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CDCLVD1208 Power Supply Operation

David Escandon
Expert 2175 points
Other Parts Discussed in Thread: CDCLVD1204, CDCUN1208LP, SN65LVDS108

TI Team,

I'd like to know if I can run the CDCLVD1208RHDT beyond 2.8V? Actually, I have 3.3V available. I know the datasheet say that 2.8V is the absolute maximum, but it would be helpful to know how the device would behave in 3.3V. Maybe if we limit the 3.3V current?

-David

  • 0
    Expert 2175 points

    TI Team,

    In fact, we have been running the CDCLVD1204 at 3.3V. We'd like to know how this would affect the long term reliability? Thank you.

    -David

  • 0 in reply to David Escandon
    TI__Guru 71526 points

    Hi David,

     ABS MAX means exactly that > Absolute Maximum!  While you may have some devices that will operate at a higher Vcc, any variation in process could lower the characteristics of the device and the next lot may indeed fail at 2.9v.  There is always a window of variation built in to the spec, so to guarantee that when these process variations occur, the device will still operate to the stated performance despite the variations. 

    As such, we do not perform reliability testing at conditions outside the stated specifications. Assume that if you operate the device at 3.3v, it will fail.

    How about using the CDCUN1208LP, which will operate at 3.3v, or two of the SN65LVDS108 1:8 buffers.  Alternatively, add a 2.8v LDO into the design.

    -Leonard

     

  • 0 in reply to LeonardEllis
    Expert 2175 points

    Leonard,

    Thanks for your reply. I should add that we've been operating the device for over a year at 3.3V with no adverse effect on the performance. We are looking to see if the TI team can perform additional characterization at 3.3V. Perhaps it would be helpful to understand what types of failures we could expect if we continue operating the device at this voltage. Thanks.

    I understand if TI is unwilling to perform the characterization at the higher voltage. If that's the case, let me know.

    -David

  • 0 in reply to David Escandon
    TI__Guru 71526 points

    Hi David,

      The part is designed for 2.5v operation; we cannot advise nor recommend it be operated outside the datasheet parameters.   The ABS MAX is specified at 2.8000v and we will not imply, suggest, infer, condone, recommend, advise nor speculate operating at a voltage exceeding that specification.

    -Leonard