Up to +/-64mA can be applied to each of the 16ch.


However, 64mA is the maximum rating, so please use it so that it does not exceed even a little. The data sheet P6 stipulates that ron in the electrical characteristics is up to Io = 30mA, so I think you should use it at 30mA or less.

You can see the datasheet from the link below.
SN74CB3Q16244 data sheet

*This answer is as of datasheet Rev.A.
Please note that chapters and drawing numbers may change when the datasheet is updated to a new revision.