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SN74AVC2T45-Q1: Low Tpd device recommendation

Delaney Berger
Intellectual 2475 points
Part Number: SN74AVC2T45-Q1
Other Parts Discussed in Thread: SN74AVC2T45

Hi Team, 

I am looking for an AEC-Q part with low tpd.  

The application is to make two copies of the same signal (They don't have to be zero delay outputs). tpd is more critical. Lower the better. It is a 1.8V operation.The frequency will be in max of 10Mps or lower.

 I did find  SN74AVC2T45-Q1 part. For this part, the tpd seem to be 2.5nS @ 1.8V and will be using with Direction control fixed at all the time.

 

Do we have anything better than this? 

This level translator seems to be a bidirectional one. Do you have any concern about using this for uni-directional data passage with respect to reflections and such?

Thank you, 

Delaney

  • 0
    TI__Mastermind 33805 points

    Hi Delaney,

    Delaney Berger said:
    I did find  SN74AVC2T45-Q1 part. For this part, the tpd seem to be 2.5nS @ 1.8V

    Could help double confirm where this is referenced in the datasheet? 

    Delaney Berger said:
    The application is to make two copies of the same signal (They don't have to be zero delay outputs). tpd is more critical. Lower the better. It is a 1.8V operation.The frequency will be in max of 10Mps or lower.

    Do you mean both supplies would be 1.8V?

    Delaney Berger said:
    This level translator seems to be a bidirectional one. Do you have any concern about using this for uni-directional data passage with respect to reflections and such?

    Yes, we recommend to not use bi-directional devices for applications that are not bi-directional to avoid DC issues similar to the mentioned. However, please note that the SN74AVC2T45 part mentioned is direction controlled and not bi-directional / auto-directional.

    For such direction, AVC would be the best option.

    For bi-directional devices; and with such a low data rate, I would recommend to take a look at the LSF devices, thanks.

    Best Regards,

    Michael.

  • 0 in reply to Michael Ikwuyum
    TI__Intellectual 2475 points

    Hi Michael, 

    let me confirm a few of these items with the customer. 

    I am not looking for a bi-directional device, so I don't think the LSF family will be a good option. 


    With respect to a directional controlled device, that has a low tpd, what would be our best option?

    Thank you, 
    Delaney

  • 0 in reply to Delaney Berger
    TI__Mastermind 33805 points

    Hi Delaney,

    The AVC family you are clarifying about would be the best option for the direction control application in regards to the propagation delay, as of this time.

    Please also help double confirm what application would require such a small propagation delay, to help further confirm if the channel to channel skew of the is what is intended to be lower. If so, please note that the AVC device was bench tested to average less than 1 ns (about 400ps) for the skew, thanks.

    Best Regards,

    Michael.

  • 0 in reply to Michael Ikwuyum
    TI__Intellectual 2475 points

    Hi Michael, 

    Thank you for the feedback! The interest is to make two copies of a signal and pass it to two different logic blocks. Only one logic block will be using the signal. So, it is a uni directional application. The two outputs need not have very low skew with respect to each other as only one of the copies will be used at a time. What is important is the input to output propagation delay. Looking at using in the A to B direction.

    Please let me know if this changes anything. 

    Thank you, 

    Delaney

  • 0 in reply to Delaney Berger
    TI__Mastermind 33805 points

    Hi Delaney,

    For the input to output propagation delay, please help refer to the datasheet as the AVC device would be the best option as of this time, thanks.

    Best Regards,

    Michael.