The BR9177FL allows implementation of fractional-N or integer-N phase-locked loop (PLL) frequency synthesizers if used with an external loop filter and external reference frequency. The BR9177FL has an integrated voltage controlled oscillator (VCO) with a fundamental output frequency ranging from 1.62 GHz to 3.24 GHz. In addition, divide-by-1/ 2/ 4/ 8/ 16/ 32 or 64 circuits allow the user to generate RF output frequencies as low as 25.5 MHz. Control of all the on-chip registers is through a simple serial interface. The device operates with a power supply ranging from 3.0 V to 3.6 V and can be powered down when not in use.