ICS9FG104DFLFT

Overview

The ICS9FG104DFLFT is a frequency timing generator manufactured by Renesas Electronics Corporation, originally developed under the IDT brand. It provides four differential output pairs compliant with Intel CK410 specifications, supporting CPU, QPI, FBD, PCIe Gen 2, and SATA applications. The device synthesizes frequencies from 14.318 MHz or 25 MHz crystal inputs, delivering outputs with cycle-to-cycle jitter under 50 ps and output-to-output skew under 35 ps. It operates on a 3.135V to 3.465V supply within a 0°C to +70°C commercial temperature range, housed in a 28-pin SSOP package.

Feature Summary

• Generates four 0.7V current-mode differential output pairs compliant with Intel CK410.
• Supports spread spectrum modes: 0 to -0.5% downspread and +/-0.25% centerspread.
• Features SMBus control for frequency selection and configuration.
• Provides cycle-to-cycle jitter less than 50 ps and output-to-output skew less than 35 ps.

Applications

• Intel CPU Server clock generation
• PCI Express (PCIe) Gen 2 reference clocks
• SATA interface timing at 100 MHz

Procurement Notes

Verify the ordering suffix 'FLFT' corresponds to the Tape and Reel packaging variant of the 9FG104D series. Confirm the 'D' designation aligns with the commercial operating temperature range of 0°C to +70°C. Ensure compatibility with the 28-pin SSOP footprint during procurement planning.

Selection Notes

Select this component when designing systems requiring compliance with Intel CK410 specifications for PCIe Gen 2 or SATA. Choose the 'DFLFT' variant over 'DFLF' if surface-mount reflow assembly via tape and reel is required. Verify that the input source matches the 14.318 MHz or 25 MHz crystal requirements supported by the SEL14M_25M# pin configuration.

Part Context

This part belongs to the 9FG104 family of frequency generators. The 'D' suffix indicates the commercial temperature grade (0 to +70°C), while 'F' denotes lead-free/RoHS compliance. The 'LFT' suffix specifies the tape and reel shipping method. The device was originally an IDT product before integration into Renesas Electronics.

Replacement Considerations

The 9FG104DFILFT serves as the industrial temperature grade replacement (-40 to +85°C). For TSSOP package variants, consider the 9FG104DGLFT series. Direct functional substitution requires verifying thermal operating ranges and package dimensions against the existing PCB layout.

FAQ

What are the supported spread spectrum modes?

The device supports two spread spectrum modes: 0 to -0.5% downspread and +/-0.25% centerspread.

How is the input frequency selected?

Input frequency selection between 14.31818 MHz and 25 MHz is accomplished via the SEL14M_25M# pin or through SMBus software control.

What is the maximum cycle-to-cycle jitter specification?

The differential output pairs guarantee a cycle-to-cycle jitter of less than 50 ps.