You're right, I shouldn't trust googles results that fast, after looking it up once it indeed was the wrong datasheet, sorry.
It's nice those input pins indeed are 5 volt tolerant, but.... I wonder how 5v-tolerant the vdd325-pin is.
The HX-less version can take 5volt, but the selectable vdd325 voltage of the HX is 1.8-3.3v, applying 5 volts may be too much.
An input pin on arduino will see anything below 0.5 volts as low and above ~2 volts as high though, it doesn't need 5v. I'd apply 3.3 volt to the vdd325 pin to stay within limits, with a good chance that it will work.