CY28409OXCT

Application Specific Clock/Timing Overview

The CY28409OXCT is a clock synthesizer and frequency synchronizer manufactured by Infineon Technologies, housed in a 56-lead BSSOP package. Designed for Intel CPU server applications, it supports LVTTL and crystal inputs to generate multiple clock outputs including differential CPU, SRC, PCI, 3V66, and USB frequencies. The device operates on a 3.135V to 3.465V supply voltage within an ambient temperature range of 0°C to 70°C. It features integrated PLLs and I2C support for configuration.

Application Specific Clock/Timing Feature Summary

• Supports selectable CPU frequencies up to 400MHz via FS_A/FS_B pins or SMBus
• Generates ten copies of PCI clocks, five copies of 3V66, and two copies of 48-MHz USB clocks
• Provides three differential CPU clock pairs and one differential SRC clock
• Includes I2C support with readback capabilities for flexible configuration

Application Specific Clock/Timing Applications

• Intel Pentium 4-type CPU servers
• System clock generation for high-performance processors
• PCI bus clock distribution

Application Specific Clock/Timing Procurement Notes

Verify the specific ordering suffix 'OXCT' against official Infineon documentation to confirm the exact package type (56-BSSOP) and tape-and-reel packaging details. Confirm RoHS compliance status and check for any product change notices (PCN) related to this discontinued part number before procurement planning.

Application Specific Clock/Timing Selection Notes

Select the CY28409OXCT when designing systems requiring precise clock synchronization for Intel architecture CPUs. Ensure the design accommodates the required 3.3V power rails and utilizes parallel resonance crystals as specified in the datasheet. Verify that the 56-lead SSOP/BSSOP footprint matches the PCB layout constraints.

Application Specific Clock/Timing Part Context

This component belongs to the CY28409 series of clock synthesizers originally developed by Cypress Semiconductor Corporation and later acquired by Infineon Technologies. The series is engineered specifically for supporting Intel Pentium 4-type processors, providing comprehensive clocking solutions for server and workstation platforms.

Application Specific Clock/Timing Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.