PCF8574_02 Datasheet, PDF (13/24 Pages) NXP Semiconductors – Remote 8-bit I/O expander for I2C-bus

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slave address (PCF8574A)
data to port
SDA S 0 1 1 1 A2 A1 A0 0 A
1
start condition
R/W acknowledge
P3
from slave
SCL
12 345 678
P3
OUTPUT
VOLTAGE
P3
PULL-UP
OUTPUT
CURRENT
A
I _OHt
data to port
0
P3
AP
MBD971
I _OH
Fig.15 Transient pull-up current I_OHt while P3 changes from LOW-to-HIGH and back to LOW.