Skyworks Solutions Inc. SI5338C-B05394-GM

Overview

SI5338C-B05394-GM from Skyworks Solutions is a quad-output, I²C-programmable clock generator with MultiSynth™ frequency synthesis, delivering four independent differential or single-ended clocks (0.16–710 MHz), 0.7 ps RMS typical phase jitter, and PCIe Gen 1/2/3/4 Common Clock & Gen 3 SRNS compliance. It replaces up to four crystal oscillators in high-speed serial interface timing applications.

For engineers reviewing the SI5338C-B05394-GM datasheet, SI5338C-B05394-GM pinout, SI5338C-B05394-GM application, or SI5338C-B05394-GM equivalent, key selection criteria include output format flexibility (LVPECL/LVDS/HCSL/CMOS/SSTL), independent per-output voltage (1.5–3.3 V), spread-spectrum capability (0.5–5.0% down-spread), and zero-ppm synthesis accuracy across all outputs.

Technical Context

The SI5338C-B05394-GM implements a two-stage PLL architecture: a high-stability reference stage (with crystal or external clock input) followed by four independent MultiSynth™ fractional-N synthesis blocks. Each output driver supports programmable format, voltage, and phase offset (<20 ps step resolution), enabling glitchless frequency adjustment in 1 ppm increments.

It accepts six input references - including 8–30 MHz crystal, 5–200 MHz CMOS, 5–350 MHz SSTL/HSTL, and 5–710 MHz differential - and provides loss-of-lock and loss-of-signal alarms. The device operates across –40 to +85 °C with core supply options of 1.8 V, 2.5 V, or 3.3 V and output buffer supplies from 1.4 V to 3.63 V.

Key Specifications

Pinout & Package

SI5338C-B05394-GM is housed in a 24-lead, 4 × 4 mm QFN package with an exposed thermal pad (pin 24). Pin assignments are standardized across the Si5338 family and validated per Skyworks Rev. 1.6 datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5338A-B-GM, SI5338C-B05394-GM delivers identical silicon functionality but ships with factory-tuned NVM settings for PCIe Gen 3/4 and 10GbE timing; versus ICS853S02AGILF, it provides full programmability, lower jitter, and mixed-signal flexibility at the cost of configuration effort.

Availability

SI5338C-B05394-GM is available at Aetrix Electronics and suitable for PCIe Gen 4 server backplanes, 10 GbE switch/router timing, and broadcast video equipment requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for SI5338C-B05394-GM 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 and mixed-signal semiconductors, specializing in RF, timing, and connectivity solutions for infrastructure, automotive, and mobile markets.

The Si5338 product line was designed for high-performance, multi-protocol clock generation in data center, telecom, and broadcast systems-emphasizing low jitter, flexible output configuration, and PCIe/10GbE compliance.

FAQ

What is the default output configuration of the SI5338C-B05394-GM?

The SI5338C-B05394-GM ships with factory-programmed NVM settings optimized for PCIe Gen 3/4 and 10GbE applications, including 100 MHz HCSL on CLK0A/B and 125 MHz LVDS on CLK1A/B. All outputs retain full I²C reprogrammability via ClockBuilder Pro software, and the default configuration can be overwritten to meet custom frequency or format requirements.

Does the SI5338C-B05394-GM support spread spectrum clocking (SSC)?

Yes, the SI5338C-B05394-GM supports fully configurable spread spectrum on any output: modulation rates from 33 to 63 kHz, spread percentages from 0.5% to 5.0%, and selectable up/down-spread direction. This feature is implemented in hardware and does not require external components, making it effective for EMI reduction in dense PCB environments without impacting timing integrity.

Can the SI5338C-B05394-GM generate frequencies above 350 MHz?

Yes, the SI5338C-B05394-GM supports frequencies up to 710 MHz on LVPECL/LVDS/CML outputs. However, only two unique frequencies above 350 MHz may be generated simultaneously-specifically Fvco/4 and Fvco/6-due to internal VCO architecture constraints. This is documented in Section 3.3 of the datasheet and applies to all Si5338 variants, including SI5338C-B05394-GM.

What input reference options does the SI5338C-B05394-GM support?

The SI5338C-B05394-GM accepts six input reference types: 8–30 MHz crystal (differential), 5–200 MHz CMOS (single-ended on IN3/IN4), 5–350 MHz SSTL/HSTL (single-ended), and 5–710 MHz differential (on IN1/IN2 or IN5/IN6). All inputs are automatically detected and conditioned; no external biasing or termination is needed except for differential inputs, which require 100 Ω external termination.

Is the SI5338C-B05394-GM pin-compatible with other Si5338 variants?

Yes, all Si5338 variants-including SI5338C-B05394-GM-are fully pin-compatible and share identical 24-QFN packaging, pin assignments, and register maps. Differences exist only in factory-programmed NVM content (default frequencies, startup behavior), not in electrical or mechanical compatibility. Hardware designs using any Si5338 part can interchange SI5338C-B05394-GM without PCB changes.