What about 7406's for drivers and a quad
comparator or differential line
reciever for the receiver side. That way the input threshold would be
settable...
I looked at the 7438 for drivers and the TL3116 comparator for the receiver
for a while. I found that comparators were pretty spendy if you get
them fast enough. I also had some trouble finding a quad part for an
"ultra-fast" comparator. The worst problem then was with the real-estate.
You really don't want a zillion 8 pin parts on the boards :-). (There
were some inexpensive possibilities that weren't rail-to-rail, and so
would need to run off the +/-15V or something.)
I think we may be forced down that path when parts like the Am26S10 are
no longer readily available.
Vince