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SN74AVC4T245 internal pull up

David Park
Expert 5440 points
Other Parts Discussed in Thread: SN74AVC4T245

Hi,

When VCC=floating, A or B pin=3.3V, what voltage can I see in VCC?

When A or B pin=3.3V, can I see some voltage xxxmV in VCC due to internal block like internal pull-up?

Thanks.

  • 0
    TI__Genius 11505 points

    David,

    I am trying to get a better understanding of what you are asking. In the application the SN74AVC4T245 is used for, when and why would you need to check the Vcc floating value?

    Applying a voltage between 1.2 V and 3.6 V to Vcc is essential for the device to function properly. If you apply 3.3 V to either the A or B port and leave the Vcc floating, you can check to see if there is a xxxmV on the Vcc pins, but the device loses function. Is there a particular reason why the floating voltage value would be important to you/your customer?

    Regards,

    Jared

  • 0
    TI__Expert 6430 points

    Hi,

    There is no internal pull-up between I/O and VCC rail. When I/O is set to 3.3v and VCC pins are floating, the VCC pin voltage is about 0V.

    Thanks