ICS9FG104CGLFT

Overview

The ICS9FG104CGLFT is a frequency timing generator designed for Intel CPU servers, PCI Express (PCIe), and SATA applications. It synthesizes output frequencies from a 14.31818 MHz or 25 MHz crystal input, or an external reference clock. The device provides four differential HCSL output pairs compliant with the Intel CK410 specification, alongside a single REFOUT pin. It supports maximum output frequencies up to 400 MHz with cycle-to-cycle jitter under 50 ps and output-to-output skew under 35 ps. Operating on a 3.135V to 3.465V supply within a 28-TSSOP package, it features spread spectrum capabilities and SMBus control.

Feature Summary

• Generates four differential 0.7V current-mode output pairs compliant with Intel CK410 specifications.
• Supports PCIe Gen 2, SATA at 100 MHz, QPI, and FBD architectures.
• Features two spread spectrum modes: 0 to -0.5% downspread and +/-0.25% centerspread.
• Provides programmable frequency selection via strap pins or SMBus interface.

Applications

• Intel CPU Server platforms
• PCI Express (PCIe) systems
• SATA storage interfaces

Procurement Notes

Verify component authenticity through authorized Renesas Electronics distributors. Confirm RoHS compliance status as indicated by the 'LF' suffix in the ordering code. Ensure the specific package variant matches the required PCB footprint, as the datasheet documents both SSOP and TSSOP options.

Selection Notes

Select this model when a fixed-frequency generator for PCIe Gen 2 and SATA is required. Verify that the application utilizes either a 14.31818 MHz or 25 MHz crystal input. Confirm that the 28-TSSOP package dimensions fit the design constraints and that the 3.3V logic levels are compatible with the target system voltage.

Part Context

This component belongs to the IDT/ICST family of frequency generators. Originally manufactured by Integrated Device Technology (IDT), the product line was acquired by Renesas Electronics Corporation. The part number prefix may appear as ICS9FG104 or 9FG104 depending on the documentation source.

Replacement Considerations

Consult official Renesas cross-reference documentation for verified substitutes. Generic replacements must match the 28-pin TSSOP package, 400 MHz maximum frequency, and HCSL differential output signaling requirements.

FAQ

What are the supported input frequencies?

The device accepts a 14.31818 MHz or 25 MHz crystal input, or an external reference clock signal.

How is the output frequency selected?

Frequency selection is accomplished via hardware strap pins (FS0-FS3) or through the SMBus serial interface.

What is the maximum output frequency?

The maximum synthesized output frequency is 400 MHz.