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SN74HCS86: Why the IIK spec is different between sn74hcs86 and sn74lvc86A?

Part Number: SN74HCS86
Other Parts Discussed in Thread: SN74LVC86A,

Hi Team,

Compared with sn74hcs86 and sn74lvc86A datasheet, I saw IIK support +/-20 mA  (when VI < –0.5 V or VI > VCC + 0.5 V) in sn74hcs86 datasheet.

But sn74lvc86A just support -50mA rather than +/-50mA.

Why doesn't sn74lvc86A support +50mA?

And sn74AHC86A also just support  -20mA rather than+/-20 mA.

Do you have any suggestions?