Skyworks Solutions Inc. SI5338C-B05575-GM

Overview

SI5338C-B05575-GM from Skyworks Solutions is a quad-output, I²C-programmable clock generator with MultiSynth™ frequency synthesis, delivering four independent low-jitter clocks (0.7 ps RMS typ) across LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL formats, supporting PCIe Gen 1–4 and Ethernet timing in telecom line cards and FPGA-based systems.

For engineers reviewing the SI5338C-B05575-GM datasheet, SI5338C-B05575-GM pinout, SI5338C-B05575-GM application, or SI5338C-B05575-GM equivalent, key selection considerations include its 4× differential output capability, 0 ppm synthesis accuracy, 24-pin 4×4 mm QFN package, and support for external crystal (8–30 MHz), CMOS (5–200 MHz), or differential inputs (5–710 MHz).

Technical Context

The SI5338C-B05575-GM integrates a dual-stage PLL architecture: a high-stability reference stage followed by four independent MultiSynth™ fractional-N synthesizers, each feeding a configurable output driver. It supports both free-running synthesis and synchronous frequency translation modes.

Each output driver is independently programmable for voltage (1.5/1.8/2.5/3.3 V), format (LVPECL up to 710 MHz, LVDS up to 350 MHz, HCSL up to 250 MHz, CMOS up to 200 MHz), phase offset (±45 ns, <20 ps step), and spread-spectrum control (0.5–5.0% spread, 33–63 kHz modulation).

Key Specifications

Pinout & Package

SI5338C-B05575-GM is housed in a 24-lead, 4 mm × 4 mm QFN package with wettable flanks and an exposed thermal pad. Pin 1 is top-left corner (IN1), pin 24 is bottom-right (GND). The package supports reflow soldering per JEDEC J-STD-020 (peak 260 °C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5332A-D05575-GM, SI5338C-B05575-GM offers full 4-output programmability and broader input flexibility at higher power and jitter; versus ICS853S02IAGLF, it provides synthesis, format agility, and dynamic tuning-making it essential for evolving multi-standard platforms.

Availability

SI5338C-B05575-GM is available at Aetrix Electronics and suitable for PCIe Gen 4 switch timing, Ethernet switch clocking, and FPGA-based broadcast video sync requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for SI5338C-B05575-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 semiconductor company specializing in analog and mixed-signal connectivity solutions for wireless, broadband, automotive, and industrial markets.

The Si5338 product line was designed specifically for high-performance, software-configurable clock generation in multi-standard communication systems-enabling consolidation of discrete oscillators and simplifying timing architecture in FPGA, ASIC, and network processor platforms.

FAQ

What is the primary function of the SI5338C-B05575-GM?

The SI5338C-B05575-GM is a quad-output, I²C-programmable clock generator using Skyworks' MultiSynth™ technology to synthesize any frequency on each of its four differential outputs with 0 ppm precision. It replaces up to four discrete oscillators and supports PCIe Gen 1–4, Ethernet, and telecom timing standards. Its role in system design is to provide flexible, low-jitter clock sources with independent format, voltage, and phase control per output channel.

Does the SI5338C-B05575-GM support PCIe Gen 4 compliance?

Yes, the SI5338C-B05575-GM meets PCIe Gen 4 common clock jitter requirements: RMS jitter ≤0.45 ps (12 kHz–20 MHz) and total jitter ≤33.6 ps pk-pk under specified test conditions (100 MHz HCSL outputs, PLL BW 2–5 MHz, CDR = 10 MHz). This compliance is verified per PCI Express Base Specification 4.0 rev. 0.5 and confirmed using the Skyworks PCIe Clock Jitter Tool.

What input reference options does the SI5338C-B05575-GM support?

The SI5338C-B05575-GM accepts multiple reference types: an 8–30 MHz fundamental-mode crystal on IN1/IN2; single-ended CMOS clocks (5–200 MHz) on IN3/IN4; SSTL/HSTL inputs (5–350 MHz); or differential inputs (5–710 MHz) on IN1/IN2 or IN5/IN6. Each input path includes dedicated loss-of-signal detection with configurable thresholds and response times.

How is output voltage configured on the SI5338C-B05575-GM?

Output voltage is set per output bank (VDDO0–VDDO3) using external supply rails-each independently configurable for 1.5 V, 1.8 V, 2.5 V, or 3.3 V. This allows mixed-voltage operation (e.g., LVDS at 2.5 V and HCSL at 1.8 V simultaneously) without level-shifting components. The core VDD supply (1.8/2.5/3.3 V) is separate and powers internal logic and PLL circuitry.

Can the SI5338C-B05575-GM generate spread-spectrum clocks?

Yes, the SI5338C-B05575-GM supports fully programmable spread-spectrum clocking (SSC) on any output: spread depth adjustable from 0.5% to 5.0%, modulation rate from 33 kHz to 63 kHz, and center-spread or down-spread modes. SSC configuration is performed via I²C registers and can be enabled/disabled dynamically during operation without interrupting clock output.