Skyworks Solutions Inc. SI5338Q-B04142-GMR

Overview

SI5338Q-B04142-GMR from Skyworks Solutions is a quad-output, I²C-programmable clock generator implementing MultiSynth™ frequency synthesis with 0 ppm precision per output, 0.7 ps RMS typical phase jitter, PCIe Gen 1–4 Common Clock and Gen 3 SRNS compliance, and support for LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL outputs up to 710 MHz. It replaces multiple crystal oscillators in high-speed serial interface timing applications such as PCIe root complexes and FPGA clock trees.

For engineers reviewing the SI5338Q-B04142-GMR datasheet, SI5338Q-B04142-GMR pinout, SI5338Q-B04142-GMR application, or SI5338Q-B04142-GMR equivalent, key selection criteria include differential output jitter performance at 100 MHz HCSL (0.15–0.45 ps RMS for PCIe Gen 3/4), independent per-output voltage configuration (1.5/1.8/2.5/3.3 V), and programmable phase/frequency adjustment in <20 ps / 1 ppm steps.

Technical Context

The SI5338Q-B04142-GMR integrates a high-stability PLL-based synthesis stage followed by four independent MultiSynth™ fractional-N dividers, enabling simultaneous generation of four unrelated frequencies from a single reference. Its architecture supports both free-running synthesis and synchronous frequency translation modes.

Each output driver is fully configurable for signal format, termination voltage, spread-spectrum modulation (0.5–5.0% spread, 33–63 kHz rate), and phase offset (±45 ns range). Input flexibility includes external crystal (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), or differential (5–710 MHz) references.

Key Specifications

Pinout & Package

SI5338Q-B04142-GMR is housed in a 4 × 4 mm, 24-lead QFN package with exposed thermal pad. Pin assignments are fixed per the Si5338 family and validated for this variant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-output programmable clock generator applications.

Compared with Si5332A-D06189-GM and ICS853S01IAGLF, the SI5338Q-B04142-GMR uniquely balances full I²C programmability, PCIe Gen 4 SRNS compliance, and 4-output flexibility in a compact 4×4 mm QFN-making it optimal for cost-sensitive, space-constrained designs requiring field-upgradable timing.

Availability

SI5338Q-B04142-GMR is available at Aetrix Electronics and suitable for PCIe Gen 4 root complexes, FPGA-based compute accelerators, and telecom line cards requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for SI5338Q-B04142-GMR 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

Skyworks Solutions is a global leader in analog semiconductors, specializing in RF, timing, and connectivity solutions for infrastructure, automotive, and mobile markets.

The Si5338 product line delivers highly configurable, low-jitter clock generation for high-speed serial interfaces-including PCIe, Ethernet, Fibre Channel, and broadcast video-enabling consolidation of multiple timing sources into a single programmable device.

FAQ

What is the primary function of the SI5338Q-B04142-GMR?

The SI5338Q-B04142-GMR is an I²C-programmable quad-output clock generator using MultiSynth™ technology to synthesize any frequency from 0.16 MHz to 710 MHz on each output with 0 ppm precision. It serves as a replacement for up to four discrete crystal oscillators in applications like PCIe timing, FPGA clocking, and telecom line cards, and is validated for PCIe Gen 1–4 Common Clock and Gen 3 SRNS compliance.

Does the SI5338Q-B04142-GMR support PCIe Gen 4 timing requirements?

Yes, the SI5338Q-B04142-GMR meets PCIe Gen 4 Common Clock jitter specifications with 0.15–0.45 ps RMS (12 kHz–20 MHz) when configured per Skyworks' recommended settings: 100 MHz HCSL outputs, PLL bandwidth of 2–4 MHz, and CDR = 10 MHz. This is verified in Table 12 of the official datasheet and supported by the Skyworks PCIe Clock Jitter Tool.

How many independent output voltage supplies does the SI5338Q-B04142-GMR support?

The SI5338Q-B04142-GMR supports four independent output buffer supply voltages-VDDO0 through VDDO3-each configurable for 1.5 V, 1.8 V, 2.5 V, or 3.3 V. This allows mixed-signal systems (e.g., interfacing LVDS FPGA I/O with HCSL SerDes) to drive different logic families from a single SI5338Q-B04142-GMR without level-shifting components.

Can the SI5338Q-B04142-GMR generate two frequencies above 350 MHz simultaneously?

Yes, the SI5338Q-B04142-GMR can generate two unique frequencies above 350 MHz simultaneously-specifically Fvco/4 and Fvco/6-as stated in Note 6 of Table 6. This capability enables dual high-speed SerDes lanes (e.g., 473.33 MHz and 367 MHz) from one device, but more than two >350 MHz outputs are not supported per the Si5338 architecture.

What software tools are available to configure the SI5338Q-B04142-GMR?

Skyworks provides ClockBuilder Pro-a free, GUI-based configuration tool-for the SI5338Q-B04142-GMR. It enables full I²C register setup, jitter simulation, spread-spectrum parameterization, and export of configuration files for production programming. The tool also supports real-time validation against PCIe, Ethernet, and broadcast video timing standards.