TXB0104: Does the OE pin necessarily need to be pulled down?

Tess Chen

Part Number: TXB0104

Hi,

Please find the application block diagram as below. Figure 2 shows the 3.3V signal at B port and figure 3 shows the signal at A port.

Question:

The signal at A port is not as expected and signal at A port could be improved by lowing down the VCCA to 1.2V. Does the OE pin necessarily need to be pulled down? What's the possible cause for the phenomena? Thanks.

over 5 years ago

0 Chad Crosby over 5 years ago

TI__Expert 6680 points

Hi,

Do you have a more detailed schematic? Could you provide scope shots of the B side as well?

Thanks!

Chad Crosby

0 Tess Chen over 5 years ago in reply to Chad Crosby

TI__Intellectual 2675 points

Hi,

I don't have a detailed schematic. The scope shots at B side is shown in above Figure 2. And you could find more A side shot with different Vcca in the below:

Vcca=1.4V and Vcca=1.2V.

0 Clemens Ladisch over 5 years ago in reply to Tess Chen

Guru 316600 points

Without a schematic, I'd guess that the circuit does not conform to the requirements in sections 8.3.2/3/5 of the datasheet.

0 Chad Crosby over 5 years ago in reply to Tess Chen

TI__Expert 6680 points

Hi,

I'm going to need to see a more detailed schematic in order to help you better. I do not believe the problem is at all with the OE pin, but rather with the other parts of the system.

If the customer is concerned about sharing their schematic on a public forum, you may contact me directly.

Thanks!

Chad Crosby

Logic

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TXB0104: Does the OE pin necessarily need to be pulled down?