The ICS307-01 and ICS307-02 are versatile serially programmable clock sources which take up very little board space. They can generate any frequency from 6 to 200 MHz, and have a second configurable output. The outputs can be reprogrammed on the fly, and will lock to a new frequency in 10 ms or less. Smooth transitions (in which the clock duty cycle remains roughly 50) are guaranteed if the output divider is not changed.