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SN74CBTLV3861-Q1: Channel to Channel skew, IBIS model?

Ryuji
Guru 20090 points
Part Number: SN74CBTLV3861-Q1
Other Parts Discussed in Thread: SN74CBTLV3861

Hello,

Could you please let me know the channel to channel skew of SN74CBTLV3861-Q1?

Also, could you please share the IBIS model of SN74CBTLV3861-Q1?
Can we use the IBIS model of SN74CBTLV3861 for SN74CBTLV3861?

Best Regards,
Ryuji

  • 0
    TI__Expert 3900 points

    Hi Ryuji,

    Regarding the channel to channel skew of SN74CBTLV3861-Q1, we do not have this data in the datasheet but if you can provide us with your test requirments we can test the device in the lab. Please let us know what VCC you are using and any other helpful information about your configuration.

    Can you clarify what you are trying to accomplish using the IBIS model? This device is only a pass FET and therefore an IBIS model may not provide you with much useful information. Please see attached E2E post on why this may not be suitable for your simulation needs.

    However, if you would still like to evaluate the IBIS model the SN74CBTLV3861 is similar enough that you can use the model provided for this part.

  • 0 in reply to Dakotah
    Guru 20090 points
    Hello Dakotah san,

    Thank you for your support.
    Our customer would like to use IBIS model for signal delay time simulation.
    Should we use HSPICE model?

    Please see the following as customer configuration.
    Vcc=3.3V
    Signal frequency is 125MHz,
    Trise(20%-80%)= about 1ns
    Using for GMII signal.

    Best Regards,
    Ryuji
  • 0 in reply to Ryuji
    TI__Expert 3900 points

    Hello Ryuji-San,

    IBIS models are good for simulating I/O specs and associated tests on buffered input/outputs. The SN74CBTLV3861-Q1 is a pass FET that is not buffered therefore an IBIS model will not give you any meaningful data. We do have a spice model for this device on the Tools and Software tab. 

    The datasheet states the following propagation delay based on the Ron value and RC time constant from the load circuit.

    The load circuit is as attached:

    How does this compare to your CL and RL values? Your 125MHz signal has a period of 8ns with the prop delay of our device at 250ps. We can take a measurement if we know your load values. Also, your load value can create a potential voltage divider with the Ron value around 10ohms for your setup. If your RL is around 50Ohms this can create a drop across Ron that may not work with your VIH spec of the downstream device.