The datasheet (rev C, page 3, section 4.1) specifies the maximum output current per pin as ±10 mA. Does this hold for the case where the output is high and current is flowing into the device (sinking)? If not then how much sinking current could the device tolerate with the output high? Assume that the Vdd2 bias supply can sink the full 10 mA of current with no change in voltage, so my question is really just about what the ADUM141ES can handle.