Using single resistor to receive 5v signal on the 3.3v rated pin
If you are serious about building reliable designs with todays high density chips you should never place a voltage on a pin that exceeds the range specified in the maximum ratings section of the manufacturers data sheet. 

People who promote low cost shortcuts, such as the unitary 10K resistor resistor to isolate a 3.3V input from a 5V source, are not serious about building reliable electronics that can last for a long time unless they are are using an device that has documented 5V tolerance on its I/O pins.

There are a multitude of different chips designed with either 5V tolerant inputs or designed to properly level translate from 5V down to 3.3V. Use one of those, or if you want something cheaper that comes with a lower bandwidth, then you can utilize two resistors at each input as a voltage divider to step the 5V down to 3.3V.