Strictly necessary cookies are on by default and cannot be turned off. Functional, Performance and Tracking/targeting/sharing cookies can be turned on below based on your preferences (this banner will remain available for you to accept cookies). You may change your cookie settings by deleting cookies from your browser. Then this banner will appear again. You can learn more details about cookies HERE.
Strictly necessary (always on)
Functional, Performance and Tracking/targeting/sharing (default off)
Applying Vdd and Vddq during QDRII/DDRII power up sequence
Question: The QDR datasheet recommends that during power up sequence to apply Vdd before Vddq. Is it mandatory during the power up sequence to apply Vdd before Vddq?
Response: It is recommended to apply Vdd before Vddq during QDRII/DDRII power up sequence. However, it is not a requirement to apply the Vdd before the Vddq for Cypress QDRII/DDRII devices and has been specified in the Cypress datasheets to accommodate the requirements of other vendors in the QDR consortium. Vdd and Vddq can be applied simultaneously during power up, as long as Vddq does not exceed Vdd by more than 0.5V during power-up.