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SN74AVC4T245: Vol issue

Allan Fan
Expert 7210 points
Part Number: SN74AVC4T245


Tool/software:

Hi experts,

Customer used SN74AVC4T245 and have an issue that the Vol is not low enough at 3.3V side in below system block.

Wondering is there any internal pullups in the chip? or do you have any idea what might goes wrong? 

  

Regards,

Allan

  • 0
    Guru 318490 points

    The SN74AVC4T245 does not have internal pull-up resistors. Its output will pull the line up only when its input is high.

    When the VOL is too high, then some other device or resistor is pulling the line high. Try disconnecting them to see which one is responsible.

  • 0
    TI__Mastermind 27600 points

    Hello Allan,

    What is the VOL value the customer is seeing? Like Clemens mentioned, if VOL is above the datasheet spec then something is pulling the line high. I would remove anything connected to the level shifter output and measure at the pin.

    Regards,

    Josh