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1、NA555,NE555,SA555,SE555www.ti.comSLFS022H–SEPTEMBER1973–REVISEDJUNE2010PRECISIONTIMERSCheckforSamples:NA555,NE555,SA555,SE5551FEATURES•TimingFromMicrosecondstoHours•AdjustableDutyCycle•AstableorMonostableOperation•TTL-CompatibleOutputCanSinkorSourceupto200mANA555...DORPPACKAGESE555...FKPACKAGEN
2、E555...D,P,PS,ORPWPACKAGE(TOPVIEW)SA555...DORPPACKAGESE555...D,JG,ORPPACKAGE(TOPVIEW)CCNCGNDNCVNCGND18V3212019CCNC418NCTRIG27DISCHDISCHTRIG517OUT36THRESNCNC616RESET45CONTTHRESOUT715NC814NC910111213NCNCNCCONTRESETNC–NointernalconnectionDESCRIPTION/ORDERINGINFORMATIONThesedevicesareprecisiontimin
3、gcircuitscapableofproducingaccuratetimedelaysoroscillation.Inthetime-delayormonostablemodeofoperation,thetimedintervaliscontrolledbyasingleexternalresistorandcapacitornetwork.Intheastablemodeofoperation,thefrequencyanddutycyclecanbecontrolledindependentlywithtwoexternalresistorsandasingleextern
4、alcapacitor.Thethresholdandtriggerlevelsnormallyaretwo-thirdsandone-third,respectively,ofVCC.Theselevelscanbealteredbyuseofthecontrol-voltageterminal.Whenthetriggerinputfallsbelowthetriggerlevel,theflip-flopisset,andtheoutputgoeshigh.Ifthetriggerinputisabovethetriggerlevelandthethresholdinputis
5、abovethethresholdlevel,theflip-flopisresetandtheoutputislow.Thereset(RESET)inputcanoverrideallotherinputsandcanbeusedtoinitiateanewtimingcycle.WhenRESETgoeslow,theflip-flopisreset,andtheoutputgoeslow.Whentheoutputislow,alow-impedancepathisprovidedbetweendischarge(DISCH)andground.Theoutputcircui
6、tiscapableofsinkingorsourcingcurrentupto200mA.Operationisspecifiedforsuppliesof5Vto15V.Witha5-Vsupply,outputlevelsarecompatiblewithTTLinputs.1Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddisclaime
7、rstheretoappearsattheendofthisdatasheet.PRODUCTIONDATAinformationiscurrentasofpublicationdate.Copyright©1973–2010,TexasInstrumentsIncorporatedProductsconformtospecificationsperthetermsoftheTexasOnproductscomplianttoMIL-PRF-38535,a
