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TFP401: About Max hold time

Guru 19645 points
Part Number: TFP401

Is there required max hold time(th1 and th2) for TFP401?

I think that if hold time is too long, it will any influence to data signal.

Best regards,

Satoshi

  • Hi Satoshi-san,

    There are no required max hold times for this device, only minimum.

    Regards,
    I.K.
  • I.K-san

    Thank you for reply,

    If hold time set extremely long time, is it also no problem operation?

    Background is customer comparing TFP401 and Competitor(SII1161). 

    TFP401 is not described below timing specification; "ODCK-high or low" to "Data-high or low"

    I calculated min value.

    But max value is not calculated because I didn't judge it is correct to use min hold time on max value calculation. 

    Best regards,

    Satoshi

  • Hi Satoshi-san,

    The Sil1161 datasheet doesn't specify max hold time either, and states "only the minimum output setup and hold times are critical". The calculations involved are for the minimum, and I believe it is the same with the TFP401.

    Regards,
    I.K.
  • I.K-san

    Thank you for reply,

    Please let me know about additional question based on Sil1161 datasheet,

    Datasheet P18 is described below equation;

    ※Todck = 148.5MHz, Tduty = 40%~60%, ODCK FallingEdge condition

    Customer want to know TFP401's Tck2out (Clock-to-Output Timing) spec.

    But calculation result are Tck2out(max) = 0.836 ns and Tck2out(min) = -2.0936 ns, we feel that Tck2out(max) is too short time. 

    Can TFP401 apply same as above equation?

    Or, is there spec for TFP401's Tck2out(max)?

    Best regards,

    Satoshi

  • Any update on this?
    If you need additional information, please let me know.
  • Hi Satoshi-san,

    I'm not sure about that equation since the TFP401 does not have a "Tck2out" specification, so I don't believe that equation can be applied. The setup/hold times for falling edge conditions are listed on page 8 of the TFP401 datasheet.

    Regards,
    I.K.