Datasheet

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8.5.4Pin-RelatedCharacteristicsoftheSDAandSCLI/OStagesforF/S-ModeI
2
C-BusDevices
TAS3108,TAS3108IA
AUDIODIGITALSIGNALPROCESSORS
SLES152B–OCTOBER2005–REVISEDNOVEMBER2007
STANDARDMODEFASTMODE
PARAMETERTESTCONDITIONSUNIT
MINMAXMINMAX
V
IL
LOW-levelinputvoltage–0.5
(1)
0.8–0.5
(1)
0.8V
V
IH
HIGH-levelinputvoltage22V
V
hys
HysteresisofinputsN/AN/A0.05V
DD
(1)
V
LOW-leveloutputvoltage(opendrainor
V
OL1
3-mAsinkcurrent00.4
(1)
V
opencollector)
Buscapacitancefrom10pF7+0.1C
b
t
of
OutputfalltimefromV
IHmin
to
VILmax
250
(1)
250
(1)
ns
to400pF
(2)(1)
I
I
Inputcurrent,eachI/Opin–1010–10
(3)
10
(3)
µA
SCLpulsedurationofspikesthatmust
t
SP(SCL)
N/AN/A14
(4)(1)
ns
besuppressedbytheinputfilter
SDApulsedurationofspikesthatmust
t
SP(SDA)
N/AN/A22
(4)(1)
ns
besuppressedbytheinputfilter
C
I
Capacitance,eachI/Opin10
(1)
10
(1)
pF
(1)Thismeasurementinspecifiedbydesign.
(2)C
b
=capacitanceofonebuslineinpF.TheoutputfalltimeisfasterthanthestandardI
2
Cspecification.
(3)TheI/Opinsoffast-modedevicesmustnotobstructtheSDAandSDLlinesifV
DD
isswitchedoff.
(4)Thesevaluesarevalidatthe135-MHzDSPclockrate.IfDSPclockisreducedbyonehalf,thet
SP
doubles.
NOTE
SDAdoesnothavethestandardI
2
Cspecification300-nsinternalholdtime.SDAmustbe
validbytherisingandfallingedgesofSCL.
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