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CDCLVP111-SP: Clock Driver "Leakage Current" specification

Raed Barghash
Prodigy 30 points
Part Number: CDCLVP111-SP
Other Parts Discussed in Thread: CDCLVP111EVM-CVAL

Data sheet does not specify leakage current but there is interest in knowing:

  1. why is it not specified in the data sheet?
  2. what is the expected leakage current value?
  3. what value limit is acceptable while keeping the other data sheet parameters in compliance or without impacting or degrading them?
  4. how to interpret or assess leakage current value with respect to maintaining proper functional operation of the device?
  5. what is the easiest method and how to measure the leakage current while the part is installed on a PCB, including TI's evaluation module CDCLVP111EVM-CVAL?
  • 0
    TI__Mastermind 22061 points

    Hi Raed, 
    Our AE team will look into this as soon as they can.

    Regards, 

    Vicente

  • 0 in reply to vicente flores prado
    TI__Genius 9250 points

    Hi Read,

    Thanks for your patience. Are you interested in the leakage current on the inputs of the buffer? because LVPECL output always have a DC current on the outputs P and N as its an emitter follower. Its roughly around 14 mA. That's why you don't see leakage current spec and current depends on different output driver and their loadings.

    For input current values. You can refer Electrical Characteristics table in the datasheet.

    Best,

    Asim

  • 0 in reply to Asim Khan
    Prodigy 30 points

    Thank you for feedback.

    I am actually concerned over Input Leakage current “I(L)”. So, this would be for the LVPECL Clock Inputs of the Clock Driver device, receiving a clock from an LVPECL oscillator. kindly, please reply to each of the 5 questions so they are properly tracked.

  • 0
    TI__Genius 9250 points

    Hi Raed,

    Below are my answers to your questions above.

    Raed Barghash said:
    why is it not specified in the data sheet?

    Its specified in the datasheet electrical characteristic section as input current.

    Raed Barghash said:
    what is the expected leakage current value?

    Datasheet specification is 150uA.

    Raed Barghash said:
    what value limit is acceptable while keeping the other data sheet parameters in compliance or without impacting or degrading them?

    To maintain electrical spec, acceptable values would be the one in Electrical table.

    Raed Barghash said:
    how to interpret or assess leakage current value with respect to maintaining proper functional operation of the device?

    Leakage current would could affect when you have a high impedance and then combined with this leakage current you can get a VIH or VIL spec violated. But this should not be the case for your clock driver. This number is small enough that your clock driver to buffer should be able to overcome.

    High impedance 

    Raed Barghash said:
    what is the easiest method and how to measure the leakage current while the part is installed on a PCB, including TI's evaluation module CDCLVP111EVM-CVAL?

    You can use a source meter that can do a VI measurement. By forcing the datasheet conditions specified in the table. You can measure current.

    Best,

    Asim