can an opamp sink current

P

panfilero

Guest
can an opamp sink current? I'm guessing yes, since I would guess
there may be some kind of totem pole thing going on at the output and
thats how regular 7400s roll at their output so... since 7400 can
sink, opamps can sink....

????
 
panfilero wrote:

can an opamp sink current? I'm guessing yes, since I would guess
there may be some kind of totem pole thing going on at the output and
thats how regular 7400s roll at their output so... since 7400 can
sink, opamps can sink....

????
Yes.
Click to expand...
Most do.

You may find some odd balls that have source and sink outputs
separated as 2 outputs to be used in applications like A and (A not)
type signals where Open Emitter or Collector is specified.

P.S.
Some op-amps Rail to rail, and others Rail/near Rail while the
most common of them simply Near Rail/Near Rail on the outputs.

Most voltage comparators have open collectors which mean they
sink only.

http://webpages.charter.net/jamie_5"
 
On Tue, 24 Mar 2009 17:44:56 -0700 (PDT), panfilero
<panfilero@gmail.com> wrote:

can an opamp sink current?
Click to expand...
Yes, essentially every one. Many can sink more than they can source.

ECL logic is open-emitter so can't sink. I vaguely remember an ancient
opamp that had an emitter-follower output and needed an external
pulldown, but that was long ago.

John
 
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