I want to design a display which is built of 7 segment displays. It
should be able to display four numbers 99999, 99999, 99999 and 9999 , 19
digits.

For that I need a very similar driver to this one
http://shay.ecn.purdue.edu/~dsml/ece362/Homework/PDF/mc14489.pdf . 

The only difference is that I would need four groups of "a..h" outputs,
every output group for one number. I would enable ones, tens, etc... of
every number with separate inputs on the 7-segment display itself.

I've got very similar display, and it does have such chip on it. The
problem is that I do not know who manufactured the chip because the only
thing that is written on it is : "REF0032 9750K0973".

 

Does anybody know who might manufacture similar chips or who
manufactured this particular one? I can only add that the display is
quite old.

 

Thank you very much,

Sam

 

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