I have encountered several data sheets which indicate that while a PPS pin is reserved, the firmware in a given unit may not support the function. I am not always certain that the data sheets I read are current or specific to the firmware revision of the units I am looking at.
This is not a problem that is peculiar to SF. I find this difficulty from many sources. Many user have no interest in precision timing applications. But I see that several do.
I am looking for a unit that is suitable for use at least as an Internet NTP source.