Skyworks Solutions Inc. SI5338Q-B05204-GM

Overview

SI5338Q-B05204-GM 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. It replaces up to four crystal oscillators in high-speed serial interface timing applications such as PCIe root complexes and FPGA-based Ethernet switches.

For engineers reviewing the SI5338Q-B05204-GM datasheet, SI5338Q-B05204-GM pinout, SI5338Q-B05204-GM application, or SI5338Q-B05204-GM equivalent, key selection criteria include its MultiSynth™ fractional-N synthesis architecture, independent per-output voltage (1.5–3.3 V), ±20 ps phase step resolution, and support for LVPECL/LVDS/HCSL/CMOS/SSTL output formats across 0.16–710 MHz.

Technical Context

The SI5338Q-B05204-GM implements a two-stage PLL architecture: a high-stability reference stage followed by four independent MultiSynth™ fractional-N synthesis blocks, each driving one output pair (CLKxA/CLKxB). Each MultiSynth supports integer or fractional mode, enabling true zero-ppm frequency accuracy and glitchless 1 ppm frequency increment/decrement via dedicated control pins or I²C.

Input flexibility includes external crystal (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), or differential (5–710 MHz) references. Output drivers are fully decoupled-each supports independent format, voltage, spread-spectrum modulation (0.5–5.0%, 33–63 kHz), and phase offset (±45 ns) -making it suitable for multi-domain clocking in mixed-signal SoC platforms.

Key Specifications

Pinout & Package

The SI5338Q-B05204-GM is housed in a 24-lead QFN package (4 mm × 4 mm, 0.5 mm pitch) with an exposed thermal pad. Pin assignments follow Skyworks' standard Si5338 pinout layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5338A-B05204-GM, the SI5338Q-B05204-GM offers one-time programmable NVM for field customization, while versus LMK04832RHAT it delivers lower jitter (0.7 vs. 1.1 ps RMS), smaller footprint (24-QFN vs. 48-QFN), and lower core current (45 mA vs. 120 mA) at the expense of JESD204B features.

Availability

SI5338Q-B05204-GM is available at Aetrix Electronics and suitable for PCIe Gen 4 root complex timing, FPGA-based Ethernet switching, and broadcast video synchronization requiring stable component supply and long-term lifecycle assurance.

Supply support for SI5338Q-B05204-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 for high-performance, software-defined clock generation in multi-protocol systems-enabling replacement of multiple fixed-frequency oscillators with a single, field-reprogrammable timing IC.

FAQ

What is the primary function of the SI5338Q-B05204-GM?

The SI5338Q-B05204-GM is an I²C-programmable quad clock generator that synthesizes four independent, low-jitter output clocks from a single reference. Its MultiSynth™ architecture enables any-frequency generation (0.16–710 MHz) with 0 ppm precision per output, supporting PCIe Gen 1–4, Ethernet, broadcast video, and FPGA clocking applications. The "Q" suffix denotes one-time programmable (OTP) NVM for field-customizable configurations.

Does the SI5338Q-B05204-GM support PCIe Gen 4 timing requirements?

Yes, the SI5338Q-B05204-GM meets PCIe Gen 4 common clock jitter specifications: 0.15–0.45 ps RMS (12 kHz–20 MHz) when configured with PLL bandwidth 2–5 MHz and CDR = 10 MHz. It is explicitly validated for PCIe Gen 4 in Skyworks' documentation and supported by the Skyworks PCIe Clock Jitter Tool for measurement verification.

How many output formats does the SI5338Q-B05204-GM support per channel?

The SI5338Q-B05204-GM supports LVPECL, LVDS, HCSL, CML, CMOS, SSTL, and HSTL output formats - selectable independently per output pair (CLK0A/B through CLK3A/B). Each output bank has its own VDDOx supply (1.5/1.8/2.5/3.3 V), allowing mixed-format, mixed-voltage operation without external level shifters.

What is the difference between SI5338Q-B05204-GM and SI5338A-B05204-GM?

The SI5338Q-B05204-GM uses one-time programmable (OTP) NVM, enabling field configuration via ClockBuilder Pro and post-manufacture frequency/format updates. The SI5338A-B05204-GM uses factory-programmed mask ROM with fixed default settings and no field reprogramming capability. Both share identical pinout, electrical specs, and package.

Can the SI5338Q-B05204-GM operate in clock buffer (PLL bypass) mode?

Yes, the SI5338Q-B05204-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 inputs. In this mode, the PLL is bypassed and outputs directly replicate the input clock with minimal added jitter, while retaining independent output formatting and voltage control.