This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS51200: question to JEDEC's "Power-up initialization sequence"

Part Number: TPS51200

Hi Team, 

JEDEC's「Power-up initialization sequence」 says DDR3 application needs to meet either ① or ②. 

But my understanding is TPS51200 don't meet ①, is it correct that if TPS51200 can meet ②, TPS51200 can be used in DDR3 application? 

  • VDD and VDDQ are driven from a single power converter output, AND
  • The voltage levels on all pins other than VDD, VDDQ, VSS, VSSQ must be less than or equal to

VDDQ and VDD on one side and must be larger than or equal to VSSQ and VSS on the other side.

In addition, VTT is limited to 0.95 V max once power ramp is finished, AND

  • Vref tracks VDDQ/2.

 

  • Apply VDD without any slope reversal before or at the same time as VDDQ.
  • Apply VDDQ without any slope reversal before or at the same time as VTT & Vref.
  • The voltage levels on all pins other than VDD, VDDQ, VSS, VSSQ must be less than or equal to

VDDQ and VDD on one side and must be larger than or equal to VSSQ and VSS on the other side.

Thanks.

Regards,

Jo

  • Jo,

    The TPS51200 is a device that is used specifically for VTT in DDR applications, it is not a complete solution. The only part of (1) that would apply to the TPS51200 is limiting VTT to max 0.95V once power ramp is finished, as well as tracking VDDQ/2 - TPS51200 is a part designed to track VDDQ/2.

    The TPS51200 can be and has been used in numerous DDR3 applications, per both the datasheet and other threads on E2E.

    Thanks,

    Kadeem