Welcome, @DWest.5, to the community!
there is no limit for such a current given or guaranteed, as footnote 2 of table 1 says:
The magnitude of the input voltage must never exceed the magnitude of the supply voltage or 15 volts, whichever is less.
You must therefore take precautions to ensure that the input voltage does never exceed the absolute (unsigned) value of the respective supply voltage, which would be the prerequisite for such a current flow.
Does it answer your question?
Regards
/Peter
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