The datasheet specifies:
(min) (nominal) (max)
OPP5: 1.2825v 1,35v 1,4175v
OPP4: 1,2065v 1,27v 1,3335v
OPP3: 1,14v 1,2v 1,26v
OPP2: 1,007v 1,06v 1,113v
OPP1: 0,93575v 0,985v 1,03425v
It's also interesting to note that the absolute maximum ratings table states a maximum voltage of...