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DDR3 specification for AC175 and AC150

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tom_hanks

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Halo,
I am working on DDR3 interface.
Do you know the difference between AC175 and AC150??
Why there is AC reading in high speed sginals, upto know I have only dealt with Vih(dc) and never used Vih(ac).

how to check the AC input logic high Vih(ac) in Oscillocope??

why are they using AC rating with DC ratings??

Tom
 

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