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"May I know TCA9554A could replace NXP's PCA9554A directly"
-You should find our device to be a pin to pin replacement for the PCA9554A.
"doesn't need to modify the F/W"
I'm not sure what you mean by this. Our device is programmed the same way the PCA9554A is and should have the same default start up conditions.
"Is the difference about Vin range only ?"
It looks like our device supports a lower input range. I don't see any other major differences.