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Original question:

TMUX1574: About input and output voltage.

TMUX1574: when two SPI master with different VIO (3.3V, 1.8V) accessing SPI flash with 1.8VIO

Dong Kim1
Prodigy 10 points
Part Number: TMUX1574

Hi everyone,

Also, I want to make sure if the below diagram is working or not.

The question what I have is what is the voltage level of SPI_D_1.8VIO when signal A is selected?

When signal A or B is selected, their voltage level transfer to the device side or not? 

Thanks,

/Dong

  • 0
    TI__Guru 52252 points

    Hi Dong,

     

    The TMUX1574PWR will pass signals up to 2 * VDD with a maximum output voltage of 5.5V.

    So in response to your first question if signal A is selected than the SPI_D_1.8VIO will be: 3.3V - Iload * Rds(on).

    For your second question, this part will pass Signal A or Signal B, depending on what signal has been selected by the enable pin, as is. As long as the signal A or signal B is less than Vdd * 2, which in this case would be 3.6V, the signals will pass with a small voltage drop across the switches resistance.

    If you have any other questions please don’t hesitate to ask!

     

    Best,

    Parker Dodson