Skyworks Solutions Inc. SI5338C-B06043-GMR

Overview

SI5338C-B06043-GMR from Skyworks Solutions is an I²C-programmable quad clock generator with four independently configurable differential or single-ended outputs, 0.7 ps RMS typical phase jitter, PCIe Gen 1–4 Common Clock and Gen 3 SRNS compliance, and operation from 1.8/2.5/3.3 V core supply in a 4 × 4 mm 24-QFN package. It replaces up to four crystal oscillators in Ethernet switch/router, FPGA clocking, and broadcast video timing systems.

For engineers reviewing the SI5338C-B06043-GMR datasheet, SI5338C-B06043-GMR pinout, SI5338C-B06043-GMR application, or SI5338C-B06043-GMR equivalent, key selection factors include its MultiSynth™-based any-frequency synthesis (0.16–710 MHz per output), independent output voltage per driver (1.5–3.3 V), 1 ppm frequency increment/decrement resolution, <20 ps phase step accuracy, and spread-spectrum control (0.5–5.0% deviation, 33–63 kHz modulation).

Technical Context

The SI5338C-B06043-GMR implements a two-stage PLL architecture: a high-stability integer-N Phase-Locked Loop (Stage 1) locks to one of six input references (crystal, CMOS, SSTL/HSTL, or differential), followed by four independent MultiSynth™ fractional-N synthesis blocks (Stage 2) generating each output. Each MultiSynth supports integer or fractional mode with ≤1 ppb frequency resolution.

Its output stage provides per-driver configurability for LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL formats, independent VDDO supplies (1.4–3.63 V), and real-time dynamic adjustments via dedicated pins (PINC/FINC, OEB) or I²C-enabling glitchless frequency sweeps, programmable initial phase offset (±45 ns), and loss-of-lock/loss-of-signal alarms.

Key Specifications

Pinout & Package

SI5338C-B06043-GMR is housed in a 24-lead QFN package (4 × 4 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments are fixed across the Si5338 family and validated per Skyworks Rev. 1.6 datasheet (pages 2, 33–37).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SI5338C-B06043-GMR, the Si5338A-B-GM offers identical silicon and performance but requires full reconfiguration for PCIe or broadcast use cases, while the LMK04832 delivers lower jitter and more outputs at the cost of size, complexity, and non-interchangeable packaging.

Availability

SI5338C-B06043-GMR is available at Aetrix Electronics and suitable for Ethernet switch/router timing, PCIe Gen 3/4 clocking, and broadcast video/audio synchronization requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for SI5338C-B06043-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 semiconductor company specializing in analog and mixed-signal connectivity solutions for infrastructure, automotive, and industrial markets.

The Si5338 product line delivers programmable, low-jitter clock generation for high-speed serial interfaces-including PCIe, Ethernet, and broadcast video-where precise frequency synthesis and deterministic phase control are critical.

FAQ

What is the primary function of the SI5338C-B06043-GMR?

The SI5338C-B06043-GMR is an I²C-programmable quad clock generator that synthesizes up to four independent, low-jitter output frequencies from a single reference input. It replaces multiple fixed-frequency oscillators in systems requiring flexible, high-precision timing-such as PCIe root complexes, Ethernet switches, and broadcast video equipment-while supporting zero-ppm accuracy and real-time frequency/phase tuning.

Does the SI5338C-B06043-GMR support PCIe Gen 4 Common Clock compliance?

Yes, the SI5338C-B06043-GMR meets PCIe Gen 4 Common Clock jitter specifications with ≤0.45 ps RMS (12 kHz–20 MHz) when configured per Skyworks application note AN562. Its design includes optimized PLL loop bandwidth (2–5 MHz) and supports the required CDR filter profile, verified using the Skyworks PCIe Clock Jitter Tool and Intel Clock Jitter Tool v1.6.4.

How many output formats does the SI5338C-B06043-GMR support per channel?

The SI5338C-B06043-GMR supports five output signal formats per channel: LVPECL, LVDS, HCSL, CMOS, SSTL, and HSTL. Each output driver is independently configurable for format, frequency, voltage level (1.5/1.8/2.5/3.3 V), and termination-enabling mixed-signal interfacing across FPGAs, ASICs, and memory controllers without external level shifters.

Can the SI5338C-B06043-GMR generate frequencies above 350 MHz?

Yes, the SI5338C-B06043-GMR supports output frequencies up to 710 MHz, but only two unique frequencies above 350 MHz may be active simultaneously-specifically Fvco/4 and Fvco/6-as defined by the MultiSynth™ architecture. Higher frequencies require integer-mode synthesis and appropriate VCO calibration; operation beyond 350 MHz mandates differential output formats (LVPECL/LVDS/HCSL/CML).

What software tools are required to configure the SI5338C-B06043-GMR?

Configuration of the SI5338C-B06043-GMR is performed using Skyworks' ClockBuilder Pro software-a free, GUI-based tool that generates register maps, validates timing constraints, and exports configuration files for production programming. The tool supports I²C communication via USB-to-I²C adapters and includes built-in PCIe, Ethernet, and broadcast video templates aligned with the SI5338C-B06043-GMR's factory-programmed defaults.