The ICS601-21 is a low-cost, low phase noise, high performance clock synthesizer for applications which require low phase noise and low jitter. It is ICS' lowest phase noise multiplier. Using ICS' patented analog and digital Phase Locked Loop (PLL) techniques, the chip accepts a 10 - 27 MHz crystal or clock input, and produces output clocks up to 220 MHz at 3.3 V.