What's the meaning of Vsig?

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FredXu

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There is a Vsig parameter in a HSTL I/O(1.5v) description as below:
The Vsig parameter for this I/O ranges from .20-.70v.

What's the meaning of Vsig?
 

The JEDEC HSTL 1.5 standard document can be found here:

https://www.jedec.org/download/search/jesd8-6.pdf

I didn't see anything directly referencing Vsig. Perhaps the spec you are referring to concerns one of the hysterysis thresholds such as Vil (ac) etc. Or perhaps the DC differential input voltage range?

Can you point out the document you are referring to?
 

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