The PE3291 is a dual fractional-N FlexiPowerTM phase-lock loop (PLL) IC designed for frequency synthesis. Each PLL includes a FlexiPowerTM prescaler, phase detector, charge pump and onboard fractional spur compensation. The FlexiPower prescalers are supplied power on dedicated pins and can operate at a substantial power savings at voltages as low as 0.8 volts, while allowing a 3 volt charge pump supply. For 3 volt only systems, on-chip voltage regulation may be used to generate the prescaler power supplies.