ISL1208.pdf
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1FN8085.3ISL1208I2CRealTimeClock/CalendarLowPowerRTCwithBatteryBackedSRAMTheISL1208deviceisalowpowerrealtimeclockwithtimingandcrystalcompensation,clock/calendar,powerfailindicator,periodicorpolledalarm,intelligentbatterybackupswitchingandbattery-backeduserSRAM.Theoscillatorusesanexternal,low-cost32.768kHzcrystal.Therealtimeclocktrackstimewithseparateregistersforhours,minutes,andseconds.Thedevicehascalendarregistersfordate,month,yearanddayoftheweek.Thecalendarisaccuratethrough2099,withautomaticleapyearcorrection.PinoutISL1208(8-PINMSOP,SOIC)TOPVIEWFeaturesRealTimeClock/Calendar-TracksTimeinHours,Minutes,andSeconds-DayoftheWeek,Day,Month,andYear15SelectableFrequencyOutputsSingleAlarm-SettabletotheSecond,Minute,Hour,DayoftheWeek,Day,orMonth-SingleEventorPulseInterruptModeAutomaticBackuptoBatteryorSuperCapPowerFailureDetectionOn-ChipOscillatorCompensation2BytesBattery-BackedUserSRAMI2CInterface-400kHzDataTransferRate400nABatterySupplyCurrentSamePinOutasSTM41TxxandMaximDS13xxDevicesSmallPackageOptions-8LdMSOPandSOICPackagesPb-FreePlusAnnealAvailable(RoHSCompliant)ApplicationsUtilityMetersHVACEquipmentAudio/VideoComponentsSetTopBox/TelevisionModemsNetworkRouters,Hubs,Switches,BridgesCellularInfrastructureEquipmentFixedBroadbandWirelessEquipmentPagers/PDAPOSEquipmentTestMeters/FixturesOfficeAutomation(Copiers,Fax)HomeAppliancesComputerProductsOtherIndustrial/Medical/AutomotiveOrderingInformationPARTNUMBERMARKINGVDDRANGETEMP.RANGE(C)PACKAGEISL1208IU8AGSYWW2.7Vto5.5V-40to+858LdMSOPISL1208IU8-TKAGSYWW2.7Vto5.5V-40to+858LdMSOPTapeandReelISL1208IU8Z(SeeNote)ANWYWW2.7Vto5.5V-40to+858LdMSOP(Pb-free)ISL1208IU8Z-TK(SeeNote)ANWYWW2.7Vto5.5V-40to+858LdMSOPTapeandReel(Pb-free)ISL1208IB81208YWW2.7Vto5.5V-40to+858LdSOICISL1208IB8-TK1208YWW2.7Vto5.5V-40to+858LdSOICTapeandReelISL1208IB8Z(SeeNote)1208YWWZ2.7Vto5.5V-40to+858LdSOIC(Pb-free)ISL1208IB8Z-TK(SeeNote)1208YWWZ2.7Vto5.5V-40to+858LdSOICTapeandReel(Pb-free)NOTE:
IntersilPb-freeplusannealproductsemployspecialPb-freematerialsets;moldingcompounds/dieattachmaterialsand100%mattetinplateterminationfinish,whichareRoHScompliantandcompatiblewithbothSnPbandPb-freesolderingoperations.IntersilPb-freeproductsareMSLclassifiedatPb-freepeakreflowtemperaturesthatmeetorexceedthePb-freerequirementsofIPC/JEDECJSTD-020.*ContactFactoryforavailability.123487X1X2VBATVDDIRQ/FOUTSCLSDAGND56DataSheetJuly29,2005CAUTION:
Thesedevicesaresensitivetoelectrostaticdischarge;followproperICHandlingProcedures.1-888-INTERSILor1-888-468-3774|Intersil(anddesign)isaregisteredtrademarkofIntersilAmericasInc.CopyrightIntersilAmericasInc.2004,2005.AllRightsReservedAllothertrademarksmentionedarethepropertyoftheirrespectiveowners.2FN8085.3July29,2005BlockDiagramI2CINTERFACERTCCONTROLLOGICALARMFREQUENCYOUTRTCDIVIDERSDABUFFERCRYSTALOSCILLATORPORSWITCHSCLBUFFERSDASCLX1X2VDDVBATIRQ/FOUTINTERNALSUPPLYVTRIPSecondsMinutesHoursDayofWeekDateMonthYearUSERSRAMCONTROLREGISTERSPinDescriptionsPINNUMBERSYMBOLDESCRIPTION1X1TheX1pinistheinputofaninvertingamplifierandisintendedtobeconnectedtoonepinofanexternal32.768kHzquartzcrystal.X1canalsobedrivendirectlyfroma32.768kHzsource.2X2TheX2pinistheoutputofaninvertingamplifierandisintendedtobeconnectedtoonepinofanexternal32.768kHzquartzcrystal.3VBATThisinputprovidesabackupsupplyvoltagetothedevice.VBATsuppliespowertothedeviceintheeventthattheVDDsupplyfails.Thispinshouldbetiedtogroundifnotused.4GNDGround.5SDASerialData(SDA)isabidirectionalpinusedtotransferserialdataintoandoutofthedevice.IthasanopendrainoutputandmaybewireORedwithotheropendrainoropencollectoroutputs.6SCLTheSerialClock(SCL)inputisusedtoclockallserialdataintoandoutofthedevice.7IRQ/FOUTInterruptOutput/FrequencyOutputisamulti-functionalpinthatcanbeusedasinterruptorfrequencyoutputpin.Thefunctionissetviatheconfigurationregister.8VDDPowersupply.ISL12083FN8085.3July29,2005AbsoluteMaximumRatingsVoltageonVDD,VBAT,SCL,SDA,andIRQpins(respecttoground).-0.5Vto7.0VVoltageonX1andX2pins(respecttoground).-0.5VtoVDD+0.5(VDDMode)-0.5VtoVBAT+0.5(VBATMode)StorageTemperature.-65Cto+150CLeadTemperature(Soldering,10s).300CCAUTION:
Stressesabovethoselistedin“AbsoluteMaximumRatings”maycausepermanentdamagetothedevice.Thisisastressonlyratingandoperationofthedeviceattheseoranyotherconditionsabovethoseindicatedintheoperationalsectionsofthisspecificationisnotimplied.DCOperatingCharacteristicsRTCTemperature=-40Cto+85C,unlessotherwisestated.SYMBOLPARAMETERCONDITIONSMINTYP(Note4)MAXUNITSNOTESVDDMainPower