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TXU0304: What would be the expected jitter on a 24MHz signal going through the TXU0304?

Jerome Villapando
Intellectual 300 points
Part Number: TXU0304

Hi, we plan to take a 24MHz signal into three of the inputs of the TXU0304. The input and output will be supplied with 1.8V thus no level translation will occur. The three outputs will be going into loads with a maximum jitter spec of 70ps. Assuming the source 24MHz has no jitter, how much jitter would the TXU0304 add?

Going off the propagation delay tables in the datasheet, if the delay has a minimum of 0.5ns to 22ns, this variance could attribute to 21.5ns jitter correct?

  • 0
    TI__Mastermind 44886 points

    Hi Jerome,

    By max jitter spec of 70ps, I presume you referring to the difference between the inputs to the outputs i.e prop delay.

    Hence, any of the 3 I/O can have any values between min and max. However, the device I/Os will all have the same condition (as opposed to 1 I/O stressed under the min condition and the other stressed under max condition). I.e all I/Os will have similar conditions, hence similar prop delay.

    You may also verify using TXU-EVM, thanks.

    Best Regards,

    Michael.

  • 0 in reply to Michael Ikwuyum
    Intellectual 300 points

    Hi Michael,

    Ok so you are confirming that all IOs will have the same propagation delay between the min and max. However, will it reliably have the same propagation delay throughout operation? Basically, for our application we can't have a clock cycle's propagation delay vary more than 70ps from the previous clock cycle's propagation delay if that makes sense.

  • 0 in reply to Jerome Villapando
    TI__Mastermind 44886 points

    Hi Jerome,

    Yes, with the same conditions, same propagation delay is expected.

    However, we do not specify jitter for our portfolio and it would be best to confirm the 70ps requirement using the TXU EVM, thanks.

    Best Regards,

    Michael.