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特性
描述/orderinginformation
SN74ALVCH32973
16-bitbustransceiverandtransparentd-typelatch
WITHEIGHTINDEPENDENTBUFFERS
SCES436C–APRIL2003–REVISEDSEPTEMBER2004
•
获得-upperformanceexceeds250maper
JESD17
•
MemberoftheTexasInstrumentsWidebus+™
家族
•
ESDProtectionExceedsJESD22
•
busholdondatainputseliminatestheneed–2000-vhuman-bodymodel(a114-一个)
forexternalpullup/pulldownresistors
–200-vmachinemodel(a115-一个)
–1000-vcharged-devicemodel(c101)
thisdevicecontainseightindependentnoninvertingbuffersanda16-bitnoninvertingbustransceiverandd-类型
latchdesignedfor1.65-vto3.6-vv
CC
运作.
thesn74alvch32973isparticularlysuitablefordemultiplexinganaddress/databusintoadedicatedaddress
busanddedicateddatabus.thedeviceisusedwherethereisasynchronousbidirectionalcommunication
betweentheaandbdatabus,andtheaddresssignalsarelatchedandbufferedontheqbus.这
控制-functionimplementationminimizesexternaltimingrequirements.
thisdevicecanbeusedasone8-bitbuffer,two8-bittransceivers,andtwo8-bitlatchesorone8-bitbuffer,一个
16-bittransceiver,andone16-bitlatch.itallowsdatatransmissionfromtheabustothebbusorfromthebbus
totheabus,dependingonthelogiclevelatthedirection-控制(dir)输入.thetransceiveroutput-使能
(toe)inputcanbeusedtodisablethetransceiverssothattheaandbbuseseffectivelyareisolated.
whenthelatch-使能(le)inputishigh,theqoutputsfollowthedata(一个)输入.whenleistakenlow,theq
outputsarelatchedatthelevelssetupattheainputs.thelatchoutput-使能(loe)inputcanbeusedtoplace
thenineqoutputsineitheranormallogicstate(highorlowlogiclevel)orthehigh-impedancestate.inthe
高-impedancestate,theqoutputsneitherdrivenorloadthebuslinessignificantly.loedoesnotaffect
internaloperationsofthelatch.olddatacanberetainedornewdatacanbeenteredwhiletheqoutputsarein
thehigh-impedancestate.
toensurethehigh-impedancestateduringpoweruporpowerdown,loeandtoeshouldbetiedtov
CC
throughpullupresistors;theminimumvaluesoftheresistorsaredeterminedbythecurrent-sinkingcapabilityof
thedrivers.
TheeightindependentnoninvertingbuffersperformtheBooleanfunctionY=Dandareindependentofthestate
ofdir,toe,le,andloe.
theaandbi/osanddinputshavebus-holdcircuitry.activebus-holdcircuitryholdsunusedorundrivendata
inputsatavalidlogicstate.useofpulluporpulldownresistorswiththebus-holdcircuitryisnotrecommended.
ORDERINGINFORMATION
T
一个
包装
(1)
orderablepartnumbertop-sidemarking
lfbga-gkesn74alvch32973kr
-40
°
Cto85
°
CTapeandreelACH973
lfbga-zke(铅-自由)74alvch32973zker
(1)packagedrawings,standardpackingquantities,thermaldata,符号化,andpcbdesignguidelinesareavailableat
www.德州仪器.com/sc/包装.
pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsoftexas
instrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
widebus+isatrademarkoftexasinstruments.
productiondatainformationiscurrentasofpublicationdate.
copyright©2003–2004,texasinstrumentsincorporated
ProductsconformtospecificationsperthetermsoftheTexas
instrumentsstandardwarranty.productionprocessingdoesnot
necessarilyincludetestingofallparameters.
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