TRS3122E: Does TRS3122E contain buffers?

Jack Zhang

Part Number: TRS3122E

Tool/software:

Hello,

I plan on using the TRS3122E to convert between CMOS logic UART signals to/from a microcontroller and a DN9 connector (RS-232 logic levels). I wanted to know if there are buffers contained within the TRS3122E part internally; otherwise, I may consider added external buffers for the CMOS UART signals on the microcontroller side. Any insight is appreciated. Thanks.

23 hours ago

0 Ethan Sempsrott 19 hours ago

TI__Expert 5116 points

Hi Jack,

TRS3122E does not contain any internal buffers. If you desire to add external buffers, here is the link to our webpage: https://www.ti.com/logic-voltage-translation/buffers-drivers-transceivers/overview.html

If you have further questions about finding the correct buffers, I can transfer this E2E thread to our Logic team responsible for TI's buffers.

Best,

Ethan

0 Clemens Ladisch 16 hours ago

Guru 285300 points

The DIN pins are read by high-impedance buffers (see the input leakage current specification), and the ROUT pins are driven by buffers with a drive strength of 2 mA (see V_OL/V_OH).

0 Ethan Sempsrott 15 hours ago in reply to Clemens Ladisch

TI__Expert 5116 points

Hi Jack,

To clarify, every RS-232 device does have some level of buffering, but not discrete buffers since they are translating RS-232 signal levels. As Clemens mentions, DIN and ROUT have high-impedance buffers as can be seen by the diagram in the datasheet:

Let us know if that answers your question,

-Ethan

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TRS3122E: Does TRS3122E contain buffers?