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TXB0102: What is A1/A2 state when VCCB and EN is floating?

Jason Dai
Expert 3720 points
Part Number: TXB0102
Other Parts Discussed in Thread: TXS0102

Hello E2E,

What is the output state or impedance at A side when VCCB and OE is floating but VCCA has bias voltage?

Sincerely,

Jason

  • 0
    Guru 317260 points

    The datasheet says:

    The TXB0102 device has circuitry that disables all output ports when either VCC is switched off (VCCA/B = 0 V).

    But when VCCB is floating, then C4296 might have enough remaining charge so that there is a voltage high enough to power the device.

    Please note that the TXB I/Os do not work with pull-up resistors and cannot be used for I²C/SMBUS. The TXS0102 would work in this situation.

  • 0 in reply to Clemens Ladisch
    TI__Expert 3720 points

    Hello Ladisch,

    Thanks for your reply.

    Assume we change to TXS0102 at the same configuration, what if Vccb is floating and fully discharge, what is the A side pins impedance while VCCA is still biasing?

    Sincerely,

    Jason

  • 0 in reply to Jason Dai
    Guru 317260 points

    The TXS0102 datasheet says:

    VCC Isolation Feature: If Either VCC Input Is at GND, Both Ports Are in the High-Impedance State