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No output from PCA9507D

Question asked by Yuji Kadowaki on Dec 3, 2019
Latest reply on Jan 7, 2020 by Yuji Kadowaki

When port B is + 3.3V drive master and port A is + 5V drive slave, data and clock from port B may not be output from port A.
There are PCA9507Ds that do not occur depending on the individual PCA9507D.
If PCA9507D, which has a problem, is installed in a separate + 5V drive product, the problem will not occur.
Is there any possible cause?
Have similar bugs been reported?