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[FAQ] What is the VIH / VIL required for a Schmitt-Trigger device?

FAQ: Logic and Voltage Translation >  Fixed DIR / DIR CNTRL Level-Shifters >> Current FAQ

Consider the worst-case values in the electrical characteristics table; VT+(max) and VT−(min) are what matters for VIH and VIL respectively. See Understanding Schmitt Trigger.

However, the VOL / VOH values into the level-shifter are most likely different than your actual worst case. They are specified for a certain output current and the actual output current will be much smaller when connect to a high-impedance CMOS input. Hence, the actual output voltages into the level-shifter will be near GND or VCC. 

Note, CMOS outputs can be modeled as resistors; see [FAQ] What is the output voltage (VOH or VOL) when the output current is X or the supply voltage is Y?)