PCA9548A: pca9548 pin SC0 has internal diode clamp to vcc?

Hey Frank,

Just to double check a few things:

"My customer is using the PCA9548A now"

Are they using our TCA9548A or they are actually using our PCA9548A, I ask this because sometimes the schematic is a placeholder for second source ICs which may have a different name.

"When they simulate the fault condition and pull the SC0 directly to 12v, they found the pin SC0 is clamped to 3v3"

When you say simulate, do you mean they are doing this in some kind of software with an IBIS model or something? Or they are doing this in real life?

"It seems the internal circuit has a diode from the pin(SC0) to VCC. Could you please help check the reason of the pin voltage clamp to 3v3?"

If you are actually doing this on the PCB, I suspect you may actually be damaging/breaking the device. This would be considered an overvoltage situation and outside of our absolute maximum spec.

-Bobby