I'm building an interface circuit for a Wii camera which requires a 25 MHz clock signal. The plans I found online show the crystal/capacitor group I'm used to, but it also adds a resistor and a hex inverter. What is the purpose of adding the hex inverter? Do I actually need it? I don't really have enough room on my board to easily fit the IC and other components. I should also add that I'm interfacing with a 3V3 mcu, so I don't need to do the line level conversion included in the plans I linked to....also all of the 7404's I have access to are 5V logic, so leaving it out would make my life MUCH easier.