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Difference between Vih(ac) & Vih(dc)

 
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airace



Joined: 17 Sep 2002
Posts: 97
Location: Deep in a chip
Post10 Sep 2004 13:28   Difference between Vih(ac) & Vih(dc)
Can anyone tell me the difference between these 2 parameters.
This is normally specified for I/O buffers.

I am attaching a memory datasheet which uses these specs
Thanks in adv

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layes



Joined: 27 Sep 2004
Posts: 57
Helped: 2
Post09 Oct 2004 5:42   Re: Difference between Vih(ac) & Vih(dc)
ac through cap and ind
dc not
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Fom



Joined: 10 Mar 2004
Posts: 761
Helped: 56
Location: Taiwan
Post09 Oct 2004 6:46   Re: Difference between Vih(ac) & Vih(dc)
May be they use AC input levels when they check timing diagram to provide larger noise margin.
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leo_o2



Joined: 03 Sep 2004
Posts: 356
Helped: 22
Post13 Oct 2004 12:06   Re: Difference between Vih(ac) & Vih(dc)
I think thresholds for a fast signal (ac) and a very slow signal (dc) are different.
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