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SRAM

Anonymous
Not applicable

"Reference Schematic Design Recommendation for QDR-DDR II/II+/Xtreme SRAMs - KBA84386" www.cypress.com/ states that Vtt and Vref are both VDDQ/2, but that they have separate capacitor banks. Why the distinction?https://www.cypress.com/?id=4&rID=72249

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Employee

Hi,

   


   

        

   

                  

   

 

   

 

It is better to have two different circuits for generating VTT and Vref. In this case the voltage variations becasue of Vterm will not affect Vref.


   

So separate decoupling network for VTT and Vref is preffered.

   


   

Thanks

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2 Replies
Employee

Hi,

   


   

        

   

                  

   

 

   

 

It is better to have two different circuits for generating VTT and Vref. In this case the voltage variations becasue of Vterm will not affect Vref.


   

So separate decoupling network for VTT and Vref is preffered.

   


   

Thanks

View solution in original post

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Anonymous
Not applicable

 Thank you PRIT!

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