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TXB0304: QSPI Signal Level Conversion

takahiro higuchi
Prodigy 240 points

Part Number: TXB0304

Tool/software:

Hi team,

We are considering level conversion for the QSPI signal (1.2V ⇔ 1.8V).
When SCK = 25MHz, is the TXB0304 suitable for level conversion of D[3:0]?

Best regards,

  • 0
    TI__Mastermind 31380 points

    Hello Takahiro,

    The TXB0304 can be used to support QSPI but please take a look at this E2E Thread. Since TXB has no DC drive strength, it's best to use short traces and placed near the controller and peripheral. 

    Regards,

    Josh

  • 0 in reply to Joshua Salinas
    Prodigy 240 points

    Hi team,

    Thank you for your response.

    It states that QSPI is supported,
    but is this still possible when a MUX (TMUX1574RSVR) is present downstream?

    I am concerned about the following points:
    ・DC drive strength
    　The DC drive strength is low, so the MUX may not operate.
    ・Operating speed
    D[3:0] may not operate at SCK=25MHz due to the MUX propagation delay.

    I am considering the following configuration:
    ・SCK=25MHz
    ・Level Shift(TXB0304) - MUX - QSPI Nor Flash

    Best regards,

  • +1 in reply to takahiro higuchi
    TI__Mastermind 31380 points

    Hello Takahiro,

    The issue is not the data rate since TXB can support up to 100Mbps

    I agree, the issue with using this part is the drive strength, especially if we need to drive a Mux IC. The impact can be minimized if we place the TXS next to the MUX.

    Regards,

    Josh