordsforalogicORgate,any“HIGH”inputwillgivea“HIGH”,logiclevel“1”output. ThelogicorBooleanexpressiongivenforadigitallogicORgateisthatforLogicalAdditionwhichisdenotedbyaplussign,( + )givingustheBooleanexpressionof:  A+B = Q. ThusalogicORgatecanbecorrectlydescribedasan“InclusiveORgate”becausetheoutputistruewhenbothofitsinputsaretrue(HIGH).Thenwecandefinetheoperationofa2-inputlogicORgateasbeing:   “IfeitherAorBistrue,thenQistrue” 2-inputTransistorORGate Asimple2-inputinclusiveORgatecanbeconstructedusingRTLResistor-transistorswitchesconnectedtogetherasshownbelowwiththeinputsconnecteddirectlytothetransistorbases.Eithertransistormustbesaturated“ON”foranoutputatQ.   LogicORGatesareavailableusingdigitalcircuitstoproducethedesiredlogicalfunctionandisgivenasymbolwhoseshaperepresentsthelogicaloperationoftheORgate. DigitalLogic“OR”GateTypes The2-inputLogicORGate Symbol TruthTable 2-inputORGate B A Q 0 0 0 0 1 1 1 0 1 1 1 1 BooleanExpressionQ = A+B ReadasAORBgivesQ The3-inputLogicORGate Symbol TruthTable 3-inputORGate C B A Q 0 0 0 0 0 0 1 1 0 1 0 1 0 1 1 1 1 0 0 1 1 0 1 1 1 1 0 1 1 1 1 1 BooleanExpressionQ = A+B+C ReadasAORBORCgivesQ LiketheANDgate,theORfunctioncanhaveanynumberofindividualinputs.However,commercialavailableORgatesareavailablein2,3,or4inputstypes.Additionalinputswillrequiregatestobecascadedtogetherforexample. Multi-inputORGate   TheBooleanExpressionforthis6-inputORgatewillthereforebe: Q = (A+B)+(C+D)+(E+F) Inotherwords: AORBORCORDOREORFgivesQ Ifthenumberofinputsrequiredisanoddnumberofinputsany“unused”inputscanbeheldLOWbyconnectingthemdirectlytogroundusingsuitable“Pull-down”resistors. CommonlyavailabledigitallogicORgateIC’sinclude: TTLLogicORGates 74LS32Quad2-input CMOSLogicORGates CD4071Quad2-input CD4075Triple3-input CD4072Dual4-input 7432Quad2-inputLogicORGate InthenexttutorialaboutDigitalLogicGates,wewilllookatthedigitallogicNOTGatefunctionasusedinbothTTLandCMOSlogiccircuitsaswellasitsBooleanAlgebradefinitionandtruthtable. PreviousLogicANDGateTutorial NextLogicNOTGateTutorial ReadmoreTutorialsinLogicGates 1.DigitalLogicGates 2.LogicANDGateTutorial 3.LogicORGateTutorial 4.LogicNOTGateTutorial 5.LogicNANDGateTutorial 6.LogicNORGateTutorial 7.Exclusive-ORGateTutorial 8.Exclusive-NORGateTutorial 9.DigitalBufferTutorial 10.DigitalLogicGatesSummary 11.Pull-upResistors 12.UniversalLogicGates 67Comments JointheconversationCancelreplyError!Pleasefillallfields. Notifymeoffollow-upcommentsbyemail. Δ Lucky IamclearedwiththecalculatingaspectoftheORgate PostedonMarch06th2022|10:59pm Reply Amosmulongo It’sgoodtoparticipate PostedonFebruary06th2022|8:26am Reply TukaramChavan Okk PostedonOctober28th2021|6:21am Reply TukaramChavan Goodlern PostedonOctober28th2021|6:19am Reply EshaEraj Nice PostedonAugust15th2021|12:31pm Reply AliyuUmar LikephysicsbutIdon’tknowhowtocalculateitandIlikethispage Yourgoodthingstous PostedonJuly27th2021|10:44pm Reply Imtiyaz GreattutorialonORGate. PostedonJune30th2021|6:37am Reply Ibukun Whatof5inputlogicORgate PostedonFebruary24th2022|11:34am Reply Y.Swetha CmoslogicgateinverterusingORgate PostedonJune24th2021|11:46am Reply RampraveshAnisha WhatistheIRgate PostedonMarch02nd2021|4:09am Reply MuhammadMuzammal 3TransistorORGATE 2TransistorANDGATE PostedonFebruary10th2021|10:06am Reply Vikashkumar Nice PostedonJanuary23rd2021|1:25pm Reply Harshad Explainalllogicsgateswiththreeinputs PostedonOctober27th2020|2:02pm Reply Pavankumar Super PostedonSeptember09th2020|8:15am Reply Norshah Good,itrefreshmymemoryaboutthis PostedonJuly09th2020|5:01am Reply Anjudhakar Neetstudent PostedonJuly02nd2020|4:53pm Reply RohitJoshi Thanks PostedonJune06th2020|6:50am Reply Sanusibashir Ineedtutorial PostedonMay28th2020|9:27am Reply Pelumi Thankssomuch Itreallyhelped PostedonApril19th2020|12:22pm Reply RUPESHRaj Goodmorning PostedonMarch18th2020|1:43am Reply AustinOkonkwo Thanksamgrateful PostedonJanuary29th2020|11:35pm Reply ViewMore ReadmoreTutorialsinLogicGates 1.DigitalLogicGates 2.LogicANDGateTutorial 3.LogicORGateTutorial 4.LogicNOTGateTutorial 5.LogicNANDGateTutorial 6.LogicNORGateTutorial 7.Exclusive-ORGateTutorial 8.Exclusive-NORGateTutorial 9.DigitalBufferTutorial 10.DigitalLogicGatesSummary 11.Pull-upResistors 12.UniversalLogicGates LookingforDataSheets? Close TheBasics ContactUs PrivacyPolicy TermsofUse ForAdvertisers ContactSales MediaGuideRequest AspencoreNetwork EDN EETimes EEWeb ElectronicProducts PowerElectronicsNews EPSNews Embedded PlanetAnalog ElectroSchematics TechOnline Datasheets.com ElectronicsKnowHow IoTTimes GlobalNetwork EETimesAsia EETimesChina EETimesIndia EETimesJapan EETimesTaiwan EDNAsia EDNChina EDNTaiwan EDNJapan ESMChina ConnectwithUs Facebook AllcontentsareCopyright©2022byAspenCore,Inc.Allrightsreserved. Weusecookiesonourwebsitetogiveyouthemostrelevantexperiencebyrememberingyourpreferencesandrepeatvisits.Byclicking“AcceptAll”,youconsenttotheuseofALLthecookies.However,youmayvisit"CookieSettings"toprovideacontrolledconsent.CookieSettingsAcceptAllManageconsent Close PrivacyOverview Thiswebsiteusescookiestoimproveyourexperiencewhileyounavigatethroughthewebsite.Outofthese,thecookiesthatarecategorizedasnecessaryarestoredonyourbrowserastheyareessentialfortheworkingofbasicfunctionalitiesofthewebsite.Wealsousethird-partycookiesthathelpusanalyzeandunderstandhowyouusethiswebsite.Thesecookieswillbestoredinyourbrowseronlywithyourconsent.Youalsohavetheoptiontoopt-outofthesecookies.Butoptingoutofsomeofthesecookiesmayaffectyourbrowsingexperience. Necessary Necessary AlwaysEnabled Necessarycookiesareabsolutelyessentialforthewebsitetofunctionproperly.Thesecookiesensurebasicfunctionalitiesandsecurityfeaturesofthewebsite,anonymously. CookieDurationDescriptioncookielawinfo-checkbox-analytics11monthsThiscookieissetbyGDPRCookieConsentplugin.Thecookieisusedtostoretheuserconsentforthecookiesinthecategory"Analytics".cookielawinfo-checkbox-functional11monthsThecookieissetbyGDPRcookieconsenttorecordtheuserconsentforthecookiesinthecategory"Functional".cookielawinfo-checkbox-necessary11monthsThiscookieissetbyGDPRCookieConsentplugin.Thecookiesisusedtostoretheuserconsentforthecookiesinthecategory"Necessary".cookielawinfo-checkbox-others11monthsThiscookieissetbyGDPRCookieConsentplugin.Thecookieisusedtostoretheuserconsentforthecookiesinthecategory"Other.cookielawinfo-checkbox-performance11monthsThiscookieissetbyGDPRCookieConsentplugin.Thecookieisusedtostoretheuserconsentforthecookiesinthecategory"Performance".viewed_cookie_policy11monthsThecookieissetbytheGDPRCookieConsentpluginandisusedtostorewhetherornotuserhasconsentedtotheuseofcookies.Itdoesnotstoreanypersonaldata. Functional Functional Functionalcookieshelptoperformcertainfunctionalitieslikesharingthecontentofthewebsiteonsocialmediaplatforms,collectfeedbacks,andotherthird-partyfeatures. Performance Performance Performancecookiesareusedtounderstandandanalyzethekeyperformanceindexesofthewebsitewhichhelpsindeliveringabetteruserexperienceforthevisitors. Analytics Analytics Analyticalcookiesareusedtounderstandhowvisitorsinteractwiththewebsite.Thesecookieshelpprovideinformationonmetricsthenumberofvisitors,bouncerate,trafficsource,etc. Advertisement Advertisement Advertisementcookiesareusedtoprovidevisitorswithrelevantadsandmarketingcampaigns.Thesecookiestrackvisitorsacrosswebsitesandcollectinformationtoprovidecustomizedads. Others Others Otheruncategorizedcookiesarethosethatarebeinganalyzedandhavenotbeenclassifiedintoacategoryasyet. SAVE&ACCEPT