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TCA9517: Asking for the TCA9517 design

SHH
Mastermind 32346 points
Part Number: TCA9517




Hi team,
can TCA9517 use as buffer only? suppose to VCCA and VCCB connect to 3.3V that can implement buffer function according to d/s figure 9 typical series application.


BR,
SHH

  • 0
    TI__Guru* 77271 points

    Hey SHH,

    Yes, you can use TCA9517 at VccA=VccB=3.3V. The thing you need to keep in mind when using buffers in series is to make sure the sides with static voltage offsets are not connected to each other. This means B side of TCA9517 cannot connect to another B side TCA9517. A to A and A to B is okay but not B to B.

    Thanks,

    -Bobby

  • 0 in reply to BOBBY
    TI__Mastermind 32346 points
    Hi Bobby,
    Thanks. What is the input and output capacitance on TCA8517?
    the HDMI DDC request the spec is 50pF.

    BR,
    SHH
  • 0 in reply to SHH
    TI__Guru* 77271 points
    Hey SHH,

    TCA9517 has a maximum capacitance of 13pF and a typical of about 8pF. The testing done to certify this device may not work with our B side because it has a static voltage offset on B side which will conduct during the capacitance measure and give a false capacitance value much larger than 50pF. Your testing needs to be done on A side.

    Thanks,
    -Bobby