I would like to use the FXL4245 to level shift both 3.3v and 1.8v signals to 1.2v.
I was thinking of supplying VCCB from 1.8v, VCCA from 1.2v and setting the direction to translate from B to A. Most of the signals in port B are indeed 1.8v except one which is at 3.3v.
The fact that the control inputs are limited and refferenced to VCCA while PORT A/B inputs can go as high as 3.6v suggests that it's ok for the inputs to go that high even though VCCB might be 1.8v for example. Another clue is the fact that the outputs are guaranteed to be high-z when either VCC A or B are at 0v.
Is this assumption correct ?