Olin Lathrop wrote:
>> Take a look at this circuit:
>>
>> http://upload.wikimedia.org/wikipedia/en/7/72/Electronic_Amplifier_Push-pull.png
>>
>> It's easy to see that the push-pull can actively drive the output in
>> both directions (HIGH and LOW).
>
> Only if you believe the author's claim that this really should be called
> "push pull".  Apparently that term has gotten misused since its original
> meaning, and that misuse has stuck in at least a few places.  I guess it's 
> a
> handy term that seems to be applicable, especially for those that never
> learned its original definition.

You mean, the original definition from the pre-transistor era? Perhaps your 
definition needs to be updated? :) The meaning of words can change over 
time.

-->FWIW, in Russian this type of circuit that has pnp/npn or 
N-channel/P-channes FETs, is called "pushpul'nyi kaskad" (lit. "push-pull 
cascade").

The name in this situation, makes total sense: the output is "pushed" by one 
transistor, then it's "pulled" by the other one.

Vitaliy 

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