The MPC980 is a 3.3V dual PLL clock generator targeted for high end PentiumTM and PowerPCTM 603/604 personal computers. The MPC980 synthesizes processor as well as PCI clocks from a 14.31818MHz external crystal. In addition the device provides two buffered outputs of the 14.31818MHz crystal as well as a 40MHz SCSI clock, a 24MHz floppy clock and a 12MHz keyboard clock. One of the buffered 14.31818MHz outputs can be configured to provide a 16MHz output rather than the second copy of the 14.31818MHz output.