Choosing an Appropriate Pull-up/Pull-down …
ApplicationReportSLVA485 October2011ChoosinganAppropriatePull- :opendrain(opencollectorforbipolaroutput s)orpush- pull (alsoknownastotempole). , ,opendrainoutputsprovidemoreflexibilityt oadesignerastheycanbepulled-uptoanyvolta gefoundinthesystem,whichcanbeusefulwhent heyserveasinputstoa processorwhichmightrequirea (PG)andLowBattery(LBO)onswitchingregulat ors,resetandPowerFail(PFO)onsupplyvoltag esupervisors(SVS),andLowBattery,PowerFai l, pull -uporpull-downresistor,thefactorstha tshouldbeconsideredwhenselectinga pull -uporpull-downresistor,andhowtocalcu latea (PGFloatingHigh)........................ .....................................22T ypicalPGOutputEquivalentCircuit(PGLow).. ........................................ ..............................33ResetOut putEquivalentCircuit(ResetFloatingLow).. ........................................ .......................54ResetOutputEqui valentCircuit(ResetHigh)................ ........................................ ................... October2011ChoosinganAppropriatePull-up/ pull -downResistorforOpenDrainOutputsSubm itDocumentationFeedbackCopyright 2011,TexasInstrumentsIncorporated_+Compa ratorILKGQ1 (OFF)PGVPGIPull-upRPull-upENIENVOUTInsid e the criticalvoltagewithina systemandoutputsa resetsignalif theopendrainoutputin needofa somevoltagein powerconverter,a PGoutputis routinelyusedtodrivetheenableinputofa PGoutputis lowif thechip s outputvoltageis belowa theLBIpinvoltagedropsbelowa whethera pull -upora pull -do
Application Report SLVA485–October 2011 Choosing an Appropriate Pull-up/Pull-downResistor for Open Drain Outputs Ben Hopf..... PMP-DC/DCLow-PowerConverters
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