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TMUX1308-Q1: Behavior When Source Pin Is Floating

Ishihara Kenji
Prodigy 60 points

Part Number: TMUX1308-Q1

Please tell me specifically what kind of abnormal behavior (i.e., behavior that is not as expected) the multiplexer exhibits when an unused source pin, which is supposed to be connected to GND, is not properly soldered and is left floating.

This is to help us understand what kind of electrical operation tests we should perform to detect manufacturing defects caused by poor soldering.

  • 0
    TI__Expert 5800 points

    Hi Ishihara,

    We have a FAQ on unused pins here. 

    Overall, the incorrect soldering of the GND pin, resulting in a floating pin, can cause a range of issues that affect the TMUX1308-Q1.

    These issues may include:

    • Channel selection errors
    • Reduced signal integrity
    • Increased current leakage
    • Elevated noise levels
    • Device functionality

    Proper soldering and connection of the GND pin are essential to ensure the multiplexer operates as expected and to prevent these potential problems

    Thank you,

    Arya

  • 0 in reply to Arya Hussein
    Prodigy 60 points

    Dear Arya,

    Thank you for sharing the FAQ.

    Regarding our inquiry about the source pin being left floating, we understand that the following operational impacts may occur. If there are any other effects beyond the ones listed below, we would appreciate it if you could share them with us.

     For higher frequency applications, it is advised to tie these unused inputs to GND through a termination resistor (normally a 50ohm resistor). This is due to the possibility of noise coupling to the unused inputs and introducing crosstalk into the multiplexer which can cause fluctuations on other inputs and outputs on the device itself.



    If there are no additional impacts, we will proceed to close this inquiry.

    Thank you,
    Ishihara

  • +1 in reply to Ishihara Kenji
    TI__Expert 5800 points

    Hi Ishihara,

    I do not believe there are additional inquires.

    Thank you,

    Arya