Datasheet

A
A
A
A
S 0 0 1 1 A1A2 A0 1 Data 1 1 PData 2
Start
Condition
8 Bits
(One Data Bytes)
From Port
Data From PortSlave Address
R/W
87654321
t
ir
t
ir
t
sps
t
iv
Address Data 1 Data 2
INT
Data
Into
Port
B
B
A
A
Pn
INT
R/W A
t
ir
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
iv
R
L
= 4.7 kΩ
V
CC
C
L
= 100 pF
(see Note A)
INTERRUPT LOAD CONFIGURATION
DUT
INT
ACK
From Slave
ACK
From Slave
1.5 V
PCA9557
www.ti.com .................................................................................................................................................... SCPS133I – DECEMBER 2005 – REVISED JUNE 2008
PARAMETER MEASUREMENT INFORMATION (continued)
A. C
L
includes probe and jig capacitance.
B. All inputs are supplied by generators having the following characteristics: PRR ≤ 10 MHz, Z
O
= 50 Ω , t
r
/t
f
≤ 30 ns.
C. All parameters and waveforms are not applicable to all devices.
Figure 11. Interrupt Load Circuit and Voltage Waveforms
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