Texas Instruments TMS320DM355 Computer Hardware User Manual


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PRODUCT PREVIEW
5PeripheralInformationandElectricalSpecifications
5.1ParameterInformationDevice-SpecificInformation
TransmissionLine
4.0pF 1.85pF
Z0=50Ω
(seenote)
Tester PinElectronics
Data SheetTimingReferencePoint
Output
Under
Test
42 Ω 3.5nH
DevicePin
(seenote)
5.1.1SignalTransitionLevels
V
ref
V
ref
=V
IL
MAX(orV
OL
MAX)
V
ref
=V
IH
MIN(orV
OH
MIN)
TMS320DM355
DigitalMediaSystem-on-Chip(DMSoC)
SPRS463A–SEPTEMBER2007–REVISEDSEPTEMBER2007
A.Thedatasheetprovidestimingatthedevicepin.Foroutputtiminganalysis,thetesterpinelectronicsandits
transmissionlineeffectsmustbetakenintoaccount.Atransmissionlinewithadelayof2nsorlongercanbeusedto
producethedesiredtransmissionlineeffect.Thetransmissionlineisintendedasaloadonly.Itisnotnecessaryto
addorsubtractthetransmissionlinedelay(2nsorlonger)fromthedatasheettimings.
Inputrequirementsinthisdatasheetaretestedwithaninputslewrateof<4Voltspernanosecond(4V/ns)atthe
devicepin.
Figure5-1.TestLoadCircuitforACTimingMeasurements
TheloadcapacitancevaluestatedisonlyforcharacterizationandmeasurementofACtimingsignals.This
loadcapacitancevaluedoesnotindicatethemaximumloadthedeviceiscapableofdriving.
AllinputandoutputtimingparametersarereferencedtoV
ref
forboth"0"and"1"logiclevels.For3.3VI/O,
V
ref
=1.65V.For1.8VI/O,V
ref
=0.9V.
Figure5-2.InputandOutputVoltageReferenceLevelsforACTimingMeasurements
AllriseandfalltransitiontimingparametersarereferencedtoV
IL
MAXandV
IH
MINforinputclocks,
V
OL
MAXandV
OH
MINforoutputclocks.
Figure5-3.RiseandFallTransitionTimeVoltageReferenceLevels
94PeripheralInformationandElectricalSpecificationsSubmitDocumentationFeedback
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