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What is $V_{IH}$ and $V_{IL}$ in datasheets? I found High-level input voltage and Low-level input voltage on the datasheet?

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You are correct. In the attached document shows minimum 2.0V and above is considered Logic High. Likewise maximum voltage of 0.8V and below is considered logic low.

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They are the extremes of the voltage at the input which define the required 0 and 1 logic levels. On the data sheet Logic 1 must be at least 2.0v and logic 0 less than 0.8 to function properly.

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    $\begingroup$ It might be better to say "2.0 V is the minimum voltage guaranteed to be read as logic 1 and 0.8 is the maximum voltage guaranteed to be read as logic 0. In-between these levels is undefined." But you've got the right idea. Welcome to E.SE. $\endgroup$
    – Transistor
    Jan 24 at 18:22

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