TXS0104E: Pullup resistor on Input and output

Jebin Satheesh Kumar

Intellectual 280 points

Part Number: TXS0104E
Other Parts Discussed in Thread: LSF0204, TXU0304, TXU0204,

Hi Ti Team,

If i add a 10K Pullup resistor on Input and Output, it will create any issues in the Long Run?

Jebin

over 1 year ago

0 Michael Ikwuyum over 1 year ago

TI__Mastermind 37475 points

Hi Jebin,

It will not create issues as the internal pull up is also 10K. Hence, total pull-up on the line will be equivalent to 10K.

However, if the value of the external pull-up changes, the major impact would be on VOL.

Please see Effects of pull-ups on TXS and Factors Affecting VOL of TXS further clarifying, thanks.

Best Regards,

Michael.

0 Jebin Satheesh Kumar over 1 year ago

Intellectual 280 points

Hi Michael,

Thanks for the quick reply. I have one more question.

When I use TXS0104E for I2C Level Translation i.e. 1V8 to 3V3, in this case required to add a Pullup? (1V8 side I have added 2.2K Pullup resistor and 3V3 side there is no pull-up).

Jebin

0 Clemens Ladisch over 1 year ago in reply to Jebin Satheesh Kumar

Guru 295730 points

The TXS has internal pullups. External ones should never be needed.

0 Michael Ikwuyum over 1 year ago in reply to Jebin Satheesh Kumar

TI__Mastermind 37475 points

Hi Jebin,

Please refer to the referenced app notes to help set expectations as 2.2K is stronger than 10K.

If you must use the 2.2K, please see LSF0204.

Also see TXU0304 / TXU0204 best suited for the UART application (using auto bidirectional devices for applications that are not auto bidirectional is not the best recommendation), thanks.

Best Regards,

Michael.

0 Jebin Satheesh Kumar over 1 year ago in reply to Michael Ikwuyum

Intellectual 280 points

Hi Michael,

Thanks for the info, will look into the application note.

TXS0104E.can be used for I2C Level translation? As the Datasheet says "4-Bit Bidirectional Voltage-Level Translator for Open-Drain and Push-Pull Applications".

Jebin

0 Michael Ikwuyum over 1 year ago in reply to Jebin Satheesh Kumar

TI__Mastermind 37475 points

Hi Jebin,

Yes, similar to Clemens' feedback, the device includes internal pull-ups saving on BOM.

Hence, TXS can be used as-is for I2C applications without additional external pull-ups, thanks.

Best Regards,

Michael.

0 Jebin Satheesh Kumar over 1 year ago in reply to Michael Ikwuyum

Intellectual 280 points

Thanks for the Quick reply.

Jebin

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TXS0104E: Pullup resistor on Input and output