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TMUX1308-Q1: Propagation delay time and calcuration of stability time for switching

Yonekawa Iori
Prodigy 50 points
Part Number: TMUX1308-Q1

Tool/software:

(1)In TMUX1308-Q1 datasheet, Propagation delay time tPD is defined but no explanations.

I found TMUX405x datasheet describes about tPD as folowing. Is this the case also for TMUX1308-Q1?

”Propagation delay is defined as the time taken by the output of the device to rise or fall 50% after the input signal has risen or fallen past the 50% threshold. Figure 7-7 shows the setup used to measure propagation delay, denoted by the symbol tPD.”

(2)I also want to calculate stability time for switching the device. I guess I can calcurate from following equation. Is this correct?

Stability time for switching the device = Transition-time between inputs (tTRAN) + Break before make time (tBBM) + Propagation delay(tPD)

  • +1
    Guru 316440 points

    1. This is the definition of the propagation delay. Please not that for an analog switch that creates a direct connection between the pins, the propagation delay depends mainly on the drive strength of the signal source; the specified value assumes an infinitely-strong source and is probably not realistic for your actual application.

    2. tTRAN already includes the other times (see section 8.4). I do not know how you define "stability time", but the time until the output signal goes from 50 % to 0 % or 100 % depends on the rise/fall time, i.e., on the source's drive strength.