What kind of IC is this - part two

Brent Hilpert hilpert at cs.ubc.ca
Thu Jan 1 14:11:36 CST 2009


Oliver Lehmann wrote:
> 
> I got another one - now with picture! ;)
> 
> It is labeled
> 
>         DDU-4-
>         7992
> 
> The picture can be seen here:
> 
> http://pics.pofo.de/gallery/v/S8000/S8000_boards/P1070269.JPG.html
> 
> Wild guessing.... resistornetwork? capacitornetwork (was something like
> that around?)?

I can't say I recognise the specific device shown, but sometimes delay lines
were packaged like that.
(Guess: [Digital|Discrete] Delay Unit - 4 uS ?).

(Pulse transformers also were put in such packages in the mid-late 70's, but
they are generally associated with core memory drivers.)



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