VoltageDetector
Features
·Lowpowerconsumption·Lowtemperaturecoefficient
·Built-inhigh-stabilityreferencesource
·Built-inhysteresischaracteristic·TO-92&SOT-89package
Applications
·Batterycheckers·Levelselectors·Powerfailuredetectors
·Microcomputerreset·Batterymemorybackup
·Non-volatileRAMsignalstorageprotectors
GeneralDescription
TheHT70XXseriesisasetofthree-terminallowpowervoltagedetectorsimplementedinCMOStechnology.Eachvoltagedetectorintheseriesdetectsaparticularfixedvoltagerangingfrom2.2Vto7V.Thevoltagede-tectorsconsistofahigh-precisionandlowpowercon-sumptionstandardvoltagesource,acomparator,hysteresiscircuit,andanoutputdriver.CMOStechnol-ogyensureslowpowerconsumption.
Althoughdesignedprimarilyasfixedvoltagedetectors,thesedevicescanbeusedwithexternalcomponentstodetectuserspecifiedthresholdvoltages(NMOSopendraintypeonly).
SelectionTable
PartNo.HT7022AHT7024AHT7027AHT7033AHT7039AHT7044AHT7050AHT7070ANote:
DetectableVoltage
2.2V2.4V2.7V3.3V3.9V4.4V5.0V7.0V
HysteresisWidth
0.11V0.12V0.135V0.165V0.195V0.22V0.25V0.35V
Tolerance±5%±5%±5%±5%±5%±5%±5%±5%
Theoutputtypeselectioncodesare:NMOSopendrainnormalopen,activelow
Forexample:TheHT7070Aisa7.0V,NMOSopendrainactivelowoutput
Outputtypeselectiontable
VDD
Type
VOUTA
VDD>VDET(+)
Hi-Z
VDD£VDET(-)
VSS
Rev.1.601January14,2003
HT70XX
BlockDiagram
Nchannelopendrainoutput(normalopen;activelow)
VDDVOUTVREFGNDAtype
VOUTVDETVHYSVINPinAssignment
Rev.1.602January14,2003
HT70XXPadAssignment
HT70XX(exceptHT7022A)
PadCoordinates
HT70XX(exceptHT7022A)
PadNo.
1
Unit:mmY-379.50-399.50-386.00
Unit:mm
X-483.30-234.60443.90
23
HT7022Aonly
PadNo.
1
X-434.34120.65774.70
Y
Chipsize:1317´1158(mm)2
*TheICsubstrateshouldbeconnectedtoVDDinthePCBlayoutartwork.HT7022Aonly
394.97461.01412.75
23
Chipsize:2032´1321(mm)2
*TheICsubstrateshouldbeconnectedtoVDDinthePCBlayoutartwork.
AbsoluteMaximumRatings
SupplyVoltage,exceptHT7022A..................................................................................................VSS-0.3VtoVSS+26VSupplyVoltage,HT7022Aonly....................................................................................................................-0.3Vto13VOutputVoltage...........................VSS-0.3VtoVDD+0.3VStorageTemperature............................-50°Cto125°COperatingTemperature...............................0°Cto70°C
Note:Thesearestressratingsonly.Stressesexceedingtherangespecifiedunder²AbsoluteMaximumRatings²may
causesubstantialdamagetothedevice.Functionaloperationofthisdeviceatotherconditionsbeyondthoselistedinthespecificationisnotimpliedandprolongedexposuretoextremeconditionsmayaffectdevicereliabil-ity.
OutputCurrent......................................................50mAPowerConsumption..........................................200mW
Rev.1.603January14,2003
HT70XX
ElectricalCharacteristics
HT7022ASymbolParameterHi®LoDetectableVoltageLo®HiDetectableVoltageHysteresisWidthOperatingCurrentOperatingVoltageOutputSinkCurrentTemperatureCoefficientTestConditionsVDD¾¾¾3.2V¾2V¾Conditions¾¾¾Noload¾VOUT=0.2V0°C HT7033ASymbolParameterHi®LoDetectableVoltageLo®HiDetectableVoltageHysteresisWidthOperatingCurrentOperatingVoltageOutputSinkCurrentTemperatureCoefficientTestConditionsVDD¾¾¾8V¾2.5V¾Conditions¾¾¾Noload¾VOUT=0.25V0°C HT7050ASymbolParameterHi®LoDetectableVoltageLo®HiDetectableVoltageHysteresisWidthOperatingCurrentOperatingVoltageOutputSinkCurrentTemperatureCoefficientTestConditionsVDD¾¾¾8V¾3.6V¾Noload¾VOUT=0.36V0°C Whenthevoltagedroptothepositiveinputofthecom-parator(i,e,VB)ishigherthanVREF,VOUTgoeshigh,M1turnsoff,andVBisexpressedasVBH=VDD´(RB+RC)/(RA+RB+RC).IfVDDisdecreasedsothatVBfallstoavaluelessthanVREF,thecomparatoroutputin-vertsfromhightolow,VOUTgoeslow,VCishigh,M1turnson,RCisbypassed,andVBbecomes:VBL=VDD´RB/(RA+RB),whichislessthanVBH.Bysodoing,thecomparatoroutputwillstaylowtopreventthecircuitfromoscillatingwhenVB»VREF. IfVDDfallsbelowtheminimumoperatingvoltage,theoutputbecomesundefined.WhenVDDgoesfromlowtoVDD´RB/(RA+RB)>VREF,thecomparatoroutputandVOUTgoeshigh. Thedetectablevoltageisdefinedas:VDET(-)= RA+RB+RC ´VREF RB+RCRA+RB ´VREF RB Thereleasevoltageisdefinedas:VDET(+)= Rev.1.606January14,2003 HT70XX Thehysteresiswidthis:VHYS=VDET(+)-VDET(-) ThefiguredemonstratestheNMOSoutputtypewithpositiveoutputpolarity(VOUTisnormallyopen,activelow).TheHT70XXseriesalsosuppliesoptionsforotheroutputtypeswithactivehighoutputs.Applicationcir-cuitsshownareexamplesofpositiveoutputpolarity(normallyopen,activelow)unlessotherwisespecified. NMOSoutputvoltagedetector(HT70XXA) ApplicationCircuits Microcomputerresetcircuit Normallyaresetcircuitisrequiredtoprotectthemicro-computersystemfrommalfunctionsduetopowerlineinterruptions.Thefollowingexamplesshowhowdiffer-entoutputconfigurationsperformaresetfunctioninvar-ioussystems. ·NMOSopendrainoutputapplicationforseparate Power-onresetcircuit Withseveralexternalcomponents,theNMOSopendraintypeoftheHT70XXseriescanbeusedtoperformapower-onresetfunctionasshown: powersupply ·NMOSopendrainoutputapplicationwithR-Cdelay Rev.1.607January14,2003 HT70XX 5Vpowerlinemonitoringcircuit Generally,aminimumoperatingvoltageof4.5Visguar-anteedina5Vpowerlinesystem.TheHT7044Aisrec-ommendedforuseas5Vpowerlinemonitoringcircuit. ·5Vpowerlinemonitorwithpower-onreset·Varyingthedetectablevoltagewithadiode DetectableVoltage=Vf1+Vf2+VDET Malfunctionanalysis Thefollowingcircuitdemonstratesthewayacircuitana-lyzesmalfunctionsbymonitoringthevariationorspikenoiseofpowersupplyvoltage. ·with5Vvoltageregulator Chargemonitoringcircuit Thefollowingcircuitshowsachargedmonitorforpro-tectionagainstbatterydeteriorationbyovercharging.Whenthevoltageofthebatteryishigherthanthesetde-tectablevoltage,thetransistorturnsontobypassthechargecurrent,protectingthebatteryfromovercharg-ing. Changeofdetectablevoltage Iftherequiredvoltageisnotfoundinthestandardprod-uctselectiontable,itispossibletochangeitbyusingex-ternalresistancedividersordiodes. ·Varyingthedetectablevoltagewitharesistancedi- vider RA+RB ´VDET RB RA+RB Hysteresiswidth=´VHYS RBDetectablevoltage= Rev.1.608January14,2003 HT70XX Levelselector Thefollowingdiagramillustratesalogiclevelselector. Rev.1.609January14,2003 HT70XX PackageInformation 3-pinTO-92outlinedimensions SymbolABCDEFGHIa Dimensionsinmil Min.1701705001190454513084° Nom.¾¾¾¾¾¾¾¾¾¾ Max.200200¾201105565160186° Rev.1.6010January14,2003 HT70XX 3-pinSOT-89outlinedimensions SymbolABCDEFGHIJ Dimensionsinmil Min.1736490351551417¾5514 Nom.¾¾¾¾¾¾¾59¾¾ Max.18172102471671922¾6317 Rev.1.6011January14,2003 HT70XX ProductTapeandReelSpecifications TO-92reeldimensions(Unit:mm) Rev.1.6012January14,2003 HT70XX SOT-89reeldimensions SOT-89 SymbolABCDT1T2 Description ReelOuterDiameterReelInnerDiameterSpindleHoleDiameterKeySlitWidth SpaceBetweenFlangeReelThickness Dimensionsinmm 180±1.062±1.512.75+0.151.9±0.1512.4+0.217-0.4 Rev.1.6013January14,2003 HT70XX TO-92carriertapedimensions TO-92 SymbolI1PP0P2F1F2DhWW0W1W2H0H1D0tH Note: Description TapedLeadLengthComponentPitchPerforationPitch ComponenttoPerforation(LengthDirection)LeadSpreadLeadSpread ComponentAlignmentCarrierTapeWidthHold-downTapeWidthPerforationPositionHold-downTapePositionLeadClinchHeightComponentHeightPerforationDiameterTapedLeadThicknessComponentBaseHeight Dimensionsinmm (2.5)12.7±1.012.7±0.36.35±0.42.5+0.4 -0.12.5+0.4 -0.10±0.118.0+1.0 -0.56.0±0.59.0±0.5(0.5)16.0±0.5Lessthan24.7 4.0±0.20.7±0.219.0±0.5 Thicknesslessthan0.38±0.05mm~0.5mmP0Accumulatedpitchtolerance:±1mm/20pitches.()Bracketedfiguresareforconsultationonly Rev.1.6014January14,2003 HT70XX SOT-89carriertapedimensions SOT-89 SymbolWPEFDD1P0P1A0B0K0tC Description CarrierTapeWidthCavityPitchPerforationPosition CavitytoPerforation(WidthDirection)PerforationDiameterCavityHoleDiameterPerforationPitch CavitytoPerforation(LengthDirection)CavityLengthCavityWidthCavityDepth CarrierTapeThicknessCoverTapeWidth Dimensionsinmm 12.0+0.3 -0.18.0±0.11.75±0.15.5±0.051.5+0.11.5+0.14.0±0.12.0±0.104.8±0.14.5±0.11.8±0.10.30±0.013 9.3 Rev.1.6015January14,2003 HT70XX HoltekSemiconductorInc.(Headquarters) No.3,CreationRd.II,Science-basedIndustrialPark,Hsinchu,TaiwanTel:886-3-563-1999Fax:886-3-563-1189http://www.holtek.com.tw HoltekSemiconductorInc.(SalesOffice) 11F,No.576,Sec.7ChungHsiaoE.Rd.,Taipei,TaiwanTel:886-2-2782-9635Fax:886-2-2782-9636 Fax:886-2-2782-7128(Internationalsaleshotline) HoltekSemiconductor(Shanghai)Inc. 7thFloor,Building2,No.889,YiShanRd.,Shanghai,ChinaTel:021-6485-5560Fax:021-6485-0313 http://www.holtek.com.cn HoltekSemiconductor(HongKong)Ltd. RM.711,Tower2,CheungShaWanPlaza,833CheungShaWanRd.,Kowloon,HongKongTel:852-2-745-8288Fax:852-2-742-8657 HolmateSemiconductor,Inc. 48531WarmSpringsBoulevard,Suite413,Fremont,CA94539Tel:510-252-9880Fax:510-252-9885 http://www.holmate.com CopyrightÓ2003byHOLTEKSEMICONDUCTORINC. TheinformationappearinginthisDataSheetisbelievedtobeaccurateatthetimeofpublication.However,Holtekas-sumesnoresponsibilityarisingfromtheuseofthespecificationsdescribed.TheapplicationsmentionedhereinareusedsolelyforthepurposeofillustrationandHoltekmakesnowarrantyorrepresentationthatsuchapplicationswillbesuitablewithoutfurthermodification,norrecommendstheuseofitsproductsforapplicationthatmaypresentarisktohumanlifeduetomalfunctionorotherwise.Holtekreservestherighttoalteritsproductswithoutpriornotification.Forthemostup-to-dateinformation,pleasevisitourwebsiteathttp://www.holtek.com.tw. Rev.1.6016January14,2003 因篇幅问题不能全部显示，请点此查看更多更全内容