介绍锁相环时钟发生器CY2254

The CY2254 is a two-PLL clock generator for the Intel TritonTM chipset-based motherboard and other Pentium™ motherboards.It features four high-drive outputs at the CPU clock frequency (50, 60, or 66.66 MHz, selected by two pins), six

high-drive synchronous PCI clock outputs at half the frequency of the CPU clocks, two high-drive Reference outputs at 14.318 MHz, a 12-MHz Keyboard clock output, and a 24-MHz Floppy clock output. This application note discusses the internal architecture of the CY2254, and provides recommendations for using it in a system.