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LSF0204: auto direction detection function and device recommend

Lillian Liu(SH)
Expert 4620 points
Part Number: LSF0204
Other Parts Discussed in Thread: TXU0204, , TCA39306, TCA9416, LSF0102, TXS0102

Hi team,

I have two questions to consult you.

1. I see some of our level shifter with auto direction detection function, but I can't find specific introduction in datasheet, can you help explain how the device realize the auto direction detection function or give me some learning file about this function?

2. My customer Huaqin want to find a level shifter for pos machine: Vin 1.8V, Vout 1.8V & 3.3V, smallest size. Can you help recommend a suitable device?

Thanks 

BR 

Lillian

  • 0
    Guru 317370 points

    1. There is no level shifter that actively detects the direction. LSF/TXS level shifters are passive switches; when an input is low, the switch closes so that the input signal also pulls the other side low; when both pins are high, the switch is open, and the voltages at the pins are determined by the pull-up resistors. TXB level shifters always output signals in both directions; the very low impedance of the output buffers allows other devices to override the voltage.

    2. How many channels? What protocol? When you are mentioning Vin and Vout, does this means that the signals are not bidirectional? (Unidirectional signals going in different directions can be handled with devices like the TXU0204.)

  • 0 in reply to Clemens Ladisch
    TI__Expert 4620 points

    Hi Clemens,

    Thanks for your reply!

    Update requirement： bidirection, I2C, 1MHZ, 2 channels, smallest size

    Thanks

    Lillian

  • 0 in reply to Lillian Liu(SH)
    Guru 317370 points

    The LSF0204 has four channels.

    The LSF0102 and TCA39306 need external pull-up and biasing resistors; the TXS0102/TCA9416 has internal pull-up resistors.