Other Parts Discussed in Thread: TXS0104E, LSF0204
Tool/software:
hello
As shown in the figure below:
We are using TXBN0304 for level conversion of a set of MDIO signals, where the VCCB side operates at 3.3V and the VCCA side at 1.2V.
Following the datasheet recommendation, I used 20K pull-up resistors on both ends as these signals are open-drain, hence requiring pull-ups on both sides.
However, during testing we found that the high-level voltage on the 1.2V side only reaches 1.0V maximum, which we consider too low. We aim to adjust it to at least 1.1V or higher.
Therefore, I plan to modify the pull-up resistors R634 and R635 (VCCA side) to 18K while keeping R632 and R633 (3.3V side) at 20K. Please help confirm if this is feasible.
When modifying VCCA side pull-up resistors to 18K, does the VCCB side also need to be adjusted to 18K? If the MDIO levels on the VCCB side already meet requirements, can they remain unchanged?
thanks!
