How to convert 0-5v inverted serial to 0-3.3v non-inverted serial
I think you're looking for an inverting amplifier. This can be done with either a BJT or a MOSFET (assuming your input is enough to turn the MOSFET on). Here's an example with a BJT:







simulate this circuit &ndash; Schematic created using CircuitLab

The output range is independent of the input and is defined by the supply voltage.