TMUX1108: UART MUX

Zeming Kong

Expert 3515 points

Part Number: TMUX1108
Other Parts Discussed in Thread: TMUX1102, CD74HC4067, CD74HC154, TMUX1308, TMUX1204

Hi team,

We are looking for MUX for 1:10 UART communication, could you suggest best solution? Is TMUX1108+TMUX1102 ok?

Best,
Zeming

11 months ago

+1 Clemens Ladisch 11 months ago

Guru 267430 points

Those would work. But you could also use 1:16 muxes like the CD74HC4067.

There are also buffered 16-line demultiplexers like the CD74HC154, but there is no equivalent multiplexer.

+1 Kameron Hill 11 months ago in reply to Clemens Ladisch

TI__Genius 13680 points

Hello Zemming,

In addition to Clements comments(which are correct) I wanted to state that a 16:1 device like the CD74HC4067 is your best option as it can connect 1 main device to 10 other devices.

I also wanted to share a FAQ about multiplexers in uart applications which can help you learn more about this!

Finally based on multiplexer uart requirements this suggestion should work fine in your application!

https://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1064281/faq-what-analog-switch-multiplexer-should-i-use-for-uart-applications

Regards

0 Zeming Kong 11 months ago in reply to Kameron Hill

TI__Expert 3515 points

Hi Clemens and Kameron,

Thanks for your comments!

0 Zeming Kong 11 months ago in reply to Kameron Hill

TI__Expert 3515 points

Hi team,

Sorry to open this thread again. Finally the customer would like to use TMUX1204+TMUX1308 to control the UART lines.

Some outputs of IC2 will be connected to both devices, is there any problem?

Best,
Zeming

+1 Clemens Ladisch 11 months ago in reply to Zeming Kong

Guru 267430 points

This is not a problem.

0 Kameron Hill 11 months ago in reply to Clemens Ladisch

TI__Genius 13680 points

Hello zeming,

Sorry for misunderstanding your initial question.

To better understand your question I just want to clarify some things

Uart is a 2 wire communication protocol where devices can communicate with each other over 2 wires which are the TX and RX lines.

The TMUX1204 and TMUX1308 cannot be used for uart communication because they do not have 2 channels( one for tx signals and one for rx signals)

However if you would like to connect 10 uart devices to 1 main uart device please look at the picture below.

Please let me know if i can assist you anyway.

Regards

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TMUX1108: UART MUX