TMUX8109:RS422

Gokul Raj

Prodigy 65 points

Other Parts Discussed in Thread: TMUX8109, TMUX2889

Hi,

Can you please suggest 2:1 MUX similar to TMUX8109, Which can support +-5V I/O signals.

I am using this Mux for RS422 signal standards.

over 1 year ago

0 Clemens Ladisch over 1 year ago

Guru 271790 points

Use the search function; here are dual 2:1 switches for a ±5 V supply: ti.com/switches-multiplexers/analog/products.html#480=2&1143=2:1 SPDT&3307=+/-5 The Ron of the TMUX‍6136 is likely to be too large.

(But I'm not sure where you get the ±5 V limits from. The outputs of a RS-422 transmitter are between GND and 5 V (the differential bus voltage can be negative because it is measured between the two data lines), and if there are ground shifts in your system, the bus voltages might be larger than ±5 V.)

0 Gokul Raj over 1 year ago in reply to Clemens Ladisch

Prodigy 65 points

Hi Clemens Ladisch,

Thanks for your quick response,

Yes my RS422 transmitter outputs are 0V to 5V, but when measured between them they can be negative.

There are no ground shifts in my system.

Can you please recommend part for RS422 0V to 5V operation.

0 Clemens Ladisch over 1 year ago in reply to Gokul Raj

Guru 271790 points

Just change the filter to single 5 V: ti.com/switches-multiplexers/analog/products.html#480=2&1143=2:1 SPDT&3306=5

0 Santiago Fonseca over 1 year ago

TI__Prodigy 420 points

Hi Gokul,

As Clemens suggested, we have various dual 2:1 switches compatible with your application, however I wanted to bring this new device to your attention. The TMUX2889 is a dual channel 2:1 MUX with +/-5V I/O signal capabilities, as well as a typical Ron of 0.16 Ohms. I believe this would be an excellent MUX for your application.

TMUX2889 data sheet, product information and support | TI.com

Regards,

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TMUX8109:RS422