标签: 串行eeprom

1K-16KMicrowire串行EEPROM……

24LC04B24LC08B2.5伏串行eeprom(中文资料)……

4K位串行EEPROM的CPU监控器X4043_x4045……

Embeddedapplicationsincreasinglywantmoreintegrationandpower,inlessspaceforlesscost.UsinglowpowerSerialEEPROMs(SEE)forapplicationfirmware,lookuptables,andmicrocodecoupledwithsmallfootprintsmakesforpermanentstorageatrespectablesavings.Oneadditionalmethodofsavingonthepowerbudgetisselectivelypoweringoffcomponentswhennotneeded,abasicforembeddedpowermanagement.Thelow-powerSEEsofferedbyMicrochipTechnologyInc.,offeranadditionalbenefit,poweringtheSEEfromamicrocontrollerport.ThisallowsthehostcontrollertonotonlymanipulatetheSerialEEPROMReadsandWrite,butalsotheperiodswhenitispoweredofforon.Satellitecommunicationsusethistechniquetosavepowerandtotaldoseaccumulation.WecallthistechniquePOWERPORT.ThemicrocontrollerportmusthavesufficientIoh(sourcecurrent)tosustainthevoltageandcurrentforallmemoryfunctions,READ,ERASE,andWRITE.Obviously,notallmemoryorperipheraldevicescouldbepoweredthusly,butMicrochip’sSEEdeviceswillfunctioninthisenvironment.AN535LogicPoweredSerialEEPROMsAuthore:RichardJ.FisherParameterConditionsMicrochipTechnologyInc.BruceNegleyICCSTANDBYNotinanactiveoperationwhileMicrochipTechnolgyInc.VCCissupplied.ICCREADThepartisinaREADoperation.EmbeddedapplicationsincreasinglywantmoreICCPEAKTheBYTE/PAGEWRITEandintegrationandpower,inlessspaceforlesscost.UsingWRITEERAS……

Formanyyears,the8-leadSOICpackagehasbeenthemostpopularpackageforserialEEPROMs,butnowsmallerpackagesarebecomingmoreandmorecommonplace.Thisoffersanumberofbenefits;thereductionsinfootprintsizeandcomponentheightaresomeofthemoreobviousones.Smallerpackagesalsogenerallyofferacostadvantageovertheirlargercounterparts.Currently,theSOT-23packageisoneofthesmallestpackagesavailableforserialEEPROMs,anditspopu-larityhasbeengrowingsignificantly.However,whiletheSOICisanindustry-standardpackageavailablefromallmajorEEPROMvendors,theSOT-23packageisstillrelativelynew,especiallyinlargermemoryden-sities.Whenanew,smallerpackageisfirstreleasedbyavendor,thereisalwaysaninherentlagbeforethepackagebecomesavailablefromallvendors.Forexample,Microchipwasthefirstvendortooffer32-and64-KbitI2C™serialEEPROMsina5-leadSOT-23packageanditwilltaketimebeforeothervendorsoffersimilardevices.SystemdesignerscanusetheSOT-23packageandenjoytheassociatedbenefits,ortheycanmaintainabroadlistofpossiblevendors.Now,bycombiningfootprints,bothcanbedoneatthesametime.AN1420AddingFlexibilitybyUsingMultipleFootprintsforMicrowireSerialEEPROMsThisideacanalsobeappliedtoother8-leadpackages,Author:ChrisParrissuchastheTSSOPandMSOP,iftheapplicationMicrochipTechnologyInc.allowsforasmallamountofextraboardspacetobeused.INTRODUCTIONFIGURE1:COMBINED6-LEADSOT-23Formanyyears,the8-leadSOICpackagehasbeen……