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Original question:

CDCLVP111-EP: |Vih – Vil| clarification

CDCLVP111-SP: input threshold

Michael T Schneider
Expert 3790 points
Part Number: CDCLVP111-SP


Can you help with the below question regarding the LVPECL clock driver CDCLVP111-SP.

I wanted to see if I could get some clarification for input threshold for the device. On Pg. 7 of the datasheet the minimum input amplitude is specified as 0.5V. From what I could gather on TI support questions(http://e2e.ti.com/support/clock-and-timing/f/48/p/761088/2813337#2813337?jktype=e2e)  it looks like this is referring to the single ended input the device sees. Is this correct? So when looking at the differential signal the thresholds will be +/- 500mV. Is that a correct statement? Thanks.

  • 0
    TI__Genius 14540 points
    Hi Michael,

    VID is the difference between the high level and the low level for a single input. This has a specified minimum value of 0.5V. Since the input itself has two of these single ended inputs, the 'differential' voltage between both inputs is twice this voltage or 1Vpp-diff, or, as you say, +500mV to -500mV. You are correct.

    Thanks
    Christian