The data lines are good up to the voltage level of the Vcc line.So if power from 3.3V, your data out lines will be ~3.3V and any incoming lines should be <=3.3V.If you power from 5V, same thing: outputsp will be ~5V, and any coming lines should be <=5V.
it has a Vcc reading 3 volts and another Vcc that reads 5 volts.
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