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TS3A5018: Propagation delay form COM to NC and NO

Kawamoto Hiroshi
Prodigy 10 points
Part Number: TS3A5018
Other Parts Discussed in Thread: TS3A5223

I'm considering to use this MUX.

I would like to confirm propagation delay from COM to NC and COM to NO but can not find any information in data sheet.

Also would like to confirm these delay among Channels, such as COM to NC1, NC2, NC3 and NC4.

Also COM to NO1, NO2, NO3 and NO4.

Please give me advice.

  • 0
    Guru 244220 points

    This device (like all analog switches) is a passive switch. When the switch is closed, it behaves like a resistor.

    There is no propagation delay. However, the on-state resistance and capacitance form a low-pass filter which can slow down signal edges; this is described by the bandwidth limit.

  • 0 in reply to Clemens Ladisch
    Prodigy 10 points

    Thanks for the explanation.

    I understand your explanation that will applied on chip inside of the multiplexer.

    Between chip bond pad and package pin, there are bond wires and interconnect of package, these outside configuration of

    chip may cause several 10ps changes on channels (ex.COM to NC1, NC2, NC3 and NC4).

    Is my idea have misunderstandings?

  • +1 in reply to Kawamoto Hiroshi
    TI__Mastermind 23673 points

    Hey Kawamoto,

    As Clemens mentioned, these are passive FETs. The propagation delay will be negligible, especially compared to the bond wires and frame of the IC itself. So your understanding there is correct. In reality, when it comes to the propagation delay it greatly relies on the output loading conditions. 
    You can get an approximate value though by using the passive equivalent model. This will be the On resistance in series and the ON Capacitance to GND, plus any load that is given. 

    This E2E goes a little more in depth on it.
    https://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1015689/tmux1208-propagation-delay-of-tmux1208

    To give a decent idea of the propagation delay, take a look at the TS3A5223, which is a similar device in the same family. The propagation delay there, tested with a load of 35pF and 50ohms, is approximately 100-200ps depending on the supply voltage. As stated though, this will be more of a result of the loading conditions, including any traces and or wiring from the device. The silicon itself will add negligible delay. 


    Thanks,
    Rami

  • 0 in reply to Rami Mooti1
    Prodigy 10 points

    Hi Rami,

    Thanks for additional explanations. I will use this device in my product in future.