參數(shù)資料
型號： TSPC750AVGSU8LE
英文描述： Microprocessor
中文描述： 微處理器
文件頁數(shù)： 33/44頁
文件大?。?/td> 870K
代理商： TSPC750AVGSU8LE
33
TSPC750A/740A
2128A–HIREL–01/02
Thesecapacitorsshouldvaryinvaluefrom220pFto10μFtoprovidebothhigh-and
low-frequencyfiltering,andshouldbeplacedascloseaspossibletotheirassociated
V
DD
orOV
DD
pins.SuggestedvaluesfortheV
DD
pins-220pF(ceramic),0.01μF
(ceramic),and0.1μF(ceramic).SuggestedvaluesfortheOV
DD
pins—0.01μF
(ceramic),0.1μF(ceramic),and10μF(tantalum).OnlySMT(surfacemounttechnol-
ogy)capacitorsshouldbeusedtominimizeleadinductance.
Inaddition,itisrecommendedthattherebeseveralbulkstoragecapacitorsdistributed
aroundthePCB,feedingtheV
DD
andOV
DD
planes,toenablequickrechargingofthe
smallerchipcapacitors.ThesebulkcapacitorsshouldhavealowESR(equivalent
seriesresistance)ratingtoensurethequickresponsetimenecessary.Theyshouldalso
beconnectedtothepowerandgroundplanesthroughtwoviastominimizeinductance.
Suggestedbulkcapacitors-100μF(AVXTPStantalum)or330μF(AVXTPStantalum).
Connection
Recommendations
Toensurereliableoperation,itishighlyrecommendedtoconnectunusedinputstoan
appropriatesignallevel.UnusedactivelowinputsshouldbetiedtoV
DD
.Unusedactive
highinputsshouldbeconnectedtoGND.AllNC(no-connect)signalsmustremain
unconnected.
PowerandgroundconnectionsmustbemadetoallexternalV
DD
,OV
DD
,andGNDpins
oftheTSPC750A.
Externalclockroutingshouldensurethattherising-edgeoftheL2clockiscoincidentat
theCLKinputofallSRAMsandattheL2SYNC_INinputoftheTSPC750A.The
L2CLKOUTAnetworkcouldbeusedonly,ortheL2CLKOUTBnetworkcouldalsobe
useddependingontheloading,frequency,andnumberofSRAMs.
OutputBufferDC
Impedance
TheTSPC750A60xandL2I/Odriverswerecharacterizedoverprocess,voltage,and
temperature.TomeasureZ
0
,anexternalresistorisconnectedtothechippad,eitherto
OV
DD
orOGND.Then,thevalueofsuchresistorisvarieduntilthepadvoltageis
OV
DD
/2;seeFigure22.
Theoutputimpedanceisactuallytheaverageoftwocomponents,theresistancesofthe
pull-upandpull-downdevices.WhenDataisheldlow,SW1isclosed(SW2isopen),
andR
N
istrimmeduntilPad = OV
DD
/2.R
N
thenbecomestheresistanceofthepull-down
devices.WhenDataisheldhigh,SW2isclosed(SW1isopen),andR
P
istrimmeduntil
Pad=OV
DD
/2.R
P
thenbecomestheresistanceofthepull-updevices.Withaproperly
designeddriverR
P
andR
N
areclosetoeachotherinvalue.ThenZ
0
=(R
P
+R
N
)/2.
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