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SN54SLC8T245-SEP: Maximum operating frequency.

Dan Oliver
Prodigy 60 points
Part Number: SN54SLC8T245-SEP

What is the maximum frequency the level translator can handle?  We see an issue with the peak-to-peak output voltage spiking when we input a square-wave signal higher than 5Hz.  We are translating from 1.2V to 3.3V, but our 3.3V output is spiking momentarily to well over 4V.

  • 0
    Prodigy 60 points

    I should add that we see the output stay solid and stable at 3.3V like we want up to an input frequency of 8Hz.  At 9Hz we start to see the output Vp-p go higher than we are comfortable with.  We are beginning to wonder if the designers of our system who want this level translator to run with a 25MHz square-wave input were wrong to do so.

  • 0 in reply to Dan Oliver
    TI__Guru 50486 points

    Hi Dan,

    The datasheet specifies up to 190MHz at 3.3V and your low frequency should be of no concern.

    Could you help share schematics and waveforms? Thanks.

    Best Regards,

    Michael.

  • 0 in reply to Michael Ikwuyum
    Prodigy 60 points

    We are using the evaluation board for this component.  We are plugging that eval board into a "motherboard" of sorts with our own additional circuit for connectivity to the oscilloscope.  I think the prototype motherboard we put together is where we have an issue.  That information may be important to you.

    I need to get with my colleagues to see about providing the prototype test circuit we put together for interfacing with the eval board.  I am wondering if I have a GND issue, but that is just a guess.  I will respond ASAP.

    Thank you for your time!!