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1、1of15REV:040306GENERALDESCRIPTIONTheDS1338serialreal-timeclock(RTC)isalow-power,fullbinary-codeddecimal(BCD)clock/calendarplus56bytesofNVSRAM.AddressanddataaretransferredseriallythroughanI2C*interface.Theclock/calendarprovidesseconds,minutes,hours,day,date,month,andyearinformation.Theendofthemonthda
2、teisautomaticallyadjustedformonthswithfewerthan31days,includingcorrectionsforleapyear.Theclockoperatesineitherthe24-houror12-hourformatwithAM/PMindicator.TheDS1338hasabuilt-inpower-sensecircuitthatdetectspowerfailuresandautomaticallyswitchestothebatterysupply.APPLICATIONSHandhelds(GPS,POSTerminal)Co
3、nsumerElectronics(Set-TopBox,DigitalRecording,NetworkAppliance)OfficeEquipment(Fax/Printer,Copier)Medical(Glucometer,MedicineDispenser)Telecommunications(Router,Switcher,Server)Other(UtilityMeter,VendingMachine,Thermostat,Modem)TYPICALOPERATINGCIRCUITFEATURES?RTCCountsSeconds,Minutes,Hours,Dateofthe
4、Month,Month,DayoftheWeek,andYearwithLeap-YearCompensationValidUpto2100?AvailableinaSurface-MountPackagewithanIntegratedCrystal(DS1338C)?56-ByteBattery-BackedNVRAMforDataStorage?I2CSerialInterface?ProgrammableSquare-WaveOutputSignal?AutomaticPower-FailDetectandSwitchCircuitry?-40Cto+85COperatingTempe
5、ratureRange?UnderwritersLaboratory(UL)RecognizedORDERINGINFORMATIONPARTTEMPRANGEPIN-PACKAGETOPMARKDS1338Z-18-40Cto+85C8SO(0.150)DS1338-18DS1338Z-18+-40Cto+85C8SO(0.150)DS1338-18DS1338Z-3-40Cto+85C8SO(0.150)DS1338-3DS1338Z-3+-40Cto+85C8SO(0.150)DS1338-3DS1338Z-33-40Cto+85C8SO(0.150)DS1338-33DS1338Z-3
6、3+-40Cto+85C8SO(0.150)DS1338-33DS1338U-18-40Cto+85C8SOP1338rr-18DS1338U-18+-40Cto+85C8SOP1338rr-18DS1338U-3-40Cto+85C8SOP1338rr-3DS1338U-3+-40Cto+85C8SOP1338rr-3DS1338U-33-40Cto+85C8SOP1338rr-33DS1338U-33+-40Cto+85C8SOP1338rr-33DS1338C-18-40Cto+85C16SO(0.300)DS1338C-18DS1338C-18#-40Cto+85C16SO(0.300
7、)DS1338C-18DS1338C-3-40Cto+85C16SO(0.300)DS1338C-3DS1338C-3#-40Cto+85C16SO(0.300)DS1338C-3DS1338C-33-40Cto+85C16SO(0.300)DS1338C-33DS1338C-33#-40Cto+85C16SO(0.300)DS1338C-33rr=secondline,revisionlevel+Denotesalead-free/RoHS-compliantdevice.#DenotesaRoHS-compliantdevicethatmayincludeleadthatisexemptu
8、ndertheRoHSrequirements.TheleadfinishisJESD97categorye3,andiscompatiblewithbothlead-basedandlead-freesolderingprocesses.A“+”anywhereonthetopmarkdenotesalead-freedevice.A“#”denotesaRoHS-compliantdevice.DS1338I2CRTCwith56-ByteNVRAMwww.maxim-*PurchaseofI2CcomponentsfromMaximIntegratedProducts,Inc.,oron
9、eofitssublicensedAssociatedCompanies,conveysalicenseunderthePhilipsI2CPatentRightstousethesecomponentsinanI2Csystem,providedthatthesystemconformstotheI2CStandardSpecificationasdefinedbyPhilips.PinConfigurationsappearatendofdatasheet.DS1338CPUVCCVCCVCCSDASCLGNDX2X1VCCRPURPUCRYSTALSQW/OUTVBATiRPU=tr/C
10、bDS1338I2CRTCwith56-ByteNVRAM2of15ABSOLUTEMAXIMUMRATINGSVoltageRangeonAnyPinRelativetoGround.-0.3Vto+6.0VOperatingTemperatureRange.-40Cto+85CStorageTemperatureRange.-55Cto+125CSolderingTemperature.SeeprecautionsintheHandling,PCBoardLayout,andAssemblySection.Stressesbeyondthoselistedunder“AbsoluteMax
11、imumRatings”maycausepermanentdamagetothedevice.Thesearestressratingsonly,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedintheoperationalsectionsofthespecificationsisnotimplied.Exposuretotheabsolutemaximumratingconditionsforextendedperiodsmayaffectdevicereliability.RE
12、COMMENDEDDCOPERATINGCONDITIONS(VCC=VCC(MIN)toVCC(MAX),TA=-40Cto+85C,unlessotherwisenoted.TypicalvaluesareatVCC=3.3V,TA=+25C,unlessotherwisenoted.)(Note1)PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSDS1338-181.711.81.89DS1338-32.73.03.3SupplyVoltageVCCDS1338-333.03.33.63VLogic1VIH(Note2)0.7xVCCVCC+0.3VLogi
13、c0VIL(Note2)-0.3+0.3xVCCVDS1338-181.511.621.71DS1338-32.452.592.70Power-FailVoltageVPFDS1338-332.702.822.97VVBATBatteryVoltageVBAT(Note2)1.33.03.7VDCELECTRICALCHARACTERISTICS(VCC=VCC(MIN)toVCC(MAX),TA=-40Cto+85C,unlessotherwisenoted.TypicalvaluesareatVCC=3.3V,TA=+25C,unlessotherwisenoted.)(Note1)PAR
14、AMETERSYMBOLCONDITIONSMINTYPMAXUNITSVBATBatteryVoltageVBAT(Note2)1.33.7VInputLeakageILI(Note3)1AI/OLeakageILO(Note4)1AVCC2V;VOL=0.4V3.0SDALogic0OutputIOLSDAVCC2V;VOL=0.4V3.01.71VVCC2V;VOL=0.2VCC3.0mASQW/OUTLogic0OutputIOLSQW1.3VVCC1.71V;VOL=0.2VCC250ADS1338-1875150DS1338-3110200ActiveSupplyCurrent(N
15、ote5)ICCADS1338-33120200ADS1338-1860100DS1338-380125StandbyCurrent(Note6)ICCSDS1338-3385125AVBATLeakageCurrent(VCCActive)IBATLKG25100nADS1338I2CRTCwith56-ByteNVRAM3of15DCELECTRICALCHARACTERISTICS(VCC=0V,TA=-40Cto+85C,unlessotherwisenoted.TypicalvaluesareatVBAT=3.0V,TA=+25C,unlessotherwisenoted.)(Not
16、e1)PARAMETERSYMBOLMINTYPMAXUNITSVBATCurrent(OSCON);VBAT=3.7V,SQW/OUTOFF(Note7)IBATOSC18001200nAVBATCurrent(OSCON);VBAT=3.7V,SQW/OUTON(32kHz)(Note7)IBATOSC210251400nAVBATData-RetentionCurrent(OscOff);VBAT=3.7V(Note7)IBATDAT10100nAACELECTRICALCHARACTERISTICS(TA=-40Cto+85C)(Note1)PARAMETERSYMBOLCONDITIONMINTYPMAXUNITSFastmode100400SCLClockFrequencyfSCLStandardmode0100kHzFastmode1.3BusFreeTimeBetweenSTOPandSTARTConditiontBUFStandardmode4.7sFastmode0.6HoldTime(Repeated)STARTCondition(No
