CY28RS480OXC

Application Specific Clock/Timing Overview

The CY28RS480OXC is a processor-specific clock generator designed for the ATI RS480 chipset and AMD CPU platforms. It operates on a 3.3V supply (3.135V to 3.465V) within a commercial temperature range of 0°C to 70°C. The device features two PLLs and generates multiple clock outputs, including 200-MHz differential CPU pairs, 100-MHz differential SRC clocks, 66-MHz HyperTransport, 33-MHz PCI, 48-MHz USB, and 14.318-MHz reference clocks. It utilizes a 56-pin SSOP package and supports I2C configuration with spread spectrum capabilities.

Application Specific Clock/Timing Feature Summary

• Generates specific clock signals for ATI RS480 chipset and AMD CPUs, including 200MHz CPU and 100MHz SRC differential pairs.
• Includes integrated I2C interface for register configuration and readback capabilities.
• Supports Lexmark spread spectrum profile for EMI reduction with selectable -0.35% or -0.50% deviation.
• Features CLKREQ# inputs for clean stopping and starting of selected serial reference clock outputs.

Application Specific Clock/Timing Applications

• ATI RS480 Chipset Clock Generation
• AMD CPU Platform Timing
• HyperTransport Interface Clocking

Application Specific Clock/Timing Procurement Notes

Verify component authenticity as Infineon acquired Cypress Semiconductor. Confirm package type matches the 'OXC' suffix (56-pin SSOP). Check for lead-free compliance documentation corresponding to the manufacturing date code. Ensure system design accounts for the commercial temperature grade limits.

Application Specific Clock/Timing Selection Notes

Select this part specifically for ATI RS480 based designs requiring fixed frequency outputs. Verify crystal loading calculations using parallel resonance crystals at 14.31818 MHz. Ensure power supply sequencing does not exceed input voltage limits relative to VDD during power-up. Consider the 56-pin SSOP footprint constraints for PCB layout.

Application Specific Clock/Timing Part Context

This component belongs to the CY28RS series of processor-specific clock generators originally manufactured by Cypress Semiconductor. Following Infineon Technologies' acquisition of Cypress, these products are managed under Infineon's portfolio. The device is optimized for legacy PC chipset timing requirements rather than general-purpose synthesis.

Application Specific Clock/Timing Replacement Considerations

Public confirmed substitute part numbers: CY28RS480OXCT (Tape and Reel version), CY28RS480ZXC (56-pin TSSOP), CY28RS480ZXCT (TSSOP Tape and Reel).