CY2282-1

The CY2282 is a clock synthesizer/driver for a Pentium II, or other similar processor-based PC requiring 100-MHz support.

The CY2282-1 outputs two CPU clocks at 2.5V. There are seven PCI clocks, running at one-half or one-third the CPU clock frequency of 66.6 MHz and 100 MHz respectively. One of the PCI clocks is free-running. Additionally, the part outputs two 3.3V USB clocks at 48 MHz, one 3.3V reference clock at 14.318 MHz, and one 2.5V APIC clock at 14.318 MHz.

The CY2282-11S provides the same outputs as the CY2282-1 but also incorporates the Intel®-defined spread spectrum features.

It provides a 0.5% downspread on the CPU and PCI clocks, which can improve EMI in certain high-speed systems.

A summary of clock outputs for both devices is shown below.

The CY2282 outputs are designed for low EMI emissions.

Controlled rise and fall times, unique output driver circuits, and factory-EPROM programmable output drive and slew-rate enable optimal configurations for EMI control.