TRS3221E: TRS3221EIRGTR

AJAY S

Prodigy 150 points

Part Number: TRS3221E
Other Parts Discussed in Thread: TRS3221

Tool/software:

Hi Ti Team,

Am Happy to assist you!

I'm looking for Technical quries for the part number below

TRS3221EIRGTR ,Description:3- to 5.5-V single channel 250kbps RS-232 line driver/receiver with +/-15-kV IEC-ESD protection

as per TRS3221 EVM User's Guide Do we really need Pullup on DIN,ROUT Signals?

Regards,

Ajay S

11 months ago

0 Ethan Sempsrott 11 months ago

TI__Genius 13862 points

Hi Ajay,

The pullup resistors to VCC are not required for DIN and ROUT signals. In a typical design application, the DIN and ROUT pins are directly connected to the MCU. The critical thing here is that these pins should not be left floating. Since EVM testing scenarios might have certain pins floating, they are tied as a precaution.

Best,

Ethan

0 AJAY S 10 months ago in reply to Ethan Sempsrott

Prodigy 150 points

Thanks ethan,

I have one more concern,

Invalid pin am not using in my design. Can i left floating or any Pullup/Pulldown is need to be added?

Ref schematic:

Please ,advise .

Regards,

Ajay S

0 Clemens Ladisch 10 months ago in reply to AJAY S

Guru 317310 points

The /INVALID pin is an output and can be left open.

0 Ethan Sempsrott 10 months ago in reply to AJAY S

TI__Genius 13862 points

Hi Ajay,

The INVALID pin can be left floating.

Let us know if you have any other questions,

Ethan

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TRS3221E: TRS3221EIRGTR