> Doesn't "logic level" usually mean "well characterized at Vgs
significantly
> LOWER than 5V"?

No, it usually means characterized at 5V.

> In particular, you want the data for TTL "on" voltage spec
> of 3.something, don't you?  (or is "real" TTL so rare these days that it
no
> longer matters?)

"Logic level" doesn't imply the FET has the same 1 and 0 thresholds as
logic (which varies a lot anyway), but that it can go from off to on with
a gate swing from 0 to the logic supply level.  In other words, it is
meant to work with the output of logic, not look like a logic input.


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