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TCA9511A: Confirmation

May
Genius 9880 points
Part Number: TCA9511A
Other Parts Discussed in Thread: PCA9306

Hi,

If I power the TCA9511A off a 3.3V rail, can I connect it to a 5V bus? The datasheet suggests tying the bus lines to VCC, but the maximum ratings for those pins is not dependent on VCC. Also if I'm not using the part for hot swapping, is there any difference between the I2C IN/OUT sides?

Thank you in advance.

Regards,
Maynard

  • 0
    Guru 276420 points

    The bus pins indeed are overvoltage tolerant.

    Other than the hot-swap stop bit detection, there appears to be no difference between the two sides.

  • 0
    TI__Guru 57930 points

    Hi Maynard,

    Clemens is correct in that the in side and outsides are the same aside from the stop bit detection. 

    I do need to point out that the device was not designed/validated/tested to act as a level shifter. Connecting to a 5V rail while the device runs on 3.3V may cause issues with the device when the rise time accelerators turn on and could back bias into Vcc. We would not recommend trying to use the device as a level shifter as would recommend placing something like a PCA9306 in front of it if level shifting is required.

    -Bobby