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SN74AVC4T774: Connecting two channels to create a bidirectional one

Harald Hieber
Intellectual 1140 points
Part Number: SN74AVC4T774
Other Parts Discussed in Thread: TCA9406, TXS0102, LSF0102, TXU0202

Customer currently have the SN74AVC4T774 4-bit level shifter in one of their designs for a UART application.

In a new design, in addition they need a level shifter for an I2C application, which is bidirectional instead of the unidirectional UART.

 Would it be possible to connect two pins of the (A1, A2, and B1, B2) in parallel to create a bidirectional level shift for the SDA signal of the I2C bus?

Same question   for the new SN74AXC4T774 

  • +1
    Guru 243220 points

    Connecting two channels together does not create a bidirectional level shifter.

    You have to use a bidirectional level shifter for open-drain signals like the TXS0102/TCA9406 or LSF0102.

  • +1
    TI__Mastermind 22085 points

    Hi Herald,

    Customer will have to use bidirectional devices for bidirectional applications. It also seems like the customer is using a 4 Ch device for a 2 wire interface since two of the mentioned I/Os were intended to be connected together in the application. Hence, we recommend a 2 Ch bidirectional device (TXU0202 for UART and TXS0102 for I2C), thanks.

    Best Regards,

    Michael.