The 6304/6320 from Vectron International is a Voltage Controlled SAW Oscillator with Frequency 300 to 1000 MHz, APR(pullability) ±20 ppm min, Supply Voltage 3.3 V, Control Voltage 0 to +3.3 V, Operating Temperature -40 to 85 Degree C. More details for 6304/6320 can be seen below.