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Original question:

SN74CBTLV3257: Solution suggestion for application

  • TI Thinks Resolved

SN74CBTLV3257: Solution suggestion for JTAG level shifting

Prodigy 50 points
Ashwin srinivasan

Part Number: SN74CBTLV3257

Whether all the IO pins are Open collector? Since i have seen in the CBT data book, ten(enable time) its mentioned as Open collector for the mentioned part number.

I have connected the JTAG signal with 1.8V in the A port and 2.5V in the B1 and B2 ports just need to know whether thats fine or i need to level shifter ? 

Prodigy 50 points
Ashwin srinivasan
  • Mastermind 37065 points
    Adam Torma

    Ashwin,

    The SN74CBTLV3257 is a passive FET switch that will connect the input directly to the output.  If you have two different voltage domains you will need to use a level shifter device maybe like the TXB0104. 

    Thank you,

    Adam

  • Prodigy 50 points
    Ashwin srinivasan

    In reply to Adam Torma:

    thank you adam, since we are using the JTAG signals with different voltage levels i have some concern about that. Thanks for clarification.
  • Expert 3960 points
    Karan Kotadia

    In reply to Ashwin srinivasan:

    Hello Adam,

    The TXB0104 might not be the best solution for you for a level shifter. This is an auto bidirectional level shifter with very little drive strength.
    Based on your speed and bit requirements you can use our parametric search to find a level shifter that works best for you.
    One possible device you can use is the SN74AXC8T245.

    Thanks!
    - Karan

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