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SN74CBTLV3257: SN74CBTLV3257PWR schematic

Lawrence He
Expert 2830 points
Part Number: SN74CBTLV3257

Hi Support Team

Please help to review of SN74CBTLV3257PWR as below chart

U15 & U440

U11:

if any suggestion, Please advise me.

Thanks,

Bes regards,

Lawrence

  • 0
    TI__Genius 13950 points

    Hello Lawrence,

     If this is a high frequency application I suggest on U40 you should tie 3A(pin9) and 4A(pin12)  to ground through a termination resistor (normally 50 ohm resistor) but 4.7k Ohm resistor will be fine. This is due to the possibility of noise coupling to the unused inputs and introducing crosstalk into the multiplexer which can cause fluctuations on other inputs and outputs on the device itself.

    Also the logic input EN (pin15) of all of these devices doesn't need a termination resistor and can be directly tie to ground.

    Check out this FAQ What to do with unused pins:

    e2e.ti.com/.../faq-what-to-do-with-unused-pins-exposed-thermal-pads

    Thanks and Regards,

    Kameron Hill