Functional Description

The CY2280 is a Spread Spectrum clock synthesizer/driver for a Pentium II, or other similar processor-based PC requiring 100-MHz support. All of the required system clocks are provided in a space-saving 48-pin SSOP package. The CY2280 can be used with the CY231x for a total solution for systems with SDRAM.

Features

? Mixed 2.5V and 3.3V operation

? Clock solution for Pentium? II, and other similar processor-based motherboards

— Four 2.5V CPU clocks up to 100 MHz

— Eight 3.3V sync. PCI clocks, one free-running

— Two 3.3V 48-MHz USB clocks

— Three 3.3V Ref. clocks at 14.318 MHz

— Two 2.5V APIC clocks at 14.318 MHz or PCI/2

? EMI control

— Spread spectrum clocking

— Factory-EPROM programmable spread spectrum margin

— Factory-EPROM programmable output drive and slew rate

? Factory-EPROM programmable CPU clock frequencies for custom configurations

? Available in space-saving 48-pin SSOP package