怎样读芯片数据手册

HowtoReadaDatasheetEEmail:[e-mail]•thetypicaldeviceperformance•minimumandmaximumrequirementsandcharacteristics•whatyoucandotothedevicewithoutharmingit•suggestedusesandhintsManufacturerswantyou,thedesigner,tohaveasuccessfulexperiencewiththeirdevice.Theyaretryingtobehelpful.Theydon’talwayssucceed.Thedatasheetonthefollowingpagesisarelativelygooddatasheet.Ittriestoconciselytellyoueverythingyouneedtoknowaboutthedevice,acommon555timerchip(theduct-tapeoftheelectronicshobbyist).MostdatasheetsforICsfollowthesamegenerallayout.Youdon’thavetounderstandeverythinginadatasheet.There’salotofinformationthatmightnotbeofanyusetoyou.Theannotationsthatfollowtrytopointoutpartsofthedatasheetthatyoushouldpayparticularattentionto.Wheredoyoufinddatasheets?Nowadaysyoucanfindalmostanydatasheetontheinternet,ofteninPDF(Acrobat)form.Forexample,theLM555datasheetfromNationalSemiconductorisontheirwebsiteat(SeeforexampletheCD4538timerchip.)WIMS5/6/02,D.GroverPICdatasheetdatasheetzzzzdatasheetdatasheet555ICdatasheetdatasheetdatasheetdatasheetInternetdatasheetpdfNationalSemiconductorLM555datasheet˚CnNormallyonandnormallyoffoutputnAvailablein8-pinMSOPpackageApplicationsnPrecisiontimingnPulsegenerationnSequentialtimingnTimedelaygenerationnPulsewidthmodulationnPulsepositionmodulationnLinearrampgeneratorSchematicDiagramDS007851-1February2000LM555Timer©2000NationalSemiconductorCorporationDS007851˚CnNormallyonandnormallyoffoutputnAvailablein8-pinMSOPpackageApplicationsnPrecisiontimingnPulsegenerationnSequentialtimingnTimedelaygenerationnPulsewidthmodulationnPulsepositionmodulationnLinearrampgeneratorSchematicDiagramDS007851-1February2000LM555Timer©2000NationalSemiconductorCorporationDS007851(Note2)IfMilitary/Aerospacespecifieddevicesarerequired,pleasecontacttheNationalSemiconductorSalesOffice/Distributorsforavailabilityandspecifications.SupplyVoltage+18VPowerDissipation(Note3)LM555CM,LM555CN1180mWLM555CMM613mWOperatingTemperatureRangesLM555C0˚Cto+70˚CStorageTem