LM2903: Sinking current at output pin of the IC

See figure 6-3:

Hello Sudharshana,

There is really not a "Max" sink current, until you get to the current limit region.

The "Max" would be looking at the graph that Clemens displayed and finding the maximum VOL voltage that can be tolerated.

We recommend staying be;low 10mA.

See section 6 of the LM339 family appnote:

Application Design Guidelines for LM339, LM393, TL331 Family Comparators