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TS3A27518E: Signal propagation delay

MaWü
Prodigy 220 points
Part Number: TS3A27518E

Hi TI engineers,

I got a question regarding signal (data I/O) propagation delay for QSPI application.

For my understanding the propagation delay from switch signal input to switch signal output (COM to NO or NC pins) should be small and is usually very insignificant because the closed switch act just like a resistor in terms of delay from signal input to output. Please correct me if I am wrong.

For my design the input- to output- delay of the multiplexer/switch (TS3A27518ERTWR) shall not introduce more than 100-150ps additional delay to the PCB path. Can TI guarantee a this?

Thanks in advance

Matthias

  • 0
    TI__Genius 9132 points

    Hi Matthias,

    You are correct. 

    The TS3A27518E is a passive FET switche and have almost no propagation delay due to the silicon die.  The significant portion of the delay is due to the bond wire and packaging as seen in this e2e post below.  Typically the packages these switches are in have single digit ns to ~100s ps propagation delay. 

    I found this post when searching the switches and multiplexers e2e forum about  TS3A27518E propagation delay.

    Regards

    Saminah

  • 0 in reply to Saminah C
    Prodigy 220 points

    Hi Saminah,

    thank you for reply.

    Following the post/link there is table which shows a dependency on temperature.

    This means at 25 (degree Celsius?) there is a 200ps propagation delay? Will propagation delay decrease when using BGA instead of WQFN package?

    Thanks and regards

    Matthias

  • 0 in reply to MaWü
    TI__Genius 9132 points

    Hi Matthias,

    Yes, it is 25 Celsius.

    The propagation delay will increase for BGA as it is laminate package with substrate routing in the package that makes the signal slower compared to WQFN.

    Regards

    Saminah

  • 0 in reply to Saminah C
    Prodigy 220 points

    Thank you Saminah,

    that is interesting. How would be the delay for TSSOP package?

    Regards

    Matthias

  • 0 in reply to MaWü
    TI__Genius 9132 points

    Hi Matthias,,

    From package standpoint, TSSOP will have longer delay compared to QFN because of longer leads.

    Regards

    Saminah