From the example of VhH-L vs. Temperature characteristics, the actual value of the IC is VhH ≤ 2V. Therefore, if a voltage of approximately 2V or more is applied, it will be judged as High.
The guaranteed value of the IC is the value stated in the data sheet specifications (VhH:VCC-0.8V), By setting the H-level threshold voltage low, we have made it possible to reliably judge the H-level without relying on VCC.

