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4.5ParameterInformation
4.5.1ParameterInformationDevice-SpecificInformation
Transmission Line
4.0 pF 1.85 pF
Z0 = 50 Ω
(see note)
Tester Pin Electronics
Data Sheet Timing Reference Point
Output
Under
Test
42 Ω 3.5 nH
Device Pin
(see note)
V
ref
= 1.5 V
V
ref
= V
IL
MAX (or V
OL
MAX)
V
ref
= V
IH
MIN (or V
OH
MIN)
TMS320C6727,TMS320C6726,TMS320C6722
Floating-PointDigitalSignalProcessors
SPRS268E–MAY2005–REVISEDJANUARY2007
A.Thedatasheetprovidestimingatthedevicepin.Foroutputtiminganalysis,thetesterpinelectronicsandits
transmissionlineeffectsmustbetakenintoaccount.Atransmissionlinewithadelayof2nsorlongercanbeusedto
producethedesiredtransmissionlineeffect.Thetransmissionlineisintendedasaloadonly.Itisnotneccessaryto
addorsubtractthetransmissionlinedelay(2nsorlonger)fromthedatasheettimings.
Inputrequirementsinthisdatasheetaretestedwithaninputslewrateof<4Voltspernanosecond(4V/ns)atthe
devicepin.
Figure4-1.TestLoadCircuitforACTimingMeasurements
4.5.1.1SignalTransitionLevels
Allinputandoutputtimingparametersarereferencedto1.5Vforboth"0"and"1"logiclevels.
Figure4-2.InputandOutputVoltageReferenceLevelsforACTimingMeasurements
AllriseandfalltransitiontimingparametersarereferencedtoV
IL
MAXandV
IH
MINforinputclocks,
V
OL
MAXandV
OH
MINforoutputclocks.
Figure4-3.RiseandFallTransitionTimeVoltageReferenceLevels
4.5.1.2SignalTransitionRates
Alltimingsaretestedwithaninputedgerateof4Voltspernanosecond(4V/ns).
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