Here's the question for the floor:
If you could have only four 3.3v CMOS driver types, what
would you have. (Aside from HSTL, SSTL, etc.) One obvious
candidate is a reflected-wave driver for 50-ohm nominal
lines; that comes to about 10mA at 350mV from the rails
under worst case conditions. A 65-ohm reflected-wave
driver would run about 25% lighter, or about 8mA.
Incident-wave is another matter entirely.
SO! the floor is open for nominations. Keep in mind that
excessively strong drivers are both inherently slower and
more vulnerable to SSO degradation.
-- D. C. Sessions email@example.com