Datasheet

A
A
A
A
S 0 1 0 0
A1
A2 A0
1
Data 1 1
P
Data 3
Start
Condition
16 Bits
(Two Data Bytes)
From Port
Data From PortSlave Address (PCA9555)
R/W
87654321
t
i
r
t
i
r
t
s
ps
t
i
v
Address Data 1 Data 3
INT
Data
Into
Port
B
B
A
A
Pn
INT
R/W A
t
i
r
0.7 ×
V
CC
0.3 × V
CC
0.7 × V
CC
0.3 × V
CC
0.7 × V
CC
0.3 × V
CC
0.7 × V
CC
0.3 × V
CC
INT
SCL
View B−BView A−A
t
i
v
R
L
= 4.7 k
Ω
V
C
C
C
L
= 100 pF
INTERRUPT LOAD CONFIGURATION
DUT
INT
ACK
From Slave
ACK
From Slave
Data 2
Data 2
PCA9555
www.ti.com .........................................................................................................................................................SCPS131E–AUGUST2005–REVISEDMAY2008
PARAMETERMEASUREMENTINFORMATION(continued)
A.C
L
includesprobeandjigcapacitance.
B.Allinputsaresuppliedbygeneratorshavingthefollowingcharacteristics:PRR≤10MHz,Z
O
=50Ω,t
r
/t
f
≤30ns.
C.Allparametersandwaveformsarenotapplicabletoalldevices.
Figure12.InterruptLoadCircuitandVoltageWaveforms
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ProductFolderLink(s):PCA9555
Not Recommended for New Designs