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TXB0102: TXB0102DCUR

Baiping Zhang
Prodigy 10 points
Part Number: TXB0102
Other Parts Discussed in Thread: TXU0102, TXU0202

为什么TXB0102DCUR这个料，3.3V这边的波形正常，5V这边的波形波异常，低电平不会到0V,这是什么情况，麻烦帮忙解答一下，谢谢。

  • 0
    TI__Mastermind 33755 points

    Hi Baiping,

    Note that the full schematic isn't shown. If an external resistor is added as either a pull-up or pull-down, a resistor divider network will be formed with the 4kΩ buffer. If the value of the resistor is too small, the VOH or VOL will be impacted. If the value is large, (i.e. >50kΩ), there will be very little change in the output voltage level.

    Please see A Guide to Voltage Translation with TXB. Also, UART applications are not auto bidirectional and would not recommend an auto bidirectional device for non-auto bidirectional applications. Hence, further recommend TXU0102 / TXU0202, thanks.

    Best Regards,

    Michael.