I am in need of a solution to downconvert a digital signal from one voltage domain to another. The input signal is a square wave with 1.8V pk-pk amplitude, but its ground reference (logic low) will be anywhere from 0V to 5.6V. (So the square wave could be from 0-1.8V or from 5.6V-7.4V when its ground is elevated.) I need to convert this to a digital signal that is referenced to fixed system ground with a 3.3V pk-pk amplitude. Will the ISO6720 solve my problem? It's not clear from the datasheet if there are limits on the absolute voltages of GND0 and GND1, respectively. Please let me know if my problem is not clear.