Datasheet

I
2
CINTERFACETIMINGREQUIREMENTS
SWITCHINGCHARACTERISTICS
PCA9555
www.ti.com .........................................................................................................................................................SCPS131E–AUGUST2005–REVISEDMAY2008
overrecommendedoperatingfree-airtemperaturerange(unlessotherwisenoted)(seeFigure11)
MINMAXUNIT
f
scl
I
2
Cclockfrequency0400kHz
t
sch
I
2
Cclockhightime0.6µs
t
scl
I
2
Cclocklowtime1.3µs
t
sp
I
2
Cspiketime50ns
t
sds
I
2
Cserial-datasetuptime100ns
t
sdh
I
2
Cserial-dataholdtime0ns
t
icr
I
2
Cinputrisetime20+0.1C
b
(1)
300ns
t
icf
I
2
Cinputfalltime20+0.1C
b
(1)
300ns
t
ocf
I
2
Coutputfalltime10-pFto400-pFbus20+0.1C
b
(1)
300ns
t
buf
I
2
CbusfreetimebetweenStopandStart1.3µs
t
sts
I
2
CStartorrepeatedStartconditionsetup0.6µs
t
sth
I
2
CStartorrepeatedStartconditionhold0.6µs
t
sps
I
2
CStopconditionsetup0.6µs
t
vd(Data)
Valid-datatimeSCLlowtoSDAoutputvalid50ns
t
vd(ack)
Valid-datatimeofACKconditionACKsignalfromSCLlowtoSDA(out)low0.10.9µs
C
b
I
2
Cbuscapacitiveload400pF
(1)C
b
=totalcapacitanceofonebuslineinpF
overrecommendedoperatingfree-airtemperaturerange,C
L
≤100pF(unlessotherwisenoted)(seeFigure12andFigure13)
FROMTO
PARAMETERMINMAXUNIT
(INPUT)(OUTPUT)
t
iv
InterruptvalidtimePportINT4µs
t
ir
InterruptresetdelaytimeSCLINT4µs
t
pv
OutputdatavalidSCLPport200ns
t
ps
InputdatasetuptimePportSCL150ns
t
ph
InputdataholdtimePportSCL1µs
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Not Recommended for New Designs