Determining Absolute Maximums for IC Output Current and Power
Data sheet has this row


  IO# VCC = 5.5 V, VO = 2.25 V −20 −112 −30 −112 mA


and a note explaining the -112mA


  The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.


So for absolute max, there you are. I'd be sure to design for well under that tho. Other (later) datasheets do better, even showing Abs Max current on the VCC &amp; Gnd pin (70mA on HC595 for example, so many of them running in Arduino project are definitely being overstressed driving LEDs!)

74AC family is much better, with +/- 24mA outputs.

Many logic inputs are very light loads tho, in the range of uA for CMOS for example.