I've seen a related thread on here (it's locked so I could not respond) claiming that the PCA9306 can do 3.3V <-> 2.8V level translation on an I2C bus. The posts references figure 5 (which in the current datasheet is a 1.8V <-> 3.3V translation application).
I would like to double-check that this use case is possible. On page five there is a note saying "To support translation, VREF1 supports 1.2 V to VREF2 - 0.6 V. VREF2 must be between VREF1 + 0.6 V to 5.5 V." Which would imply shifting 3.3V <-> 1.8V would violate this requirement (assuming VREF2 = 3.3V, VREF1 has to be 1.2V to 2.7V).
If the PCA9306 cannot do 2.8V <-> 3.3V conversion please suggest a part, if possible. Board area is a significant consideration for my current design.