TXB0104-Q1: urgency-TXB0104-Q1-would you please confirm if my level shift ciucuit can work?

CHENG KAI

Part Number: TXB0104-Q1
Other Parts Discussed in Thread: TXS0104E-Q1, TXB0104, TXS0104E, LSF0204-Q1, LSF0204, TXU0304

Hi，

Below is my schematic design for level shift，and my PCBA has been manufactured，now I review the spec

to see the OE pin，it seems must be keep low before the VCCA and VCCB power supplied，

My urgency problem is：would you please help confirm if my circiut can work for level shift?

Thanks,

Chengkai

4 months ago

0 Clemens Ladisch 4 months ago

Guru 257450 points

When you do not care about the state of the I/Os during power up, you can pull OE high directly.

But the TXB does not work with I²C. You have to use the TXS0104E-Q1 instead.

0 CHENG KAI 4 months ago in reply to Clemens Ladisch

Prodigy 70 points

Hi，

Thanks for your reply.

But now the PCBA will be get tomorrow, how can I rework to make the IIC work,do you have any suggestions?

Thanks,

Kai

0 Michael Ikwuyum 4 months ago in reply to CHENG KAI

TI__Mastermind 25090 points

Hi Cheng,

Please see below as TXB do not support open-drain and the rework should be for swapping with the P2P TXS recommendation, thanks.

Best Regards,

Michael.

0 CHENG KAI 4 months ago in reply to Michael Ikwuyum

Prodigy 70 points

Hi Michael，

Would you please recommend the P2P level shift IC for replace the TXB0104 I2C bring up? As it is a demo board so the consumer-grade IC will also be OK.

And another question is can I change the pull up Res ro be 50K that make the I2C work?

Thanks,

Chengkai

0 Michael Ikwuyum 4 months ago in reply to CHENG KAI

TI__Mastermind 25090 points

Hi Cheng,

CHENG KAI said:
And another question is can I change the pull up Res ro be 50K that make the I2C work?

You may try but 50 K may not suffice for I2C.

CHENG KAI said:
Would you please recommend the P2P level shift IC for replace the TXB0104 I2C bring up? As it is a demo board so the consumer-grade IC will also be OK.

Please help see TXS0104E / TXS0104E-Q1 or LSF0204 / LSF0204-Q1, thanks.

Best Regards,

Michael.

0 CHENG KAI 4 months ago in reply to Michael Ikwuyum

Prodigy 70 points

hi Michael，

I have another question：

For example in my design shown in below fingure, if the level shift both sides need pull up to 3V3 and 1V8, or only one side pull up to the end of SOC of 3V3 is OK?

Thanks,

Chengkai

0 Michael Ikwuyum 4 months ago in reply to CHENG KAI

TI__Mastermind 25090 points

Hi Cheng,

Using pull-up with the TXB device is okay on any side, but recommended to be > 50 Kohms, thanks.

Best Regards,

Michael.

0 CHENG KAI 4 months ago in reply to Michael Ikwuyum

Prodigy 70 points

hi Michael，

Would you please help confirm if TXS0104 can be used for SPI interface level shift?

Thanks,

Chengkai

0 Clemens Ladisch 4 months ago in reply to CHENG KAI

Guru 257450 points

It is possible to use the TXS, if you respect its restrictions. But for SPI, TXU0304(-Q1) would be much better suited.

0 CHENG KAI 4 months ago in reply to Clemens Ladisch

Prodigy 70 points

thanks a lot！

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TXB0104-Q1: urgency-TXB0104-Q1-would you please confirm if my level shift ciucuit can work?