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LSF0108: on SPI signal

Shu-Cheng LIN
Guru 11785 points
Part Number: LSF0108

Hi Sirs,

Sorry to bother you.

We have use LSF0108 on SPI signal.

Schematic as below, because have size concern, we need know what pin's must add external pull up resistor and what pins can be removed.

Could you help us check?

Thanks!!

  • 0
    TI__Guru* 97046 points
    Hi,
    In order to know which pins require pull-ups and which do not, I need to know a few things about the each channel:

    Which direction is each signal going? (up-, down-, bi-directional translation)
    What type of output is driving the LSF input? (push-pull or open-drain)
    How much leakage does the receiver device have? (uA, max)

    Example:
    Channel 1 - down translation only - driven by push-pull device - 0.1uA leakage (max)
    Channel 2 - bi-directional translation - driven by push-pull on both sides - 1uA leakage (max) on both sides
    etc.