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TS5A23159: Two switches behind each other

Philipp-Alexander Blum
Prodigy 20 points
Part Number: TS5A23159

My circuit requires to switch the USB-C port between some ICs. In order to do so, I came up with two TS5A23159DGSR behind each other.
Selected via a DIP switch to ground or VCC. Just wanted to check, if this is a solution that should work.


  • +1
    TI__Mastermind 26848 points

    Hey Philipp,

    Whether this will be an issue will depend on the frequency you're working with. When you cascade devices like this, you will see the effects of On-capacitance and On-Resistance from both muxes. The effects aren't so linear so it's hard to give an exact measure of the effects but I did actually run some tests on a separate device with a similar cascading setup and saw that I lost a little less than half the -3dB bandwidth when I cascaded 2 muxes. So I would say your 100MHz bandwidth of this devices may be closer to 60MHz.

    What is the clock frequency here? Typically on square waves, you'll want to have 5-7 times the clock frequency as the bandwidth of the mux to account for the harmonic components of the square wave.

    Thanks,
    Rami

  • 0 in reply to Rami Mooti1
    Prodigy 20 points

    Nevermind. It's not even cascading. The first one is directly from USB and the other one behind the USB to UART controller.
    Any way. Thanks for the info.
    Tested the circuit and the issue were related to other things I just misinterpreted.