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CDCE6214: Use case as zero delay buffer

Hirokazu Takahashi
Expert 8420 points
Part Number: CDCE6214

Hello support team,

We are researching zero delay buffer with level shifter.

I can found zero delay mode in CDCE6214.

Is it possible to do with CDCE6214?

* Clock rate : 148MHz

* Input : 3.3V

* Output : 1.8V

* Propagation delay : zero (please let me know the min/max value)

If you have any alternative options, please let me know.

Best Regards

Hirokazu Takahashi

  • 0
    TI__Mastermind 18070 points

    Hi Hirokazu,

    There's internal feedback and external feedback options. External feedback can provide better alignment. The actual delay also depends on the PCB trace length. Regardless, the delay variation is less than +/-400ps in the datasheet. 

    Regards,
    Hao

  • 0 in reply to Hao Z
    TI__Expert 8420 points

    Hello Hao

    Thanks for your prompt support.

    Can CDCE6214 support the different voltage at Input and Output?

    Input is 3.3V, Output is 1.8V

    Best Regards,

    Hirokazu Takahashi

  • 0 in reply to Hirokazu Takahashi
    TI__Mastermind 28550 points

    Hello Takahashi-san,

    I see your point, the datasheet never explicitly states if the VDD_REF, VDD_VCO, VDDO_12, or VDDO_34 can be connect to different or the same supply rail.

    In... section 10.2.2 it says,

    "1. 1. Either tie the power supply pin (VDD_REF, VDD_VCO, VDDO_12 and VDDO_34) together or independently connect them to the 1.8-V, 2.5-V, or 3.3-V power supply."

    I expect this means they can be the same or different voltage rails.  Allowing different voltage rails would meet your requirement for 3.3-V input and 1.8-V output, but I will double confirm and we will let you know.

    73,
    Timothy

  • 0 in reply to Timothy T
    TI__Mastermind 18070 points

    Yes it allows different voltage rails.

    Regards,

    Hao