_______________GeneralDescriptionTheMAX3100universalasynchronousreceivertransmit-ter(UART)isthefirstUARTspecificallyoptimizedforsmallmicrocontroller-basedsystems.UsinganSPI™/Microwire™interfaceforcommunicationwiththehostmicrocontroller(µC),theMAX3100comesinacom-pact16-pinQSOP.TheasynchronousI/OissuitableforuseinRS-232,RS-485,IR,andopto-isolateddatalinks.IR-linkcommunicationiseasywiththeMAX3100’sinfrareddataassociation(IrDA)timingmode.TheMAX3100includesacrystaloscillatorandabaud-rategeneratorwithsoftware-programmabledividerratiosforallcommonbaudratesfrom300baudto230kbaud.Asoftware-orhardware-invokedshutdownlowersquies-centcurrentto10µA,whileallowingtheMAX3100todetectreceiveractivity.An8-word-deepfirst-in/first-out(FIFO)bufferminimizesprocessoroverhead.Thisdevicealsoincludesaflexibleinterruptwithfourmaskablesources,includingaddressrecognitionon9-bitnetworks.Twohardware-handshak-ingcontrollinesareincluded(oneinputandoneoutput).TheMAX3100isavailablein14-pinplasticDIPandsmall,16-pinQSOPpackagesinthecommercialandextendedtemperatureranges.________________________ApplicationsHand-HeldInstrumentsIntelligentInstrumentationUARTinSPISystemsSmallNetworksinHVACorBuildingControlIsolatedRS-232/RS-485:DirectlyDrivesOpto-CouplersLow-CostIRDataLinksforComputers/Peripherals____________________________Features♦16-PinQSOPPackage(8-pinSOfootprint):SmallestUARTAvailable♦Full-FeaturedUART:—IrDASIRTimingCompatible—8-WordFIFOMinimizesProcessorOverheadatHighDataRates—Upto230kBaudwitha3.6864MHzCrystal—9-BitAddress-RecognitionInterrupt—ReceiveActivityInterruptinShutdown♦SPI/Microwire-CompatibleµCInterface♦LowestPower:—150µAOperatingCurrentat3.3V—10µAinShutdownwithReceiveInterrupt♦+2.7Vto+5.5VSupplyVoltageinOperatingMode♦Schmitt-TriggerInputsforOpto-Couplers♦TXandRTSOutputsSink25mAforOpto-CouplersMAX3100SPI/Microwire-CompatibleUARTinQSOP-16________________________________________________________________MaximIntegratedProducts11413121110981234567VCCTXRXRTSCSSCLKDOUTDINTOPVIEWMAX3100CTSX1X2GNDSHDNIRQDIP16151413121110912345678VCCTXRXRTSN.C.CTSX1X2DINDOUTSCLKCSN.C.IRQSHDNGNDMAX3100QSOP__________________________________________________________PinConfigurations19-1259;Rev1;12/01PARTMAX3100CPDMAX3100CEE0°Cto+70°C0°Cto+70°CTEMP.RANGEPIN-PACKAGE14PlasticDIP16QSOP______________OrderingInformationTypicalOperatingCircuitappearsatendofdatasheet.SPIisatrademarkofMotorola,Inc.MicrowireisatrademarkofNationalSemiconductorCorp.MAX3100EPDMAX3100EEE-40°Cto+85°C-40°Cto+85°C14PlasticDIP16QSOPForpricing,delivery,andorderinginformation,pleasecontactMaxim/DallasDirect!at1-888-629-4642,orvisitMaxim’swebsiteat(VCC=+2.7Vto+5.5V,TA=TMINtoTMAX,unlessotherwisenoted.Typicalvaluesaremeasuredat9600baudatTA=+25°C.)Stressesbeyondthoselistedunder“AbsoluteMaximumRatings”maycausepermanentdamagetothedevice.Thesearestressratingsonly,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedintheoperationalsectionsofthespecificationsisnotimplied.Exposuretoabsolutemaximumratingconditionsforextendedperiodsmayaffectdevicereliability.VCCtoGND...........................................................................+6VInputVoltagetoGND(CS,SHDN,X1,CTS,RX,DIN,SCLK)....-0.3Vto(VCC+0.3V)OutputVoltagetoGND(DOUT,RTS,TX,X2)..............................-0.3Vto(VCC+0.3V)IRQ...........................................................................-0.3Vto6VTX,RTSOutputCurrent....................................................100mAX2,DOUT,IRQShort-CircuitDuration(toVCCorGND).........................................................IndefiniteContinuousPowerDissipation(TA=+70°C)PlasticDIP(derate10.00mW/°Cabove+70°C)..........800mWQSOP(derate8.30mW/°Cabove+70°C).....................667mWOperatingTemperatureRangesMAX3100C__......................................................0°Cto+70°CMAX3100E__...................................................-40°Cto+85°CStorageTemperatureRange............................-65°Cto+160°CLeadTemperature(soldering,10sec)............................+300°CISOURCE=25µA,TXonlyVIRQ=5.5VISINK=4mADOUTonly,CS=VCCShutdownmodeActivemodeISOURCE=5mAVVCC=3.3VVX1=0Vand5.5VCONDITIONSVCC-0.5VOHOutputHighVoltagepF5COUTOutputCapacitanceµA±1ILKOutputLeakageV0.4VOLOutputLowVoltagepF5COUTOutputCapacitanceµA±1ILKOutputLeakageDOUT,TX,RTS:ISINK=4mATX,RTS:ISINK=25mAVpF5CINInputCapacitanceV0.3xVCCVILInputLowVoltageV0.7xVCCVIHInputHighVoltage0.4VOLOutputLowVoltage0.9VX1=0Vand5.5VVVCC/20.2xVCCVILInputLowVoltageV0.7xVCCVCC/2VIHInputHighVoltageV0.05xVCCVHYSTInputHysteresisµA±1IILInputLeakagepF5CINInputCapacitanceUNITSMINTYPMAXSYMBOLPARAMETER2IINInputCurrentµA25VCC-0.5mA0.271ICCVCCSupplyCurrentinNormalModeSHDNbit=1orSHDN=0,logicinputsareat0VorVCCµA10ICCVCCSupplyCurrentinShutdownWith1.8432MHzcrystal;allotherlogicinputsareat0VorVCCVCC=5VVCC=3.3V0.150.4V2.75.5VCC