The XC2164 series are high frequency, low current consumption CMOS ICs with built-in crystal oscillator and divider circuits. For fundamental oscillation, output is selectable from any one of the following values for f0: f0/1, f0/2, f0/4, and f0/8. With oscillation capacitors and a feedback resistor built-in, it is possible to configure a stable fundamental oscillator or 3rd overtone oscillator using only an external crystal.