9LRS954A4GLFT

Overview

The 9LRS954A4GLFT is an obsolete clock synthesizer compliant with the CK410M standard, designed for mobile systems utilizing Intel P4-M processors and associated chipsets. It operates as a single-chip solution driven by an external 14.318MHz crystal to generate CPU outputs up to 400MHz. The device provides specific differential current-mode pairs including two 0.7V CPU pairs, one SRC pair for SATA/PCIe, and selectable CPU/SRC or LCD/SRC pairs. It supports PCI (33MHz), USB (48MHz), and DOT (96MHz) outputs. Key performance metrics include cycle-cycle jitter of less than 85ps for CPU, less than 125ps for SRC, and less than 500ps for PCI, alongside frequency accuracy specifications.

Feature Summary

• Generates high-frequency CPU clocks up to 400MHz from a 14.318MHz reference
• Provides tight ppm accuracy required for Serial ATA and PCI-Express interfaces
• Supports programmable spread spectrum functionality for EMI reduction
• Integrates undriven differential pairs for power management control

Applications

• Mobile systems based on Intel P4-M processors
• Intel mobile chipset platforms
• Clock synthesis for Serial ATA interfaces
• Clock synthesis for PCI-Express interfaces

Procurement Notes

This component is officially listed as Obsolete by Renesas Electronics Corporation. Availability is limited to existing stock or third-party surplus markets; direct new production supply is not available. Verify part authenticity and condition carefully when sourcing from distributors. Ensure compatibility with legacy Intel P4-M architectures before procurement. No active manufacturing support or warranty from the original manufacturer applies to this discontinued item.

Selection Notes

Select this component only for legacy designs requiring exact CK410M compliance and Intel P4-M processor timing. Consider modern alternatives if migrating to newer mobile or desktop platforms. Verify that the TSSOP-56 package fits the target PCB layout. Confirm that the 14.318MHz crystal requirement aligns with the system's reference clock infrastructure. Evaluate whether the specific jitter and accuracy specs meet the design constraints for SATA and PCIe links.

Part Context

The 9LRS954A4GLFT belongs to the 9LRS9 series of clock generators, specifically tailored for mobile computing applications during the era of Intel Pentium M processors. It serves as a critical timing element in motherboard designs requiring precise synchronization between CPU, memory, and peripheral buses. Its obsolescence reflects the transition away from P4-M architecture toward newer generations of mobile processors with integrated clocking capabilities.

Replacement Considerations

No public confirmed substitute part numbers are documented for this obsolete component. Designers must evaluate pin-compatible or functionally equivalent clock synthesizers from other manufacturers or consider platform-level redesigns to accommodate modern timing ICs.