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TXS0108E: If we make VCCB to control OE, is it OK?

Lian Wu
Genius 5250 points
Part Number: TXS0108E

Dears:

Pls. kindly help to check the schematic of TXS0108E, and there is an issue as below:

Since VCCA(1.8V) can not been controlled, and VCCB(3.3V) can been control to be on or off.

If we make VCCB to control OE, is it OK? Because if VCCB to control OE, OE can be low level, when VCCB is power down.

Pls. kindly help to give some advice about it.

Thanks a lot!

Best regards

Luck Wu

  • 0
    TI__Guru* 97046 points

    Hello Luck,

    The OE pin can tolerate voltages up to 5.5V (as shown in the Recommended Operating Conditions table). The switching threshold for this input is referenced to VCCA, so the 'low voltage' on the input should be 0.35*VCCA maximum (0.63V for the 1.8V supply case).

    During power-up and power-down, the OE pin should be held LOW to ensure that the device is in a high-impedance state.

    To directly answer your questions:

    1. If we make VCCB to control OE, is it OK?

    Yes, it is OK.

    2. Because if VCCB to control OE, OE can be low level, when VCCB is power down.


    OE should be held low when VCCB is powered down to disable the device.