Ref ADuM1200-EP Rev. B datasheet, page 6:
For the MIXED 5 V/3 V OR 3 V/5 V OPERATION, the typical Logic High Output Voltages are given as 3.0V and 2.8V for their given test conditions. Should this actually be similar to the non EP version, i.e. "VDD1 or VDD2" and "(VDD1 or VDD2) - 0.2" such that is also covers the 5V VDD2?