Driving a 5v logic input from a 3.3v output
You need an inverter.
If you go shopping, you can find a logic family that will work correctly with a 3.3V input and output 0-5V.  74HCTxx an 74ACTxx families do this, for instance.  If you're doing surface-mount, you can get a one-gate inverter that'll do it.
You can also use an NPN transistor and a few resistors.  This will be slower, and may not meet the input slew rate specifications for the following stage - but it'll probably work.



simulate this circuit &ndash; Schematic created using CircuitLab