Microchip's VCC4A Crystal Oscillator (XO) is quartz stabilized square wave generator with a CMOS output, operating off a 1.8, 2.5, 3.3 or 5.0 volt supply. The VCC4A uses fundamental or 3rd overtone crystals for output frequencies > 50MHz resulting in low jitter performance. VCC4A is hermetically sealed and also uses a monolithic IC, which improves reliability and reduces cost.