Skyworks Solutions Inc. SI5338Q-B04142-GM

Overview

SI5338Q-B04142-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 typical phase jitter), PCIe Gen 1–4 and SRNS-compliant outputs, and support for LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL formats across 0.16–710 MHz. It replaces up to four crystal oscillators in high-speed networking and FPGA timing applications.

For engineers reviewing the SI5338Q-B04142-GM datasheet, SI5338Q-B04142-GM pinout, SI5338Q-B04142-GM application, or SI5338Q-B04142-GM equivalent, this page provides verified technical context, exact pin functions, real-world use cases, and validated alternative options - all grounded in Skyworks Rev. 1.6 documentation and official package data.

Technical Context

The SI5338Q-B04142-GM implements a two-stage PLL architecture: a high-stability reference stage followed by four independent MultiSynth™ fractional-N synthesizers, each driving configurable output buffers. Its input supports differential (5–710 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), or crystal (8–30 MHz) references.

All four outputs are independently programmable for frequency, format, voltage (1.5/1.8/2.5/3.3 V), phase offset (±45 ns, <20 ps step), and spread-spectrum modulation (0.5–5.0% spread, 33–63 kHz rate). Loss-of-lock and loss-of-signal alarms provide system-level monitoring via the INTR pin.

Key Specifications

Pinout & Package

SI5338Q-B04142-GM uses a 24-lead QFN package (4 mm × 4 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments follow Skyworks Rev. 1.6 pinout diagram and functional block diagram.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5338A-B04142-GM, the SI5338Q-B04142-GM offers identical hardware but guarantees factory-loaded configuration for immediate operation; versus LMK04832RHAT, it delivers lower power and smaller footprint at the cost of fewer outputs and no JESD204B support.

Availability

SI5338Q-B04142-GM is available at Aetrix Electronics and suitable for PCIe Gen 4 server boards, 10/25 GbE switching platforms, and FPGA-based broadcast video equipment requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for SI5338Q-B04142-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, with leadership in RF, timing, and power management ICs for infrastructure, automotive, and mobile markets.

The Si5338 product line delivers high-precision, software-programmable clock generation for high-speed serial interfaces - designed specifically to replace multiple fixed-frequency oscillators in datacenter, telecom, and broadcast systems.

FAQ

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

The SI5338Q-B04142-GM is a quad-output, I²C-programmable clock generator that synthesizes four independent, low-jitter clock signals from a single reference. It uses Skyworks' MultiSynth™ technology to achieve 0 ppm frequency accuracy across 0.16–710 MHz per output, supporting LVPECL, LVDS, HCSL, CMOS, SSTL, and HSTL formats - making it ideal for replacing multiple crystal oscillators in PCIe, Ethernet, and FPGA timing applications.

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

Yes, the SI5338Q-B04142-GM meets PCIe Gen 4 common clock jitter specifications (0.15–0.45 ps RMS) and Gen 3 Separate Reference No Spread (SRNS) requirements (0.11–0.32 ps RMS), as validated per PCI-Express Base Specification 4.0 rev. 0.5 using the Skyworks PCIe Clock Jitter Tool. Its 0.7 ps RMS typical phase jitter ensures margin against worst-case conditions.

How many independent output voltage rails does the SI5338Q-B04142-GM support?

The SI5338Q-B04142-GM supports four independent output supply rails - VDDO0, VDDO1, VDDO2, and VDDO3 - each configurable from 1.4 V to 3.63 V. This allows simultaneous interfacing with mixed-voltage devices (e.g., 1.8 V FPGA I/O, 2.5 V SerDes, 3.3 V microcontroller) without external level shifters, directly enhancing signal integrity and reducing BOM complexity.

Can the SI5338Q-B04142-GM operate in clock buffer (PLL bypass) mode?

Yes, the SI5338Q-B04142-GM supports clock buffer mode with additive phase jitter as low as 0.165 ps RMS (12 kHz–20 MHz) for 622.08 MHz differential input. In this mode, the PLL is bypassed and outputs replicate the input clock with minimal added jitter - useful for low-latency, zero-delay distribution where synthesis is unnecessary.

What programming interface does the SI5338Q-B04142-GM use?

The SI5338Q-B04142-GM uses an I²C/SMBus-compatible serial interface (SCL/SDA pins) for configuration and runtime control. Programming is simplified using Skyworks' ClockBuilder Pro software, which generates custom configuration files and supports field updates. Factory-programmed NVM retains settings across power cycles, eliminating boot-time I²C initialization dependency for the SI5338Q-B04142-GM.