The PI6CX100-272 is a low-cost, high-performance 3.3V VCXO, designed to replace expensive VCXO modules. The on-chip Voltage Controlled Crystal Oscillator accepts a 0 to 3.3V input voltage to cause clocks to vary from -250 ppm to +150 ppm. This device uses an inexpensive external pullable crystal at 27 MHz to produce the same output frequency.