SL28748ELIT

Application Specific Clock/Timing Overview

The SL28748ELIT is a non-volatile programmable clock generator designed for Intel Calpella chipsets, compliant with Intel CK505 Clock Revision 1.0 and PCI-Express Gen 2 standards. It features integrated voltage regulators and resistors on differential clocks. The device supports scalable VDD_IO from 3.3V to 1.05V and includes wireless-friendly slew rate control. Key outputs include dual differential CPU clocks (100MHz/133MHz), two 100MHz SRC/SATA clocks, a fixed 96MHz DOT clock, and 27MHz video clocks. It accepts a 14.318MHz crystal or clock input and utilizes EProClock technology for configuration via SMBus or hard coding.

Application Specific Clock/Timing Feature Summary

• Intel CK505 Rev 1.0 and PCI-Express Gen 2 Compliant
• EProClock Non-Volatile Programmable Technology with SMBus support
• Integrated Voltage Regulator and Differential Resistors
• Scalable VDD_IO (3.3V to 1.05V) and Wireless Friendly Slew Rate Control

Application Specific Clock/Timing Applications

• Intel Calpella Chipset Platforms
• PCI-Express Generation 2 Systems
• Desktop Motherboards requiring CK505 compliance

Application Specific Clock/Timing Procurement Notes

Verify the 'ELIT' suffix indicates the industrial temperature range (-40°C to 85°C) and Tape & Reel packaging format as specified in the ordering information table. Confirm that the component is sourced from Silicon Laboratories, the original manufacturer of the EProClock technology, despite Skyworks Solutions branding appearing in some distributor listings.

Application Specific Clock/Timing Selection Notes

Select this part for designs requiring fixed frequency generation for CPU, SATA, and display interfaces without external programming hardware. Ensure the system power supply sequencing allows for the CKPWRGD/PD# pin assertion within 10µs if immediate power-down state is required. Verify that the 32-pin QFN package dimensions (5x5mm) fit the PCB footprint constraints.

Application Specific Clock/Timing Part Context

This component belongs to the SL28748 family of EProClock generators. The 'EL' designation specifies the 32-pin QFN package and industrial temperature rating, while the 'IT' suffix denotes Tape and Reel packaging. It serves as a direct replacement for legacy discrete clock solutions in Intel Core 2 era architectures.

Application Specific Clock/Timing Replacement Considerations

Compatible substitutes within the same family include SL28748ELC (Commercial Temp, Tray), SL28748ELI (Industrial Temp, Tray), and SL28748ELCT (Commercial Temp, Tape & Reel). Cross-family replacements like SL28774 or SL28779 may share similar functionality but require verification of specific output frequencies and pin compatibility.