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LSF0108: Questions from customer

Oliver Lin
Expert 4475 points
Part Number: LSF0108

Tool/software:

Hi team,

Customer has an application listed below.

Power sequence is 3.3V(VrefB) -> 1.2V(VrefA)

Q1.If 3.3V presents, no 1.2V yet, Also pull up at B1. Is there any leakeage on A1? 

Q2. 3.3V and 1.2V both presented, what will trigger another side to go low or go high? That is level trigger or edge trigger?

  • 0
    Guru 316940 points

    1. Some current will flow into Vref_B and out of Vref_A, so Vref_A is likely to be above 0 V. This will result in a high signal on Ax. The only way to prevent this would be to pull EN low.

    2. The LSF is a passive switch. For voltages between 0 V and Vref_A, it works as an analog switch. For higher voltagets, the switch is open, and the voltages on both sides are determined by the pull-up resistors.

    See [FAQ] How do the LSF translators work?