Datasheet

PCA6408A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 1 — 27 September 2012 25 of 40
NXP Semiconductors
PCA6408A
Low-voltage, 8-bit I
2
C-bus and SMBus I/O expander
a. Interrupt load configuration
b. Voltage waveforms
C
L
includes probe and jig capacitance.
All inputs are supplied by generators having the following characteristics: PRR  10 MHz; Z
o
=50; t
r
/t
f
 30 ns.
All parameters and waveforms are not applicable to all devices.
Fig 27. Interrupt load circuit and voltage waveforms
002aag979
DUT
C
L
= 100 pF
R
L
= 4.7 kΩ
INT
V
DD(I2C-bus)
10000
AD
DR
1 AS0
slave address
START condition R/W
acknowledge
from slave
002aag980
8 bits (one data byte)
from port
A
acknowledge
from slave
SDA 1
no acknowledge
from master
data into
port
data from port
DATA 1
DATA 2
INT
DATA 2
DATA 1
P
STOP
condition
t
v(INT)
t
rst(INT)
t
su(D)
12345678SCL 9
ADDRESS
t
rst(INT)
A
A
View A - A
INT
Pn
t
v(INT)
0.5 × V
DD(I2C-bus)
0.5 × V
DD(P)
View B - B
SCL
0.5 × V
DD(I2C-bus)
INT
R/W A
t
rst(INT)
0.3 × V
DD(I2C-bus)
0.7 × V
DD(I2C-bus)
B
B