Hi,
The diagram is saying how much current each channel can deliver depending on how it is driven.
Example, if you have all eight inputs fully on the 8 outputs can only deliver about 180ma each.
Rather than going over the details of the chip it might be easier if you say what your input signals are and what your output devices/ loads are going to be.
Given all that, in the real world its good practice not to drive any device to its maximum or your can expect early failure /excessive heat.
I typically derate all power components by at least 30%.