OV-7604 Crystal Oscillator The OV7604-C7 clock oscillator from Micro Crystal offers ultra-low power consumption and a narrow frequency tolerance. Combining a CMOS-based oscillator with a 32.768 kHz crystal unit encapsulated in a 3.2 x 1.2 mm ceramic case, this OV-7604-C7 crystal oscillator is space efficient. It offers high vibration and shock resistance.