LM231AN

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LM231,LM331 www.ti.com SNOSBI2B –JUNE 1999–REVISED MARCH 2013 LM231A/LM231/LM331A/LM331PrecisionVoltage-to-FrequencyConverters Check forSamples: LM231 ,LM331 1FEATURES DESCRIPTION The LM231/LM331 familyof voltage-to-frequency 23• Ensured Linearity0.01% max convertersare ideallysuitedforuse in simplelow-• Improved Performance inExistingVoltage-to- costcircuitsforanalog-to-digitalconversion,precisionFrequency Conversion Applications frequency-to-voltage conversion, long-term

• Splitor SingleSupply Operation integration,linear frequency modulation or demodulation,and many otherfunctions.The output• Operates on Single5V Supply when used as a voltage-to-frequencyconverterisa• Pulse Output Compatible withAllLogic Forms pulsetrainata frequencypreciselyproportionaltothe
• ExcellentTemperature Stability:±50 ppm/ °C applied input voltage.Thus, it provides all the max inherentadvantages of the voltage-to-frequency conversiontechniques,and is easy to apply in all• Low Power Consumption: 15 mW Typicalat5V standardvoltage-to-frequencyconverterapplications.• Wide Dynamic Range, 100 dB min at10 kHz Further,theLM231A/LM331A attaina new highlevelFullScaleFrequency ofaccuracyversustemperaturewhich couldonlybe
• Wide Range ofFullScaleFrequency:1 Hz to attained with expensive voltage-to-frequency modules. Additionallythe LM231/331 are ideally100 kHz suitedforuse indigitalsystems atlow power supply• Low Cost voltagesand can providelow-costanalog-to-digital conversion in microprocessor-controlledsystems. And, the frequencyfrom a batterypowered voltage- to-frequencyconvertercan be easilychanneled througha simplephoto isolatorto provideisolation againsthighcommon mode levels. The LM231/LM331 utilizea new temperature- compensated band-gap referencecircuit,to provide excellentaccuracyoverthefulloperatingtemperature range, at power suppliesas low as 4.0V. The precisiontimercircuithas low biascurrentswithout degradingthequickresponsenecessaryfor100 kHz voltage-to-frequencyconversion.And the outputare capable of driving3 TTL loads,or a high voltage outputup to 40V, yet is short-circuit-proofagainst VCC . CONNECTION DIAGRAM Figure1. PlasticDual-In-LinePackage (PDIP) See Package Number P (R-PDIP-T8) Pleasebe aware thatan importantnoticeconcerningavailability,standardwarranty,and use incriticalapplicationsof Texas Instrumentssemiconductorproductsand disclaimerstheretoappearsattheend ofthisdatasheet. 2Teflonisa registeredtrademarkofE. 3Allothertrademarksarethepropertyoftheirrespectiveowners. PRODUCTION DATA informationiscurrentas ofpublicationdate. Copyright© 1999–2013,Texas InstrumentsIncorporatedProductsconform to specificationsper the terms of the Texas Instrumentsstandardwarranty.Productionprocessingdoes not necessarilyincludetestingofallparameters.

LM231,LM331 SNOSBI2B –JUNE 1999–REVISED MARCH 2013 www.ti.com These deviceshave limitedbuilt-inESD protection.The leadsshouldbe shortedtogetherorthedeviceplacedinconductivefoam duringstorageorhandlingtopreventelectrostaticdamage totheMOS gates. AbsoluteMaximum Ratings(1)(2)(3) SupplyVoltage,VS 40V OutputShortCircuittoGround Continuous OutputShortCircuittoVCC Continuous InputVoltage −0.2Vto+VS Package Dissipationat25°C 1.25W (4) Lead Temperature(Soldering,10 sec.) PDIP 260°C ESD Susceptibility(5) 500V (1) AbsoluteMaximum Ratingsindicatelimitsbeyond whichdamage tothedevicemay occur.DC and AC electricalspecificationsdo not applywhen operatingthedevicebeyond itsspecifiedoperatingconditions. (2) Allvoltagesaremeasured withrespecttoGND = 0V,unlessotherwisenoted. (3) IfMilitary/Aerospacespecifieddevicesarerequired,pleasecontacttheTISalesOffice/Distributorsforavailabilityand specifications. (4) The absolutemaximum junctiontemperature(TJmax) forthisdeviceis150°C. The maximum allowablepower dissipationisdictatedby TJmax, thejunction-to-ambientthermalresistance(θJA),and theambienttemperatureTA,and can be calculatedusingtheformula PD max = (TJmax -TA)/θJA.The valuesformaximum power dissipationwillbe reachedonlywhen thedeviceisoperatedina severe faultcondition(e.g.,when inputoroutputpinsaredrivenbeyond thepower supplyvoltages,orthepower supplypolarityisreversed). Obviously,such conditionsshouldalwaysbe avoided. (5) Human body model,100 pF dischargedthrougha 1.5kΩ resistor. OperatingRatings (1) OperatingAmbientTemperature LM231, LM231A −25°C to+85°C LM331, LM331A 0°C to+70°C SupplyVoltage,VS +4V to+40V (1) Allvoltagesaremeasured withrespecttoGND = 0V,unlessotherwisenoted. Package Thermal Resistance Package θJ-A 8-LeadPDIP 100°C/W ElectricalCharacteristics AllspecificationsapplyinthecircuitofFigure16,with4.0V≤ VS ≤ 40V,TA=25°C, unlessotherwisespecified. Parameter Conditions Min Typ Max Units 4.5V≤ VS ≤ 20V ±0.003 ±0.01 % Full-Scale VFC Non-Linearity(1) TMIN ≤ TA ≤ TMAX ±0.006 ±0.02 % Full-Scale VFC Non-LinearityinCircuitofFigure15 VS = 15V,f= 10 Hz to11 kHz ±0.024 ±0.14 %Full-Scale ConversionAccuracyScaleFactor(Gain) LM231, LM231A VIN = −10V,R S = 14 kΩ 0.95 1.00 1.05 kHz/V LM331, LM331A 0.90 1.00 1.10 kHz/V TemperatureStabilityofGain LM231/LM331 TMIN ≤ TA ≤ TMAX ,4.5V≤ VS ≤ 20V ±30 ±150 ppm/°C LM231A/LM331A ±20 ±50 ppm/°C Change ofGain withVS 10V ≤ VS ≤ 40V 0.006 0.06 %/V Rated Full-ScaleFrequency VIN = −10V 10.0 kHz Gain Stabilityvs.Time (1000Hours) TMIN ≤ TA ≤ TMAX ±0.02 % Full-Scale (1) Nonlinearityisdefinedas thedeviationoffOUT fromVIN × (10kHz/−10 VDC )when thecircuithas been trimmedforzeroerrorat10 Hz and at10 kHz,overthefrequencyrange1 Hz to11 kHz.Forthetimingcapacitor,C T,use NPO ceramic,Teflon® ,orpolystyrene.

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LM231,LM331 www.ti.com SNOSBI2B –JUNE 1999–REVISED MARCH 2013 ElectricalCharacteristics(continued) AllspecificationsapplyinthecircuitofFigure16,with4.0V≤ VS ≤ 40V,TA=25°C, unlessotherwisespecified. Parameter Conditions Min Typ Max Units Over Range (BeyondFull-Scale)Frequency VIN = −11V 10 % INPUT COMPARATOR OffsetVoltage ±3 ±10 mV LM231/LM331 TMIN ≤ TA ≤ TMAX ±4 ±14 mV LM231A/LM331A TMIN ≤ TA ≤ TMAX ±3 ±10 mV BiasCurrent −80 −300 nA OffsetCurrent ±8 ±100 nA VCC −2.Common-Mode Range TMIN ≤ TA ≤ TMAX −0.2 V0 TIMER TimerThresholdVoltage,Pin5 0.63 0.667 0.70 × VS InputBiasCurrent,Pin5 VS = 15V AllDevices 0V ≤ VPIN 5 ≤ 9.9V ±10 ±100 nA LM231/LM331 VPIN 5 = 10V 200 1000 nA LM231A/LM331A VPIN 5 = 10V 200 500 nA VSAT PIN 5 (Reset) I= 5 mA 0.22 0.5 V CURRENT SOURCE (Pin1) OutputCurrent LM231, LM231A R S = 14 kΩ,VPIN 1 = 0 126 135 144 μA LM331, LM331A 116 136 156 μA Change withVoltage 0V ≤ VPIN 1 ≤ 10V 0.2 1.0 μA CurrentSourceOFF Leakage LM231, LM231A, LM331, LM331A 0.02 10.0 nA AllDevices TA = TMAX 2.0 50.0 nA OperatingRange ofCurrent(Typical) (10to500) μA REFERENCE VOLTAGE (Pin2) LM231, LM231A 1.76 1.89 2.02 VDC LM331, LM331A 1.70 1.89 2.08 VDC Stabilityvs.Temperature ±60 ppm/°C Stabilityvs.Time,1000 Hours ±0.1 % LOGIC OUTPUT (Pin3) I= 5 mA 0.15 0.50 V VSAT I= 3.2mA (2TTL Loads),TMIN ≤ TA ≤ 0.10 0.40 VTMAX OFF Leakage ±0.05 1.0 μA SUPPLY CURRENT VS = 5V 2.0 3.0 4.0 mA LM231, LM231A VS = 40V 2.5 4.0 6.0 mA VS = 5V 1.5 3.0 6.0 mA LM331, LM331A VS = 40V 2.0 4.0 8.0 mA Copyright© 1999–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 3 ProductFolderLinks:LM231 LM331

LM231,LM331 SNOSBI2B –JUNE 1999–REVISED MARCH 2013 www.ti.com FUNCTIONAL BLOCK DIAGRAM Pinnumbers applyto8-pinpackagesonly.

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LM231,LM331 www.ti.com SNOSBI2B –JUNE 1999–REVISED MARCH 2013 TYPICAL PERFORMANCE CHARACTERISTICS (AllelectricalcharacteristicsapplyforthecircuitofFigure16,unlessotherwisenoted.) NonlinearityError as PrecisionV-to-F Converter(Figure16) NonlinearityError Figure2. Figure3. NonlinearityError vs. Frequency Power vs. Supply Voltage Temperature Figure4. Figure5. VREF Output Frequency vs. vs. Temperature VSUPPLY Figure6. Figure7. Copyright© 1999–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 5 ProductFolderLinks:LM231 LM331

LM231,LM331 SNOSBI2B –JUNE 1999–REVISED MARCH 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) (AllelectricalcharacteristicsapplyforthecircuitofFigure16,unlessotherwisenoted.) 100 kHz NonlinearityError NonlinearityError (Figure17) (Figure15) Figure8. Figure9. Power Drain InputCurrent(Pins6,7)vs. vs. Temperature VSUPPLY Figure10. Figure11. Output SaturationVoltagevs. NonlinearityError,Precision IOUT (Pin3) F-to-VConverter(Figure19) Figure12. Figure13.

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LM231,LM331 www.ti.com SNOSBI2B –JUNE 1999–REVISED MARCH 2013 APPLICATIONS INFORMATION PRINCIPLES OF OPERATION The LM231/331 aremonolithiccircuitsdesignedforaccuracyand versatileoperationwhen appliedas voltage-to- frequency(V-to-F)convertersor as frequency-to-voltage(F-to-V)converters.A simplifiedblockdiagramofthe LM231/331 isshown inFigure14 and consistsofa switchedcurrentsource,inputcomparator,and 1-shottimer. Figure14. SimplifiedBlock Diagram ofStand-Alone Voltage-to-FrequencyConverterand ExternalComponents SimplifiedVoltage-to-FrequencyConverter The operationof these blocksisbest understoodby going throughthe operatingcycleof the basicV-to-F converter,Figure14,which consistsofthesimplifiedblockdiagramoftheLM231/331 and thevariousresistors and capacitorsconnectedtoit. The voltagecomparatorcompares a positiveinputvoltage,V1, at pin7 to the voltage,Vx, at pin6. IfV1 is greater,the comparatorwilltriggerthe 1-shottimer.The outputof the timerwillturnON both the frequency outputtransistorand theswitchedcurrentsourcefora periodt=1.1R tC t.Duringthisperiod,thecurrentiwillflow outoftheswitchedcurrentsourceand providea fixedamount ofcharge,Q = i× t,intothecapacitor,C L.Thiswill normallychargeVx up toa higherlevelthanV1. At theend ofthetimingperiod,thecurrentiwillturnOFF, and thetimerwillresetitself. Now thereisno currentflowingfrompin1,and thecapacitorC L willbe graduallydischargedby R L untilVx falls tothelevelofV1.Then thecomparatorwilltriggerthetimerand startanothercycle. The currentflowingintoC L isexactlyIAVE = i× (1.1×R tC t)× f,and thecurrentflowingoutofC L isexactlyVx/RL ≃ VIN/RL.IfVIN isdoubled,thefrequencywilldoubletomaintainthisbalance.Even a simpleV-to-Fconvertercan providea frequencypreciselyproportionaltoitsinputvoltageovera widerangeoffrequencies. DetailofOperation,FunctionalBlock Diagram The blockdiagram(FUNCTIONAL BLOCK DIAGRAM )shows a band gap referencewhichprovidesa stable1.9 VDC output.This1.9VDC iswellregulatedovera VS range of3.9V to40V. Italsohas a flat,low temperature coefficient,and typicallychanges lessthan½ % overa 100°C temperaturechange. The currentpump circuitforcesthevoltageatpin2 tobe at1.9V,and causes a currenti=1.90V/RS toflow.For R s=14k,i=135μA. The precisioncurrentreflectorprovidesa currentequaltoitothecurrentswitch.The current switchswitchesthecurrenttopin1 ortoground,dependingupon thestateoftheR S flip-flop. The timingfunctionconsistsofan R S flip-flopand a timercomparatorconnectedtotheexternalR tC t network. When theinputcomparatordetectsa voltageatpin7 higherthanpin6,itsetstheR S flip-flopwhichturnsON the currentswitchand theoutputdrivertransistor.When thevoltageatpin5 risesto⅔ VCC ,thetimercomparator causestheR S flip-floptoreset.The resettransistoristhenturnedON and thecurrentswitchisturnedOFF. Copyright© 1999–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 7 ProductFolderLinks:LM231 LM331

LM231,LM331 SNOSBI2B –JUNE 1999–REVISED MARCH 2013 www.ti.com However,iftheinputcomparatorstilldetectspin7 higherthanpin6 when pin5 crosses⅔ VCC ,theflip-flopwill notbe reset,and thecurrentatpin1 willcontinuetoflow,tryingtomake thevoltageatpin6 higherthanpin7. Thisconditionwillusuallyapplyunder start-upconditionsor inthecase ofan overloadvoltageatsignalinput. Duringthissortofoverloadtheoutputfrequencywillbe 0.As soon as thesignalisrestoredtotheworkingrange, theoutputfrequencywillbe resumed. The outputdrivertransistoractstosaturatepin3 withan ON resistanceofabout50Ω.Incase ofovervoltage, theoutputcurrentisactivelylimitedtolessthan50 mA. The voltageatpin2 isregulatedat1.90VDC forallvaluesofibetween 10 μA to500 μA. Itcan be used as a voltagereferenceforothercomponents,butcaremust be takentoensurethatcurrentisnottakenfromitwhich couldreducetheaccuracyoftheconverter. Basic Voltage-to-FrequencyConverter(Figure15) The simplestand-aloneV-to-Fconvertershown inFigure15 includesallthebasiccircuitryofFigure14 plusa few components forimprovedperformance. A resistor,R IN=100 kΩ ±10%, has been added inthepath to pin7, so thatthe biascurrentat pin7 (−80 nA typical)willcanceltheeffectofthebiascurrentatpin6 and helpprovideminimum frequencyoffset. The resistanceR S at pin2 ismade up of a 12 kΩ fixedresistorplusa 5 kΩ (cermet,preferably)gainadjust rheostat.The functionofthisadjustmentistotrimoutthegaintoleranceoftheLM231/331,and thetoleranceof R t,R L and C t. Forbestresults,allthecomponents shouldbe stablelow-temperature-coefficientcomponents,such as metal-film resistors.The capacitorshouldhave low dielectricabsorption;depending on the temperaturecharacteristics desired,NPO ceramic,polystyrene,Teflonorpolypropylenearebestsuited. A capacitorC IN isadded from pin7 to ground to actas a filterforVIN. A valueof 0.01 μF to 0.1 μF willbe adequate inmost cases;however,incases where betterfilteringisrequired,a 1 μF capacitorcan be used. When theRC timeconstantsare matched atpin6 and pin7,a voltagestepatVIN willcause a stepchange in fOUT .IfC IN ismuch lessthanC L,a stepatVIN may cause fOUT tostopmomentarily. A 47Ω resistor,inserieswiththe 1 μF C L, provideshysteresis,which helpsthe inputcomparatorprovidethe excellentlinearity. *Use stablecomponents withlowtemperaturecoefficients.See APPLICATIONS INFORMATION . **0.1μF or1μF,See PRINCIPLES OF OPERATION . Figure15. Simple Stand-AloneV-to-FConverter with±0.03% TypicalLinearity(f= 10 Hz to11 kHz)

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LM231,LM331 www.ti.com SNOSBI2B –JUNE 1999–REVISED MARCH 2013 DetailsofOperation:PrecisionV-To-FConverter(Figure16) Inthiscircuit,integrationisperformedby usinga conventionaloperationalamplifierand feedbackcapacitor,C F. When theintegrator'soutputcrossesthenominalthresholdlevelatpin6 oftheLM231/331,thetimingcycleis initiated. The averagecurrentfedintotheop-amp'ssumming point(pin2)isi× (1.1R tC t)× fwhichisperfectlybalanced with−VIN/RIN.Inthiscircuit,thevoltageoffsetoftheLM231/331 inputcomparatordoes notaffecttheoffsetor accuracyoftheV-to-Fconverteras itdoes inthestand-aloneV-to-Fconverter;nor does theLM231/331 bias currentor offsetcurrent.Instead,theoffsetvoltageand offsetcurrentoftheoperationalamplifierare theonly limitson how smallthesignalcan be accuratelyconverted.Sinceop-amps withvoltageoffsetwellbelow 1 mV and offsetcurrentswellbelow 2 nA are availableatlow cost,thiscircuitisrecommended forbestaccuracyfor smallsignals.Thiscircuitalsorespondsimmediatelytoany change ofinputsignal(whicha stand-alonecircuit does not)so thattheoutputfrequencywillbe an accuraterepresentationofVIN,as quicklyas 2 outputpulses' spacingcan be measured. In the precisionmode, excellentlinearityisobtainedbecause the currentsource(pin1) isalways at ground potentialand thatvoltagedoes notvarywithVIN orfOUT .(Inthestand-aloneV-to-Fconverter,a majorcause of non-linearityistheoutputimpedance atpin1 whichcausesitochange as a functionofVIN). The circuitofFigure17 operatesinthesame way as Figure16,butwiththenecessarychanges forhighspeed operation. *Use stablecomponents withlowtemperaturecoefficients.See APPLICATIONS INFORMATION . Thisresistorcan be 5 kΩ or10 kΩ forVS=8V to22V,butmust be 10 kΩ forVS=4.5V to8V. *Uselowoffsetvoltageand lowoffsetcurrentop-amps forA1:recommended typeLF411A Figure16. Standard TestCircuitand ApplicationsCircuit,PrecisionVoltage-to-FrequencyConverter DETAILS OF OPERATION: F-to-VCONVERTERS (Figure18 and Figure19) Intheseapplications,a pulseinputatfIN isdifferentiatedby a C-R networkand thenegative-goingedge atpin6 causes the inputcomparatorto triggerthe timercircuit.Justas witha V-to-Fconverter,the average current flowingoutofpin1 isIAVERAGE = i× (1.1R tC t)× f. Copyright© 1999–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 9 ProductFolderLinks:LM231 LM331

LM231,LM331 SNOSBI2B –JUNE 1999–REVISED MARCH 2013 www.ti.com InthesimplecircuitofFigure18,thiscurrentisfilteredinthenetworkR L = 100 kΩ and 1 μF.The ripplewillbe lessthan10 mV peak,buttheresponsewillbe slow,witha 0.1second timeconstant,and settlingof0.7second to0.1% accuracy. Intheprecisioncircuit,an operationalamplifierprovidesa bufferedoutputand alsoactsas a 2-polefilter.The ripplewillbe lessthan5 mV peak forallfrequenciesabove 1 kHz,and theresponsetimewillbe much quicker thaninFigure18.However,forinputfrequenciesbelow 200 Hz, thiscircuitwillhave worse ripplethanFigure18. The engineeringofthefiltertime-constantstogetadequateresponseand smallenough ripplesimplyrequiresa studyofthecompromises tobe made. Inherently,V-to-Fconverterresponsecan be fast,butF-to-Vresponse can not. *Use stablecomponents withlowtemperaturecoefficients. See APPLICATIONS INFORMATION . Thisresistorcan be 5 kΩ or10 kΩ forVS=8V to22V,butmust be 10 kΩ forVS=4.5V to8V. *Uselowoffsetvoltageand lowoffsetcurrentop-amps forA1:recommended typesLF411A orLF356. Figure17. PrecisionVoltage-to-FrequencyConverter, 100 kHz Full-Scale,±0.03% Non-Linearity *Use stablecomponents withlowtemperaturecoefficients. Figure18. Simple Frequency-to-VoltageConverter, 10 kHz Full-Scale,±0.06% Non-Linearity

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LM231,LM331 www.ti.com SNOSBI2B –JUNE 1999–REVISED MARCH 2013 *Use stablecomponents withlowtemperaturecoefficients. Figure19. PrecisionFrequency-to-VoltageConverter, 10 kHz Full-Scalewith2-PoleFilter,±0.01% Non-LinearityMaximum *L14F-1,L14G-1 orL14H-1,phototransistor(GeneralElectricCo.)orsimilar Figure20. LightIntensitytoFrequency Converter Figure21. Temperature toFrequency Converter Copyright© 1999–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 11 ProductFolderLinks:LM231 LM331

LM231,LM331 SNOSBI2B –JUNE 1999–REVISED MARCH 2013 www.ti.com Figure22. Long-Term DigitalIntegratorUsing VFC Figure23. Basic Analog-to-DigitalConverterUsing Voltage-to-FrequencyConverter Figure24. Analog-to-DigitalConverterwithMicroprocessor Figure25. Remote Voltage-to-FrequencyConverterwith2-WireTransmitterand Receiver

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LM231,LM331 www.ti.com SNOSBI2B –JUNE 1999–REVISED MARCH 2013 Figure26. Voltage-to-FrequencyConverterwithSquare-Wave Output Using ÷ 2 Flip-Flop Figure27. Voltage-to-FrequencyConverterwithIsolators Figure28. Voltage-to-FrequencyConverterwithIsolators Copyright© 1999–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 13 ProductFolderLinks:LM231 LM331

LM231,LM331 SNOSBI2B –JUNE 1999–REVISED MARCH 2013 www.ti.com Figure29. Voltage-to-FrequencyConverterwithIsolators Figure30. Voltage-to-FrequencyConverterwithIsolators

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LM231,LM331 www.ti.com SNOSBI2B –JUNE 1999–REVISED MARCH 2013 Schematic Diagram Copyright© 1999–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 15 ProductFolderLinks:LM231 LM331

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REVISION HISTORY

Changes from RevisionA (March 2013)toRevisionB Page

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www.ti.com 1-Nov-2013 Addendum-Page 1 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Qty Eco Plan (2) Lead/Ball Finish (6) MSL Peak Temp (3) Op Temp (°C) Device Marking (4/5) Samples LM231AN NRND PDIP P 8 40 TBD Call TI Call TI -25 to 85 LM 231AN LM231AN/NOPB ACTIVE PDIP P 8 40 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM -25 to 85 LM 231AN LM231N NRND PDIP P 8 40 TBD Call TI Call TI -25 to 85 LM 231N LM231N/NOPB ACTIVE PDIP P 8 40 Green (RoHS & no Sb/Br) SN | CU SN Level-1-NA-UNLIM -25 to 85 LM 231N LM331AN NRND PDIP P 8 40 TBD Call TI Call TI LM 331AN LM331AN/NOPB ACTIVE PDIP P 8 40 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM LM 331AN LM331N NRND PDIP P 8 40 TBD Call TI Call TI 0 to 70 LM 331N LM331N/NOPB ACTIVE PDIP P 8 40 Green (RoHS & no Sb/Br) SN | CU SN Level-1-NA-UNLIM 0 to 70 LM 331N RC4151NB NRND PDIP P 8 40 TBD Call TI Call TI 0 to 70 LM 331N RV4151NB NRND PDIP P 8 40 TBD Call TI Call TI -25 to 85 LM 231N (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)

www.ti.com 1-Nov-2013 Addendum-Page 2 (3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device. (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.

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