Renesas 9FGL0451DKILFT

Overview

9FGL0451DKILFT from Renesas Electronics is a 3.3V PCIe Gen1–5 clock generator with four differential 100MHz HCSL output pairs, dedicated OE# pins per output for PCIe CLKREQ# support, and one 3.3V LVCMOS REF output with Wake-on-LAN capability. It operates in Common Clocked (CC) and Independent Reference (IR) architectures with SRIS/SRNS spread spectrum options, targeting high-speed server and storage platforms.

For engineers reviewing the 9FGL0451DKILFT datasheet, 9FGL0451DKILFT pinout, 9FGL0451DKILFT application, or 9FGL0451DKILFT equivalent, key selection criteria include PCIe Gen5-compliant 90fs RMS jitter (CC mode), <50ps cycle-to-cycle and output-to-output skew, integrated 85Ω/100Ω terminations, SMBus-configurable slew rate/amplitude/impedance, and 5×5 mm 32-VFQFPN packaging with 0.5 mm pitch.

Technical Context

The 9FGL0451DKILFT implements a low-jitter PLL architecture optimized for PCIe Gen5 Common Clocked systems, delivering ±0 ppm synthesis error on all differential outputs and supporting clean switching between CC/SRIS spread settings without system reset. Its input accepts a 25MHz crystal or reference clock via XIN/CLKIN_25.

It features four independent OE# control inputs (vOE0#–vOE3#), each with internal 120kΩ pull-down resistors, enabling per-output enable/disable for dynamic power management. The device includes default configuration storage, eliminating mandatory SMBus initialization while retaining full configurability via SMBus-selectable features including input polarity, output impedance (85Ω or 100Ω), and spread spectrum selection.

Key Specifications

Pinout & Package

9FGL0451DKILFT is housed in a 5×5 mm 32-VFQFPN package with exposed thermal pad (EPAD) connected to GND. Pin assignments follow the 9FGL04x1D layout (Figure 3, datasheet R31DS0112EU0103 Rev.1.03), featuring 32 leads on 0.5 mm pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PCIe clock generator applications.

Compared with IDT8T49N242BGI8 and Si5332A-D06704-GM, the 9FGL0451DKILFT delivers PCIe Gen5-ready jitter performance in a smaller 5×5 mm package with zero-configuration startup and integrated terminations-making it optimal for Gen5 server/storage designs prioritizing simplicity, density, and compliance.

Availability

9FGL0451DKILFT is available at Aetrix Electronics and suitable for PCIe Gen5 server backplanes, NVMe storage arrays, and AI accelerator racks requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for 9FGL0451DKILFT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Renesas Electronics is a global semiconductor leader specializing in microcontrollers, analog, power, and timing solutions for automotive, industrial, and datacenter applications.

The 9FGL04x1D product line is designed specifically for PCIe Gen1–5 clocking in high-density computing infrastructure, emphasizing low jitter, flexible spread spectrum, and simplified system integration through integrated terminations and default configuration.

FAQ

What is the primary PCIe generation supported by the 9FGL0451DKILFT?

The 9FGL0451DKILFT is fully compliant with PCIe Gen1 through Gen5 specifications. Its 90fs RMS typical phase jitter in Common Clocked architecture meets the PCIe Gen5 requirement of ≤150fs RMS, and it supports both CC and SRIS/SRNS timing architectures required across all generations.

Does the 9FGL0451DKILFT require SMBus configuration to operate?

No, the 9FGL0451DKILFT contains factory-programmed default configuration and operates immediately after power-up without SMBus initialization. SMBus is optional and used only to modify output slew rate, amplitude, impedance, or spread spectrum settings beyond defaults.

What package type and dimensions does the 9FGL0451DKILFT use?

The 9FGL0451DKILFT uses a 32-pin Very Thin Quad Flat No-lead (VFQFPN) package measuring 5 mm × 5 mm with 0.5 mm pitch and an exposed thermal pad (EPAD) connected to GND, as specified in the 9FGL04x1D pin assignment diagram (Figure 3, R31DS0112EU0103 Rev.1.03).

How does the 9FGL0451DKILFT support PCIe CLKREQ# functionality?

The 9FGL0451DKILFT provides four dedicated active-low output enable pins (vOE0#–vOE3#), each with internal 120kΩ pull-down resistors. These pins directly interface with PCIe slot CLKREQ# signals, allowing per-lane clock gating in compliance with PCIe power management protocols.

Can the 9FGL0451DKILFT generate spread spectrum clocking, and how is it configured?

Yes, the 9FGL0451DKILFT supports −0.5% spread (pin-selectable via ^vSS_EN_tri), −0.25% spread (SMBus-selectable), and 0% spread (SRNS). Configuration occurs at power-up via ^vSS_EN_tri latching or dynamically via SMBus Byte 1, with clean switching between modes without system reset.