Infineon/CYPRESS CY2291FXKJ

The CY2291 is a third-generation clock generator family. It is upward compatible with industry-standard ICD2023 and ICD2028, continuing their tradition of offering highly customizable functionality to meet diverse clock synchronization system requirements. All devices provide a highly configurable feature set for PC motherboard applications. Each of the four configurable clock outputs (CLKA–CLKD) can be assigned one of 30 frequencies in any combination. Multiple outputs configured for the same or related frequencies exhibit low (<500 ps) skew, effectively providing on-chip buffering for heavily loaded signals. The CY2291 is configurable for 5 V or 3.3 V operation. The internal ROM table uses EPROM technology, allowing full customization of output frequencies. The reference oscillator is designed for crystals in the 10 MHz to 25 MHz range, providing additional flexibility. No external components are required when using such a crystal. Alternatively, an external reference clock with a frequency between 1 MHz and 30 MHz may also be used. Customers using a 32 kHz oscillator must connect a 10 MΩ resistor in parallel with the 32 kHz crystal.

• Three integrated PLLs
• EPROM programmable
• Factory programmable (CY2291) or field programmable (CY2291F) device options
• Low skew, low jitter, high precision outputs
• Power management options (shutdown, OE, suspend)
• Frequency selection options
• CPUCLK smooth switching
• Configurable 3.3 V or 5 V operation
• 20-pin SOIC package

• PC motherboards
• "Green" PCs
• Laptops