Skyworks Solutions Inc. SI5338M-B05142-GM

Overview

SI5338M-B05142-GM from Skyworks Solutions is a quad-output, I²C-programmable clock generator implementing MultiSynth™ frequency synthesis. It delivers four independent, any-frequency differential or single-ended clocks (0.16–710 MHz), supports PCIe Gen 1–4 common clock and SRNS modes, achieves 0.7 ps RMS typical phase jitter, and operates from 1.8/2.5/3.3 V core supply in a 4×4 mm 24-QFN package for FPGA and processor clocking applications.

For engineers reviewing the SI5338M-B05142-GM datasheet, SI5338M-B05142-GM pinout, SI5338M-B05142-GM application, or SI5338M-B05142-GM equivalent, this page provides verified technical context, pin-level circuit roles, PCIe- and Ethernet-compliant jitter performance, output format flexibility (LVPECL/LVDS/HCSL/CMOS/SSTL), and validated alternative options for multi-clock system design.

Technical Context

The SI5338M-B05142-GM integrates a high-stability PLL with two-stage MultiSynth™ synthesis: first-stage PLL locks to an input reference (8–30 MHz crystal or 5–710 MHz differential/CMOS/SSTL/HSTL), second-stage fractional-N dividers generate independent output frequencies. Each of four output drivers supports configurable voltage (1.5–3.3 V), format, and spread-spectrum modulation (0.5–5.0% at 33–63 kHz).

It features loss-of-lock and loss-of-signal monitoring, programmable initial phase offset (±45 ns), glitchless frequency increment/decrement in 1 ppm steps, and <20 ps phase step resolution. The device supports external feedback for zero-delay mode and includes dedicated interrupt (INTR) and I²C (SCL/SDA) control pins for real-time configuration.

Key Specifications

Pinout & Package

SI5338M-B05142-GM uses a 24-lead QFN package (4 mm × 4 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments are fixed per Si5338 family specification.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SI5338M-B05142-GM, Si5332A-D05142-GM offers higher channel count and lower jitter but increases BOM cost and design complexity, while ICS8430I-01LG reduces cost and footprint but sacrifices programmability, PCIe compliance, and multi-format flexibility.

Availability

SI5338M-B05142-GM is available at Aetrix Electronics and suitable for Ethernet switch/router, PCIe Gen 3/4 server platforms, and broadcast video timing applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for SI5338M-B05142-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 infrastructure, automotive, and industrial markets.

The Si5338 product line was designed as a highly configurable, low-jitter clock generator family for replacing multiple discrete oscillators in FPGA, processor, and high-speed serial interface applications-emphasizing PCIe, Ethernet, and broadcast timing compliance.

FAQ

What is the primary function of the SI5338M-B05142-GM?

The SI5338M-B05142-GM is a quad-output, I²C-programmable clock generator that synthesizes four independent, any-frequency clocks (0.16–710 MHz) using Skyworks' MultiSynth™ technology. It replaces up to four discrete oscillators, supports PCIe Gen 1–4 and Ethernet timing standards, and delivers 0.7 ps RMS typical phase jitter in a 4×4 mm QFN package.

Does the SI5338M-B05142-GM support PCIe Gen 4 common clock compliance?

Yes, the SI5338M-B05142-GM meets PCIe Gen 4 common clock jitter requirements with 0.15–0.45 ps RMS (10 kHz–50 MHz) when configured per spec-verified using the Skyworks PCIe Clock Jitter Tool and Intel Clock Jitter Tool v1.6.4. It requires HCSL output format and appropriate PLL bandwidth (2–4 or 2–5 MHz) with CDR = 10 MHz.

Can the SI5338M-B05142-GM generate different output formats simultaneously?

Yes, the SI5338M-B05142-GM supports mixed output formats: for example, CLK0A/B as LVDS (156.25 MHz), CLK1A/B as HCSL (100 MHz), CLK2A/B as LVPECL (250 MHz), and CLK3A/B as CMOS (50 MHz). Each output pair has independent VDDOx supply and format register control, enabling heterogeneous clock distribution without external translators.

What reference inputs does the SI5338M-B05142-GM accept?

The SI5338M-B05142-GM accepts multiple reference types: 8–30 MHz crystal (differential), 5–200 MHz CMOS (single-ended), 5–350 MHz SSTL/HSTL (single-ended), or 5–710 MHz differential (AC-coupled with external 100 Ω termination). Input flexibility allows use with existing system clocks or low-cost crystals without additional buffering.

How is the SI5338M-B05142-GM programmed and configured?

The SI5338M-B05142-GM is programmed via its I²C/SMBus-compatible interface (SCL/SDA pins) using Skyworks' ClockBuilder Pro software. Configuration includes output frequencies, formats, voltages, spread-spectrum settings, phase offsets, and alarm thresholds. Pre-programmed OTP versions are also available; field reprogramming is supported without hardware changes.