Serial Programmable PCI SS VersaClock Synthesizer

The MK1716-01 is a versatile serial programmable clock source which takes up very little board space. The device can simultaneously generate two groups of 4 output clocks and a reference clock output. Both clock groups (CLKA and CLKB) are derived from a single PLL, and have the ability to incorporate Spread Spectrum frequency modulation for reduced system EMI. Each group has control of independent PLL output divide values. Outputs may be programmed on the fly, and will lock to a new frequency in 10 ms or less. Each of the two groups are powered by a separate VDDIO voltage. The reference clock uses the fixed VDD voltage. VDDIO may vary from 2.5 V to VDD. The devices includes a OE pin which tri-states the output clocks and when tied low. IDT's VersaClockTM software allows the user to generate MK1716-01 device optimizing configuration code for target output frequencies and spread spectrum amounts.