#SCPS2348238 shows an application in which the TCA6408A-Q1 can be used.
A. Device address configured as
0100000 for this example.
B. P0 and P2–P4 are configured as
inputs.
C. P1 and P5–P7 are configured as
outputs.
D. Resistors are required for inputs
(on P-port) that may float. If a driver to an input will never let the input
float, a resistor is not needed. Outputs (in the P-port) do not need pull-up
resistors.