TXB0108: When using one direction fixed

Hiroaki Yuyama TED

Part Number: TXB0108

Tool/software:

Dear Voltage-Level Translator Support Team,

When using the TXB0108 in a unidirectional manner, is it possible to use a pull-up/down resistor value of Several kilo-ohms on the input port?

Also, among the 8 ports, is there any recommended pin handling for A/B ports in case of unused circuits?

Best Regards,
Hiroaki Yuyama

3 months ago

0 Clemens Ladisch 3 months ago

Guru 316960 points

Yes, you can add any pull-up/-down resistor to a pin that is always an input.

Unused I/Os can be left open. You can add 100 kΩ pull-downs to ground on both sides if you want to prevent them from having opposite values for a short time during power up; see [FAQ] What should be done with unused I/O pins of the level translator devices?

0 Jack Guan 3 months ago

TI__Mastermind 40696 points

Hi Yuyama-san,

Today is a TI holiday- responses will be delayed and the team will get back to you as soon as possible.

Regards,

Jack

0 Jack Guan 3 months ago in reply to Jack Guan

TI__Mastermind 40696 points

Hi Yuyama-san,

It seems that Clemens' has addressed your previous concerns, please feel free to reach out for any additional questions.

Regards,

Jack

0 Hiroaki Yuyama TED 3 months ago in reply to Jack Guan

Expert 1720 points

Hello Jack Guan-san,

Thank you for your reply.
We will respond to customers based on Clemens-san's advice.
Even if the pin is one-way, external pull-up/pull-down should be as recommended in the data sheet and application notes.
Unused I/O pins can be left floating without any problems.

Best Regards,
Hiroaki Yuyama

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TXB0108: When using one direction fixed