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CDCLVC1108: logic level translation

Matthew Plante
Prodigy 10 points
Part Number: CDCLVC1108
Other Parts Discussed in Thread: LMK1C1108, LMK00338, LMK1D1208P

Tool/software:

I'm trying to verify if I power the CDCLVC11xx from 2.5V (so I can get 2.5V outputs), can I drive the input with a 3.3V signal?  I assume no since the absolute maximum ratings table states input voltage max at VDD + 0.5, but I thought it was worth asking.  I'm trying to find a good level converter and 1:8 fanout buffer combination solution to replace an obsolete item.

Thank you

  • 0
    TI__Genius 10975 points

    Hello Matthew,

    That is correct, the maximum Vin voltage would be 3V in this case. However, the LMK1C1108 would work, as shown in this statement from the data sheet:

    Best,

    Andrea

  • 0 in reply to Andrea Vallenilla
    Prodigy 10 points

    Hi Andrea,

    Thank you for the information.  I had found that part, but one thing I left out of my message was I am looking for a device without a synchronous enable input.  This is a burst clock, and I was looking at for a device to fan out clock and data signals.

    Thank you,

    -- Matt

  • 0 in reply to Matthew Plante
    TI__Genius 10975 points

    Matthew,

    Note that the LMK1C is made to buffer just clocking signals and not data signals, I would recommend you use a data buffer for distributing the data.

    We do have the LMK00338 which has individual output enables for each output bank. So you can control 4 outputs with one enable, another 4 outputs with another enable, and a singular LVCMOS output with a third enable. This device is also labeled as level translator.

    Another option is the LMK1D1208P which has individual output enables and can handle 2.5V outputs with a 3.3V input. No specifics on the electrical characteristics specs but this device is not labeled as a level translator in our portfolio but I believe that it should do the trick for you.

    Best,

    Andrea