What are these ICs, help me find datasheets!

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cy-yzm

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What are these ICs?

In the frequency counter,there are the two chips:
The first chip: S 10125N FFS7875 8927VK

The second chip: PSSR SP9680 .8919A

What are these ICs?

Where may I find their data sheets?
 


The sp9680 is a very old prescaler, I think it was made by Plessey.

David
 

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