The min of VIH is 2V.
I wonder this device can accept 2.5Vpp input signal. Is that possible?
(On the datasheet it is mentioned as the following,
The input switching levels have been lowered to accommodate TTL inputs of 0.8 V VILand 2 V VIH. This feature makes it Ideal for translating up from 3.3 V to 5 V. Figure 5 shows this type of translation.)