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TXB0108: TXB0108

rafael
Prodigy 10 points
Part Number: TXB0108
Other Parts Discussed in Thread: SN74AHCT541, TXU0304, TXU0104, SN74LVC1G17

Hello Texas Instruments Team,

Please, I would like to know if I can use this component as indicated in the schematic, with one signal received at 5V towards 3V3, and the other 7 signals received at 3V3 towards 5V.

Best regards,

Rafael

  • +1
    Guru 244230 points

    Maybe.

    The TXB has very restrictive limitations on the input drive strength and the output load (see section 8 of the datasheet). If you have no long traces, cables, connectors, or pull-up/-down resistors, then it can work.

    Your signals are not bidirectional, so you do not actually need an auto-bidirectional translator. A unidirectional or direction-controlled translator would be cheaper and more robust. You could combine a TXU0104 and a TXU0304, if they are available. Alternatively, use a buffer with overvoltage-tolerant input (e.g., SN74LVC1G17) for the USART_RX, and a buffer with TTL-compatible inputs (e.g., SN74AHCT541) for the ANODE signals.

  • 0 in reply to Clemens Ladisch
    Prodigy 10 points

    Thank you Clemens, I really liked your suggestion. The TXU0104 and the TXU0304 are perfect for for my application.