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SN74CB3Q3257: To ask IBIS model issue

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Replies: 3

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Part Number: SN74CB3Q3257

Hi team,

My customer is using the IBIS model for the bus switch "sn74cb3q3257" in the HyperLynx program to simulate the signal integrity of our PCB Layout and for some reason I cannot configure the model as an output. It only can be configured as an input which does not reflect the configuration we have on the board. 

The model_type of the model name "CB3Q3257_IO" & "CB3Q3257_IO_A"  is "Terminator".

How to use this IBIS model to do the simulation in HyperLynx with such topology?


Thanks

Regards,

Paul

Texas Instruments

 

  • Hi Paul,

    Thanks for your question. I am working with our team to address your question and I will have an update for you by end of day tomorrow. I appreciate your patience.

    Best regards,
    Kate

  • In reply to Kate Dickson:

    Hi Paul,

    Thank you for being patient, I am still working with our team to get an answer to your question. I will provide an update for you again early next week.

    Have a good weekend.

    Best regards,
    Kate

  • Hi Paul,

    Thanks again for being patient.

    I understand that you would like to use the IBIS model to model switch resistance for when the switch is on to check system-level signal integrity. The IBIS model for this device actually does not contain a model of the switch resistance. It only includes terminator models of diodes and capacitance for the switch terminals when they are turned off.

    Best regards,
    Kate

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