HI-8787,hi-8788 description features pinconfiguration theHI-8787andhi-8788aresystemcomponentsfor interfacing16bitparalleldatatoanarinc429bus.they combinelogicandlinedriverononechip.theHI-8787has anoutputresistanceof37.5ohms,andthehi-8788has outputresistanceof10ohmstofacilitateexternallightning protectioncircuitry. thetechnologyisanalog/digital cmos. bothproductsofferhighspeeddatabustransactionsintoa bufferregister.afterloading216-bitwords,datais automaticallytransferredandtransmitted.thedatarateis equaltotheclockrate.paritycanbeenabledinthe32nd bit.resetisusedtoinitializethelogicuponstartup.word gapsareautomaticallysent. thepartrequires+/-10voltsuppliesinadditiontoa5volt supply. automaticallyconverts16bitparalleldata toarinc429or561data highspeeddatabusinterface on-chiplinedriver availableinsmalltqfppackage militaryprocessingoptions l l l l l 32-pinplastictqfppackage january2001 (ds8787rev.b)01/01 24-txbout 23-txaout 22-v- 21-parityenb 20-xmtrdy 19-xmitclk 18- 17- reset write d4-1 n/c-2 d5-3 d6-4 d7-5 d8-6 d9-7 d10-8 HI-8787pqi HI-8787pqt hi-8788pqi & hi-8788pqt holtintegratedcircuits 1
HI-8787,hi-8788 pindescriptions functionaldescription pinsymbolfunctiondescription 28561syncdigitaloutputarinc561syncsignal 1,3-10,13-15,29-32dndigitalinputsparallel16bitbusinput 11gndpowersupplyground 12a0digitalinputloadaddress,a0=0for1stdataload,a0=1for2nddataload 16slp1.5digitalinputselectstheslopeofthelinedriver.high=1.5us 17digitalinputwritestrobe.loadsdataonrisingedge. 18digitalinputregistersandsequencinglogicinitializedwhenlow 19xmitclkdigitalinputclockinputforthetransmitter 20xmtrdydigitaloutputgoeshighifthebufferregisterisempty 21parityenbdigitalinputwhenhighthe32ndbitoutputi soddparity 22v-powersupply-10voltrail 23txaoutanalogoutputlinedriveroutput-aside 24txboutanalogoutputlinedriveroutput-bside 25561datadigitaloutputserialoutputforarinc561data 26v+powersupply+10voltrail 27vccpowersupply+5voltrail,?one?leveloutoflinedriver,invertedfor?zero? write reset theHI-8787isaparalleltoserialconverter,whichwhen loadedwithtwo16bitparallelwords,outputsthedataasa 32bitserialword.timingcircuitryinsertsa4bitgapatthe endofeach32bitword.aninputbufferregisterallowsload operationstotakeplacewhilethepreviouslyloadedword isbeingtransmitted. iftheparityenbpinishigh,the32ndbitwillbeaparity bit,insertedsoastomakethe32bitwordhaveoddparity.if theparityenbpinislow,the32ndbitwillbethed15bit ofthe2ndwordloaded. outputsareprovidedforbotharinc429(txaoutand txboutpins),andarinc561(561da taand561sync pins)typedata. alowsignalappliedtothepinresetstheHI-8787?s internallogicsothatspurioustransmissiondoesnottake placeduringpower-up.theregistersareclearedsothata continuousgapwillbetransmitteduntilthefirstwordis loadedintothetransmitter. thexmitclkfrequencyisthesameasthedatarate. reset inputdatacanbeloadedwhenthexmtrdysignalis high,whichindicatestheinputbufferregisterisempty.the first16bitwordisloadedwiththea0inputhigh.thesec- ondwordisloadedwitha0inthelowstate.eachdataword isloadedintotheinputbufferregisterbyalowpulseonthe input.(seefigure1).afterthesecondwordhas beenloaded,thexmtrdyoutputgoeslow.thecontents oftheinputbufferregisteraretransferredtotheoutputreg- isterduringthefourthbitperiodofthegap.ifthefourthgap bitperiodofthepreviouswordhasalreadybeentransmit- ted,thecontentsoftheinp utbufferregisterwillbetrans- ferredtotheoutputshiftregisterduringthefirstbitperiodaf- tertheseconddataload,andthexmtrdyoutputgoes high. aftertheoutputshiftregisterisloaded,thedataisshifted outtotheoutputlogicintheordershowninfigure2. write the561syncoutputpulseslowwhenthexmitclkis lowduringthe8thbitofthearinctransmission. holtintegratedcircuits 2 holtintegratedcircuits 2
a0loaddatabusarincbits 1word1d0-d15arinc1-arinc16 0word2d0-d15arinc17-arinc32 figure2.orderoftransmitteddata figure1.blockdiagram data bus 16to32bit mux 32bit buffer register 32bit shift register write a0 16 32 32 status& control logic xmtrdy xmitclk wordgap counter bit counter output logic line driver parityenb 561data 561sync txbout txaout slp1.5 functionaldescription(cont.) theHI-8787andhi-8788haveanon-chiplinedriverde- signedtodirectlydrivethearinc429bus.thetwoarinc outputs(txaoutandtxbout)provideadifferentialvolt- agetoproducea+10voltone,a-10voltzero,anda0volt null.theslopeofthearincoutputsiscontrolledbythe slp1.5pin.ifslp1.5ishigh,theoutputriseandfalltimeis nominally1.5s..ifslp1.5issetlow,theriseandfalltimes are10s. theHI-8787has37.5ohmsinserieswitheachlinedriver output.thehi-8788has10.0ohmsinseries.thehi-8788 isforapplicationswhereexternalseriesresistanceis needed,typical lyforlightningprotectiondevices. m m holtintegratedcircuits 3
xmitclk 353612345313233343536 561data 561sync lowduringclk8 arinc429data (txaout-txbout) phlx t phlx t plhx t plhx t 0v 10v -10v rx t t fx t 10% 90% t t 10% 90% t rx t 10% fx xmtclk holtintegratedcircuits 4
parametersymbolconditionmintypmaxunits operatingvoltagev4.7555.25v min.inputvoltage(hi)v2.01.4v max.inputvoltage(lo)v1.40.7v min.inputcurrent(hi)iv=4.9v280a max.inputcurrent(lo)iv=0.1v-1a min.outputvoltage(hi)vi=-1.6ma2.7v max.outputvoltage(lo)vi=1.6ma0.4v operatingcurrentdrainif=100khz0.82.8ma inputcapacitancecnottested20pf cc cc operatingvoltagev+9.51010.5v operatingvoltagev--9.5-1010.5v linedriveroutputlevels(ref.tognd) onenoload,vcc=5.0v4.55.05.5v null?-0.2500.25v zero-5.5-5.0-4.5v linedriveroutputlevels (differentialtxaout-txbout) onenoload,vcc=5.0v9.010.011.0v null?-0.500.5v zero?-11.0-10.0-9.0v minimumshortcircuitsinkorsourcecurrentimomentarymagnitude80ma operatingcurrentdrain(v+)if=100khz620ma operatingcurrentdrain(v-)if=100khz-20-6ma ih il ihih ilil ohout ihout in out dd ee note:stressesaboveabsolutemaximum ratingsoroutsiderecommendedoperating conditionsmaycausepermanentdamagetothe device.thesearestressratingsonly.operation atthelimitsisnotrecommended. voltagesreferencedtoground supplyvoltages v+.................................................12.5v v-.................................................-12.5v dccurrentperinputpin................+10ma powerdissipationat25 plasticdil............1.0w,derate10mw/c ceramicdil..........0.5w,derate7mw/c soldertemperature........275cfor10sec storagetemperature........-65cto+150c vcc..................................................7v absolutemaximumratings recommendedoperatingconditions supplyvoltages v+.......................................+10v...5% v-........................................-10v...5% temperaturerange industrialscreening.........-40cto+85c hi-tempscreening........-55cto+125c militaryscreening..........-55cto+125c vcc.......................................5v...5% vcc=5.0v,v=0v,v+=10v,v-=-10v,t=operatingtemperaturerange(unlessotherwisespecified). ssa holtintegratedcircuits 5
parametersymboltestconditionsmintypmaxunits t20 t t t t t setupdatabustons hold0ns holda0to0ns pulsewidth40ns pulsewidtha040ns delaylast40ns linedriverpropagationdelaynoload outputhightolowtphlx-500-ns outputlowtohightplhx-500-ns linedrivertransitiontimes outputhightolowtfxslp1.5=logic11.01.52.0s outputlowtohightrxslp1.5=logic11.01.52.0s outputhightolowtfxslp1.5=logic051015s outputlowtohightrxslp1.5=logic051015s databustiming linedrivertiming write set todatabus toxmtrdy write write write write hld ah wpw apw xd m m m m vcc=5.0v,v+=10v,v-=-10v,v=0v,t=operatingtemperaturerange(unlessotherwisespecified). ssa orderinginformation HI-8787pqiyes37.5ohm32pinplastictqfp-40cto+85cisolder HI-8787pqtyes37.5ohm32pinplastictqfp-55cto+125ctsolder hi-8788pqiyes10.0ohm32pinplastictqfp-40cto+85cisolder hi-8788pqtyes10.0ohm32pinplastictqfp-55cto+125ctsolder holtintegratedcircuits 6
.3543bsc (9.00bsc ) sq. .063max. (1.60max. ) .0315bsc (0.80bsc ) .0148.0030 (0.375 ) .075 .0551.002 (1.4 .05) .0031rmin. (0.08rmin. ) .0039.002 (0.10 ) .05 07 q .2755bsc (7.00bsc ) sq. seedetaila detaila .0055r.0024 (0.14r ) .06 .0236.0059 (0.60 ) .15 HI-8787,hi-8788packagedimensions inches(millimeters) holtintegratedcircuits 7 packagetype: 32ptqs 32pinplasticthinquadflatpack(tqfp) .00057.00022 (0.0145 ) .0055
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