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SN74CB3Q3253: Suitable for JTAG signals

ali kelem
Intellectual 400 points
Part Number: SN74CB3Q3253
Other Parts Discussed in Thread: TMUX1511, TMUX1309, TS3A5017

Hi,

SN74CB3Q3253 suitable for JTAG signals?

I need 1:4 switch for 4 seperate JTAG devices.

Thanks.

Ali

  • 0
    TI__Genius 9132 points

    Hi Ali,

    If your JTAG signal voltage and bandwidth is within the recommended operating conditions, then SN74CB3Q3253  can work. 

    Do you need 2 channels or 4 channels for your application?

    Here is a list of devices you can further look at in the device search tool  that support JTAG signals.

    Regards

    Saminah

  • 0 in reply to Saminah C
    Intellectual 400 points

    Hi Saminah,

    Actually, I need 3 channel for TMS,TDI,TDO,TCK signals.

    I'm using 3 devices have JTAG port. (IMX8 , STM32 , CPLD)

    Our JTAG signals in 3V3 level.

    But, Triple /or Quad channel 1:4 switch doesn't exist in TI products.

    I think I can use 4 pieces 1:4 switch seperately. For example; may be chosen 4 x TMUX1511

    I'd like to ask a question about TMUX1511;

    One side of TMUX1511 have to connect together (seen picture below). Is it a problem? Can be connected to each other (like common node)?

    Thanks for you help.

    Ali

  • 0 in reply to ali kelem
    TI__Genius 9132 points

    Hi Ali,

    The  TMUX1511 is a good part but  from the block diagram you shared, i would recommend using a solution with minimum number of ICs:

    • 4:1, 2 channels devices like the TMUX1309 - This part comes in small SOT-23 (THIN) package - using 2x of these parts will give you smaller footprint
    • 1:1, 12 or 16 channel bus switch like the SN74CB3Q16245 if you need a single control line.

    Regards

    Saminah

  • 0 in reply to Saminah C
    Intellectual 400 points

    Hi Saminah,

    Many thanks for your recommendation.

    TMUX1309 is more suitable for me but I think, it isn't in sale. It seems "preview" in TI product.

    I couldn't find it common component distributors like digikey or mouser.

    So, focused to another IC.

    Maybe, TS3A5017 (1:4 Dual Ch.) seems suitable. BW is 165MHZ in 3.3V

    Many JTAG devices has 100MHz jtag max. clock freq. I can find smaller footprint (UQFN 2.6x1.8mm) in stock.

    TS3A5017 should be sufficient.

    Regards.

    Ali

  • 0 in reply to ali kelem
    TI__Genius 9132 points

    Hi Ali,

    You can definitely use the TS3A5017. 

    You can use the TMUX1308 that has same signal path and performance as the TMUX1309 - only configuration is different.

    Thanks

    Saminah