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TXB0104: Possible to tied /OE with V_CCB instead of V_CCA?

Gim Song
Intellectual 1120 points
Part Number: TXB0104

Hi,

In the datasheet, it mentioned that /OE (Output Enable Control) should be tied to V_CCA.

Can /OE tied to V_CCB_3.3V where V_CCA_1.8V is always present?

The reason of doing this is to disable the device (TXB0104 where no output on port B) when V_CCB_0V (pull to ground through load switch output). When load switch is enabled, V_CCB = 3.3V and the device is enabled.

 

Or should we use the partial power down condition mentioned below?

Thanks.

Best regards,

Gim Song

  • 0
    TI__Intellectual 1120 points
    Hi,

    The partial power down condition is being deleted in my previous post.

    Below is the partial power down conditions from app notes (scea043.pdf):

    Under partial power down conditions, the outputs are also disabled and put into a high-Impedance state.
    This feature is referred to as VCC isolation. If VCCB = 0 V, the A-port is disabled. Likewise, if VCCA = 0V, the
    B-port will be disabled. In addition, the TXB type translators are fully specified for partial-power-down
    applications using the IOFF feature. This IOFF circuitry disables the outputs, preventing damaging current
    backflow through the device when these devices are powered-down.

    Thanks.
  • 0
    TI__Guru 62270 points
    Gim song,

    The OE is overvoltage tolerant and hence can be tied to Vccb without issues as long as both are within the recommended operating conditions of the datasheet.