I'm running an AVR at 3.3 but need to control a component that uses 1.8v for I/O. I know I could run it through a level shifter, but if the signals are all unidirectional (AVR->Slave) can I just plunk in a few transistors instead?
My question is, will the transistor function ok if the Base->Collector voltage is positive? The base will have 3.3 from the AVR and the collector will be 1.8V through a pullup connected to VCC.
Is there another simple way of doing it without going to a full level shifter chip?