• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 16 subscribers
  • Views 1465 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TMUX136: Break before make or make before break

Nicholas Carley
Genius 9925 points
Part Number: TMUX136
Other Parts Discussed in Thread: TMUX1136

Hello,

Can you confirm if the TMUX136 is a make-before-break switch or break-before-make switch. I was not able to verify this in the datasheet. Or if this does not matter for I2C switching?

Is it better to use a switch rather than a multiplexer for I2C bus switching?

Thanks,
Nick

  • 0
    TI__Expert 5660 points

    Hi Nick,

    Break-before make delay is a safety feature that prevents two inputs from connecting when the device is switching. TMUX136 does not have the break-before-make (BBM) or make-before-make feature. BBM delay allows devices to be used in cross-point switching applications and prevents signal glitches. So, this feature may not be necessary for your application or I2C switching. TMUX1136 is a device of the same configuration that includes the BBM delay feature, if you are interested in BBM delay for your application.

    Switches and multiplexers have electrically equivalent signal path architecture. What distinguishes switches and multiplexers from each other is the configuration. Traditionally, switches are of 1:1 or 2:1 configuration and multiplexers select one path out of multiple signal paths (4:1, 8:1, etc). So, whatever configuration you choose is completely up to your system needs, and not necessarily specific to a protocol such as I2C. Additionally, switches (or muxes) may have differing select line logic, such as individual line (channel) switching or switching all lines together (bus switching). Feel free to check out this video on basics of switches and multiplexers.

    We have a great analog switch parametric search tool that you can check out to find switches/muxes of certain configurations, channels, supply voltage, and features such as break-before-make. Additionally, I would like to point out that all analog switches are capable of switching I2C signals (and do not necessarily always have the I2C label on the datasheet), as long as the input/output voltage is within the recommended operating conditions of the switch.

    If you would like, you can send me a schematic or block diagram and I can help you choose the best TI switch for your application!

    Regards,

    Kate