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LSF0102: LSF0102 pull-up resistors risk

Kevin Huang8
Genius 5201 points

Part Number: LSF0102

Tool/software:

Hi

I have a question about the LSF0102 design.
If B1 and B2 don't have pull-up resistors to 3.3V, will terminal B reference the voltage at terminal A (1.8V)?

The application requirement is to be active at 1.1V. If the actual measured voltage at terminal B is 1.8V, are there have any risks?

  • 0
    Guru 325310 points

    When any input voltage (on either side A or B) is below Vref_A, then the LSF connects the two pins on sides A and B directly, and the LSF works as an analog switch. When the input voltages are at Vref_A or higher, then the switch is open, and the voltage on the other side is determined by the pull-up resistor; without a pull-up resistor, the pin is floating, i.e., its voltage is random.