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TMUX1108 : Information

Diallo thierno
Prodigy 20 points
Part Number: TMUX1108
Other Parts Discussed in Thread: TMUX1111,

Peut-on remplacer le tmux1111 par le tmux1108 pour avoir plus de sortie et réduire les broches logiques (contrôle) tout en ayant la même précision ?

  • 0
    TI__Mastermind 23393 points

    Hello Diallo,

    I've translated this to "Can the tmux1111 be replaced by the tmux1108 to have more output and reduce the logic pins (control) while having the same accuracy?".

    Bien que les deux dispositifs présentent une faible fuite, les interrupteurs de précision qui remplacent le TMUX1111 par le TMUX1108 peuvent ne pas fonctionner puisque le TMUX1111 est un commutateur 1:1 à 4 canaux alors que le TMUX1108 est un commutateur 8:1.Si vous n'activez qu'un seul canal à la fois et que la sortie est alimentée sur le même chemin de signal, il peut s'agir d'un remplacement.Pour 8 interrupteurs haute précision 1:1, 2xTMUX1111 fonctionne.Vous pouvez lier les broches logiques ensemble si vous n'avez pas besoin d'un contrôle indépendant pour toutes les broches.

    ^^ "While both devices are low leakage, precision switches replacing the TMUX1111 with the TMUX1108 may not work out since the TMUX1111 is a 4 channel 1:1 switch while the TMUX1108 is a 8:1 switch. If you're only turning on one channel at a time and the output is all fed to the same signal path it could be a replacement. For 8 1:1 high precision switches 2xTMUX1111 would work. You can tie the logic pins together if you don't need independent control for all of them."

    Thanks,
    Rami

  • 0 in reply to Rami Mooti1
    Prodigy 20 points

    The goal is to have a maximum of 64 outputs that will read sensors separately, so using the tmux1111 requires more pins. Which is why I wanted to know if I could use the tmux1108 instead to reduce the control pins. For the 64 outputs, I connect the drains together and for reading I activate and deactivate the ENs.

    Do you have any other suggestion for me if I can't replace 1: 1 type tmux1111 to 8: 1 type tmux1108?

  • +1 in reply to Diallo thierno
    TI__Mastermind 23393 points

    Diallo,

    My understanding here is that you're looking to create what is effectively a 64:1 multiplexer. You could use 8xTMUX1108 and tie all the drain together. Keep in mind though that you will be adding off capacitance for each device that is off, which could add up quickly. If your signal is slower, than it may not be an issue at all.
    You'll also be accumulating the drain leakage from all the devices as well. These devices are pretty low leakage and even adding up all the leakages, it still may be suitable for your design, depending on how much leakage you're allowing for in your precision system.

    Thanks,
    Rami