ICS9FG104DGLF

Overview

The ICS9FG104DGLF is a frequency timing generator manufactured by Renesas Electronics Corporation, 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 output pairs compliant with the Intel CK410 specification, featuring cycle-to-cycle jitter of less than 50 ps and output-to-output skew of less than 35 ps. It supports spread spectrum modes of 0 to -0.5% downspread and +/-0.25% centerspread. Operating at a maximum frequency of 400 MHz, it utilizes a 28-TSSOP package with a supply voltage range of 3.135V to 3.465V.

Feature Summary

• Provides four 0.7V current-mode differential output pairs compliant with Intel CK410 specifications.
• Supports Serial-ATA at 100 MHz and features two spread spectrum modes: 0 to -0.5% downspread and +/-0.25% centerspread.
• Delivers output cycle-to-cycle jitter of less than 50 ps and output-to-output skew of less than 35 ps.
• Allows frequency selection via strap pins or SMBus control, supporting inputs from 14.31818 MHz or 25 MHz crystals.

Applications

• Intel CPU Server clock generation
• PCI Express (PCIe) Gen 2 clocking
• SATA interface clocking

Procurement Notes

Verify that the component matches the specific ordering suffix 'GLFT' for the 28-TSSOP tape and reel packaging variant. Confirm the manufacturer designation as Renesas Electronics Corporation, noting the historical IDT branding in datasheets. Ensure the part meets RoHS compliance standards indicated by the 'LF' suffix. Cross-reference the DigiKey part number 800-2661-2-ND for accurate sourcing details.

Selection Notes

Select this component when designing systems requiring low-jitter differential clocks for PCIe Gen 2 and SATA interfaces. It is suitable for Intel CPU server architectures needing precise frequency synthesis from standard crystal references. Consider the 28-TSSOP package constraints and the requirement for a fixed precision resistor on the IREF pin for proper output impedance matching.

Part Context

The ICS9FG104D belongs to the 9FG104 family of frequency generators originally developed by Integrated Device Technology (IDT), now part of Renesas Electronics. This series is optimized for high-performance computing platforms, providing stable clock signals for processors and expansion buses. The 'D' revision indicates specific electrical characteristics and pin configurations documented in the 1541C datasheet.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. The ICS9FG104CGLFT is a related model but has different operating temperature ranges and status.