5X7 50M 3.3V 20PPM 5X7 50M OSC 5X7 54M 3.3V 20PPM 5X7 55M OSC 5x7 6.7458M OS 5X7 60.000MHZ 5X7 60M OSC 5X7 61.44M OSC 5X7 64M OSC 5X7 66.000MHZ