SM72240 TI1 | Alldatasheet
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www.ti.com SNIS154C –JANUARY 2011–REVISED APRIL 2013 SM72240SolarMagic5-PinMicroprocessorResetCircuit Check forSamples: SM72240 1FEATURES DESCRIPTION The SM72240 microprocessorsupervisorycircuit 2• Renewable Energy Grade monitorsthe power suppliesin microprocessorand• Precisemonitoringof5V supply voltages digitalsystems. It provides a reset to the
- Fullyspecifiedover temperature microprocessor during power-up, power-down, brown-outconditions,and manual reset.– −40°C to+125°C
- 100 ms minimum Power-On Reset pulsewidth, The SM72240 assertsa resetsignalwhenever the supply decreases below the factory-programmed190 ms typical: resetthreshold.Reset willbe assertedforat least– Active-LowRESET Open DrainOutput 100ms even after VCC rises above the reset• RESET Output validforVCC ≥ 1V threshold.
- Low Supply Current,6µA typical The SM72240 has an active-lowopen-drainRESET• Power supply transientimmunity output.
- Compatible withMAX811/812 applications The SM72240 issuitableformonitoring5V. With a low supplycurrentofonly6µA, theSM72240 isidealAPPLICATIONS for use in portableequipment.The SM72240 is availableinthe5-pinSOT-23 package.• MicroprocessorSystems
- Computers
- Controllers
- IntelligentInstruments
- Portable/Battery-PoweredEquipment TypicalApplicationCircuit Pleasebe aware thatan importantnoticeconcerningavailability,standardwarranty,and use incriticalapplicationsof Texas Instrumentssemiconductorproductsand disclaimerstheretoappearsattheend ofthisdatasheet. 2Alltrademarksarethepropertyoftheirrespectiveowners. PRODUCTION DATA informationiscurrentas ofpublicationdate. Copyright© 2011–2013,Texas InstrumentsIncorporatedProductsconform to specificationsper the terms of the Texas Instrumentsstandardwarranty.Productionprocessingdoes not necessarilyincludetestingofallparameters.
1.225V Reference MR RESET GND VCC SM72240 3 4 MRRESET GND SM72240 SNIS154C –JANUARY 2011–REVISED APRIL 2013 www.ti.com Connection Diagram Figure1. 5-PinSOT-23 Package See Package Number DBV PIN DESCRIPTIONS Pin Name Function
1 GND Ground reference
2 GND Ground reference,devicesubstrate,connecttoground. Active-lowoutput.RESET remainslowwhileVCC isbelowtheresetthresholdvoltage,and for1903 RESET ms afterVCC risesabove theresetthresholdvoltage. Active-lowinput.Resetisassertedwhenever thispinispulledlowand remainsassertedfor190 ms4 MR aftertheMR pingoes high.May be leftopen.
5 VCC SupplyVoltage(+5V,nominal)
Figure2. SM72240 Block Diagram These deviceshave limitedbuilt-inESD protection.The leadsshouldbe shortedtogetherorthedeviceplacedinconductivefoam duringstorageorhandlingtopreventelectrostaticdamage totheMOS gates.
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www.ti.com SNIS154C –JANUARY 2011–REVISED APRIL 2013 AbsoluteMaximum Ratings(1)(2) VCC ,MR −0.3Vto6.0V RESET, RESET −0.3Vto(VCC + 0.3V) InputCurrent,VCC Pin 20mA OutputCurrent,RESET, RESET Pin 20mA ESD Rating(3) 2kV ContinuousPower Dissipation(TA = +70°C) SOT-23 (4) 320mW OperatingTemperatureRange −40°C to+125°C Maximum JunctionTemperature 125°C StorageTemperatureRange −65°C to+160°C Lead Temperature(soldering,10sec) +300°C (1) AbsoluteMaximum Ratingsarelimitsbeyond whichdamage tothedevicemay occur.OperatingRatingsareconditionsunderwhichthe deviceoperatescorrectly.Operatingratingsdo notimplyspecifiedperformancelimits.Forperformancelimitsand associatedtest conditions,see theElectricalCharacteristics. (2) IfMilitary/Aerospacespecifieddevicesarerequired,pleasecontacttheTexas InstrumentsSalesOffice/Distributorsforavailabilityand specifications. (3) The human body model isa 100pF capacitordischargedthrougha 1.5kΩ resistorintoeach pin. (4) Atelevatedtemperatures,devicesmust be deratedbased on package thermalresistance.The devicemust be deratedat4.5mW/°C at ambienttemperaturesabove 70°C. The devicehas internalthermalprotection. ElectricalCharacteristics TypicalvaluesareatTA = +25°C. LimitswithstandardtypefaceareforTA = +25°C, and limitsinboldfacetypeapplyforthe operatingtemperaturerange−40°C to+125°C ,unlessotherwisenoted.(1) Symbol Parameter Conditions Min Typ Max Units VCC VCC Range 1.0 5.5 V SM72240-4.63 VCC = 5.5V 8 15SupplyCurrentICC µA(ILOAD = 0A) SM72240-3.08 VCC = 3.6V 7 10 VTH ResetThreshold V VTH ResetThresholdTemperature 30 ppm/°CTempco Coefficient tRD VCC toResetDelay(2) VCC = VTH to(VTH − 100mV) 20 µs tRP ResetActiveTimeoutPeriod 100 190 560 ms tMR MR Minimum PulseWidth 10 µs MR toResetPropagationtMD 2 µsDelay MR GlitchImmunity(3) 100 ns VIH 2.3 MR InputThreshold VCC > VTH(MAX) V VIL 0.8 MR Pull-UpResistance 22 kΩ RESETOutput VoltageLow VCC = VTH min,ISINK = 3.2mA 0.4 VOL V VCC > 1V,ISINK = 50µA 0.3 IIN RESET OutputLeakage 0.5 µAVCC > VTH ,RESET = 5.5VCurrent(SM72240) (1) Productiontestingdone atTA = +25°C. LimitsovertheoperatingtemperaturerangearespecifiedthroughcorrelationusingStatistical QualityControl(SQC) methods. (2) RESET output. (3) Glitchesof100 ns orlesstypicallywillnotgeneratea resetpulse. Copyright© 2011–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 3 ProductFolderLinks:SM72240
VOL (mV) SINK CURRENT (mA) VCC = 2.5V VCC = 3.3V VCC = 5V 600 700 500 400 300 200 100 -40 -20 0 20 40 60 0.995 0.996 0.997 0.998 0.999 1.000 1.001 1.002 1.003 1.004 1.005 TEMPERATURE ( oC) NORMALIZED V TH 0.95 0.975 1.025 1.05 2 3 4 5 6 VCC (V) NORMALIZED RESET TIMEOUT 150 160 170 180 190 200 210 RESET TIMEOUT (ms) -40 -20 0 20 40 60 80 TEMPERATURE ( oC) VCC (V) ICC (PA) 0 1 2 3 4 5 -40 -15 10 35 60 85 TEMPERATURE ( oC) SUPPLY CURRENT ( PA) VCC = 5.5V VCC = 3.6V VCC = 2.5V SM72240 SNIS154C –JANUARY 2011–REVISED APRIL 2013 www.ti.com TypicalPerformance Characteristics Supply Currentvs VCC Supply Currentvs Temperature Figure3. Figure4. Reset Timeout vs VCC Reset Timeout vs Temperature Figure5. Figure6. NormalizedVTH vs Temperature VOL vs Current Figure7. Figure8.
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RESET VOLTAGE (mV) VCC (V) 10 k: Pull-Up Resistor SM72240 www.ti.com SNIS154C –JANUARY 2011–REVISED APRIL 2013 TypicalPerformance Characteristics(continued) Low VCC Characteristics Figure9. Timing Diagram Figure10. CIRCUIT INFORMATION RESET OUTPUT The resetinputof a µP initializesthe device intoa known state.The SM72240 microprocessorvoltage monitoringcircuitassertsa forcedresetoutputtopreventcode executionerrorsduringpower-up,power-down, and brownoutconditions. RESET isvalidforVCC ≥ 1V. Once VCC exceeds theresetthreshold,an internaltimermaintainstheoutputfor theresettimeoutperiod.Afterthisinterval,resetgoes highand themicroprocessorinitializesitselfintoa known state.RESET isactivelow. As VCC dropsbelow theresetthreshold(suchas duringa brownout),theresetactivates(seetheNEGATIVE- GOING VCC TRANSIENTS section).When VCC againrisesabove theresetthreshold,theinternaltimerstarts. Reset holdsuntilVCC exceeds theresetthresholdforlongerthantheresettimeoutperiod.Afterthistime,reset releases. Additionally,the Manual Reset input(MR) willinitiatea forcedreset.See the MANUAL RESET INPUT (MR) section. Copyright© 2011–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 5 ProductFolderLinks:SM72240
SNIS154C –JANUARY 2011–REVISED APRIL 2013 www.ti.com The SM72240 resetoutputignoresshortdurationglitcheson VCC and MR. See the ApplicationsInformation sectionfordetails. RESET THRESHOLD The SM72240 isavailablewitha resetvoltageof4.63V or3.08V whicharesuitableformonitoring5.0V or3.3V suppliesrespectively. MANUAL RESET INPUT (MR) Many µP-basedproductsrequirea manual resetcapability,allowingtheoperatortoinitiatea reset.The MR input isfullydebounced and providesan internal22 kΩ pull-up.When theMR inputispulledbelow VIL (0.25VCC )for more than100 ns,resetisassertedaftera typicaldelayof2 µs.Reset remainsactiveas longas MR isheldlow, and releasesafterMR risesabove VIH and theresettimeoutperiodexpires.Use MR withdigitallogictoassert resetortodaisychainsupervisorycircuits. ApplicationsInformation BENEFITS OF PRECISION RESET THRESHOLDS A microprocessorsupplysupervisormust providea resetoutputwithina predictablerangeofthesupplyvoltage. A common thresholdrange isbetween 5% and 10% below the nominalsupplyvoltage.The SM72240 uses highlyaccuratecircuitryto ensure thatthe resetthresholdoccursonlywithinthisrange (for5.0V and 3.3V supplies).Table1 shows how thestandardresetthresholdappliesto5.0Vand 3.3Vnominalsupplyvoltages. Table1.MonitoredToleranceTable Supply Voltage Reset Threshold 3.3V 5.0V 4.63± % 90.8-94.4% 3.08± % 91.8–95.2% ENSURING A VALID RESET OUTPUT DOWN TO VCC = 0V When VCC fallsbelow 1V, the SM72240 RESET outputisunableto sinkthe ratedcurrent.A high-impedance CMOS logicinputconnectedtoRESET can thereforedrifttoundeterminedvoltages.To preventthissituation,a 100kΩ resistorshouldbe connectedfromtheRESET outputtoground,as shown inFigure11. Figure11. CircuitforRESET Validfrom VCC = 0V OPEN DRAIN OUTPUT An open drainoutputallowseasy parallelingofmultiplemicroprocessorresetcircuitswithoutrequiringadditional logicgates.Open drainoutputsalsoallowinterfacingdevicesofdifferinglogiclevelsorfamilies,sincetheoutput pull-upresistormay be connectedtoany supplyvoltageup to5.5V,regardlessofVCC . The pullup resistoriscalculatedso thatmaximum currentflowintoRESET islessthan10 mA when activated. The resistormust be smallenough so thatthe leakagecurrentof allconnecteddevicesdoes not createan excessivevoltagedropwhen theoutputisnotactivated.A resistorvalueof100 kΩ willgenerallysuffice.
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0 20 40 60 80 100 120 140 160 180200 Overdrive (mV) Max Transient Duration (Ps) SM72240 www.ti.com SNIS154C –JANUARY 2011–REVISED APRIL 2013 NEGATIVE-GOING VCC TRANSIENTS The SM72240 isrelativelyimmune toshortnegative-goingtransientsor glitcheson VCC .Figure12 shows the maximum pulsewidtha negative-goingVCC transientcan have withoutcausinga resetpulse.Ingeneral,as the magnitude of the transientincreases,going furtherbelow the threshold,the maximum allowablepulsewidth decreases.Typically,a VCC transientthatgoes 125 mV below theresetthresholdand lasts40 µs orlesswillnot cause a resetpulse.A 0.1 µF bypass capacitormounted as closeas possibleto the VCC pin willprovide additionaltransientrejection. Figure12. Maximum TransientDurationwithoutCausing a Reset Pulse vs.Reset Comparator Overdrive Copyright© 2011–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 7 ProductFolderLinks:SM72240
SNIS154C –JANUARY 2011–REVISED APRIL 2013 www.ti.com
REVISION HISTORY
Changes from RevisionB (April2013)toRevisionC Page
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www.ti.com 13-Sep-2014 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 SM72240MF-3.08/NOPB ACTIVE SOT-23 DBV 5 1000 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 R133 SM72240MF-4.63/NOPB ACTIVE SOT-23 DBV 5 1000 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2240 SM72240MFE-3.08/NOPB ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 R133 SM72240MFE-4.63/NOPB ACTIVE SOT-23 DBV 5 250 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2240 SM72240MFX-3.08/NOPB ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 R133 SM72240MFX-4.63/NOPB ACTIVE SOT-23 DBV 5 3000 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2240 (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) (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.
www.ti.com 13-Sep-2014 Addendum-Page 2 (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.
*All dimensions are nominal Device Package Type Package Drawing Pins SPQ Reel Diameter (mm) Reel Width W1 (mm) (mm) (mm) (mm) (mm) W (mm) Pin1 Quadrant PACKAGE MATERIALS INFORMATION www.ti.com 8-Apr-2013 Pack Materials-Page 1
*All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) SM72240MF-3.08/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0 SM72240MF-4.63/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0 SM72240MFE-3.08/NOPB SOT-23 DBV 5 250 210.0 185.0 35.0 SM72240MFE-4.63/NOPB SOT-23 DBV 5 250 210.0 185.0 35.0 SM72240MFX-3.08/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0 SM72240MFX-4.63/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0 PACKAGE MATERIALS INFORMATION www.ti.com 8-Apr-2013 Pack Materials-Page 2
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