9FGU0831CKLFT

Overview

The 9FGU0831CKLFT is an obsolete clock generator from Renesas Electronics, formerly part of the IDT portfolio. It belongs to the 1.5 V ultra-low-power PCIe clock family designed for PCI Express Gen 1, 2, and 3 applications. The device features eight LP-HCSL outputs with programmable slew rates and amplitudes. It operates within a temperature range of -40°C to +85°C and utilizes a 48-pin VFQFPN package (6x6 mm). Key electrical characteristics include a typical power consumption of 50 mW and support for spread spectrum modulation to reduce EMI.

Feature Summary

• Eight LP-HCSL outputs that eliminate the need for external series resistors typically required by standard PCIe devices.
• Ultra-low power consumption of approximately 50 mW, reducing thermal management requirements.
• Programmable output slew rate and amplitude tuning to accommodate various trace lengths and application environments.
• Supports selectable spread spectrum frequencies of 0%, -0.25%, or -0.5% for EMI reduction.

Applications

• PCI Express Gen 1, 2, and 3 clock generation for server and storage motherboards.
• High-speed digital systems requiring low-jitter clock distribution with minimal power dissipation.
• Embedded systems utilizing legacy SMBus configuration without requiring complex programming interfaces.

Procurement Notes

This component is officially listed as obsolete and no longer in production. Availability is restricted to existing stock held by distributors or secondary market suppliers. Verification of authenticity and lot traceability is critical when sourcing from non-authorized channels. Designers should consider the long-term supply risks associated with end-of-life components for new projects.

Selection Notes

Select this device only for maintenance upgrades or replacements of existing designs using the IDT/Renesas 1.5V PCIe clock family. Ensure compatibility with the system's SMBus addressing and crystal oscillator requirements. For new designs, evaluate current Renesas alternatives such as the 9FGU0841 series or other modern clock generators that offer active manufacturing status and updated feature sets.

Part Context

The 9FGU0831CKLFT is the tape-and-reel variant of the 9FGU0831CKILF tray-packaged unit. Both share identical electrical specifications and functionality. The suffix 'LFT' indicates lead-free packaging and reel shipping format. This part is part of the broader 9FGU0831 family, which includes variants with different temperature ranges and packaging options.

Replacement Considerations

Public documentation identifies the 9FGU0841AKLFT as a potential replacement within the same manufacturer's portfolio. Verify pinout compatibility and electrical parameters against the original design requirements before substitution. Other members of the 9FGU0831 family may serve as functional equivalents if packaging constraints allow.