Skyworks Solutions Inc. SI5338Q-B05073-GM

Overview

SI5338Q-B05073-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 SI5338Q-B05073-GM datasheet, SI5338Q-B05073-GM pinout, SI5338Q-B05073-GM application, or SI5338Q-B05073-GM equivalent, key selection factors include its 4× differential output capability, 0 ppm synthesis accuracy, independent per-output voltage control (1.5–3.3 V), spread-spectrum support (0.5–5.0% at 33–63 kHz), and compliance with PCIe Gen 3 SRNS and Common Clock specifications.

Technical Context

The SI5338Q-B05073-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 enable any-frequency generation on each of four outputs. It supports both free-running and zero-delay modes via external feedback.

Each output driver is independently configurable for format, voltage (1.5/1.8/2.5/3.3 V), phase offset (±45 ns, <20 ps step), and frequency increment/decrement (1 ppm steps, glitchless). Loss-of-lock and loss-of-signal alarms, plus I²C/SMBus interface with ClockBuilder Pro software support, enable robust system-level timing control.

Key Specifications

Pinout & Package

SI5338Q-B05073-GM is housed in a 24-lead, 4 × 4 mm QFN package with wettable flanks and an exposed thermal pad (GND-connected). Pin 1 is top-left corner (IN1), pin 24 is bottom-right (GND), and pin 13 is CLK3A - all pins are surface-mount compatible with JEDEC-standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5332A-D05089-GM and ICS8430I-01LG, the SI5338Q-B05073-GM provides unmatched configurability-supporting any output frequency, mixed signal formats, independent voltage rails, and real-time tuning-making it optimal for evolving multi-protocol platforms where timing requirements span PCIe, Ethernet, and broadcast video domains.

Availability

SI5338Q-B05073-GM is available at Aetrix Electronics and suitable for telecom line cards, PCIe Gen 4 switch designs, and broadcast video equipment requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for SI5338Q-B05073-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 family was designed specifically for high-density, multi-protocol timing consolidation in networking, computing, and broadcast systems-replacing multiple oscillators with a single, software-configurable, low-jitter clock generator.

FAQ

What is the primary function of the SI5338Q-B05073-GM in a system?

The SI5338Q-B05073-GM serves as a quad-output, I²C-programmable clock generator that synthesizes four independent, low-jitter clock signals from a single reference input. Its core function is timing consolidation-replacing up to four discrete oscillators while enabling precise frequency, phase, and format control per output. This makes the SI5338Q-B05073-GM ideal for PCIe, Ethernet, and FPGA-based systems requiring flexible, high-accuracy clock distribution.

Does the SI5338Q-B05073-GM support PCIe Gen 4 timing requirements?

Yes, the SI5338Q-B05073-GM meets PCIe Gen 4 Common Clock jitter specifications with ≤0.45 ps RMS (12 kHz–20 MHz) when configured per Skyworks' recommended settings-including 2–5 MHz PLL bandwidth and HCSL 100 MHz outputs. It also satisfies PCIe Gen 3 SRNS (≤0.32 ps RMS) and Gen 1/2/3 Common Clock requirements, making the SI5338Q-B05073-GM suitable for full-generation backward-compatible designs.

Can the SI5338Q-B05073-GM generate different output formats simultaneously?

Yes-the SI5338Q-B05073-GM supports simultaneous LVPECL, LVDS, HCSL, CMOS, SSTL, and HSTL outputs across its four differential pairs. Each output driver is independently configurable for format and supply voltage (1.5/1.8/2.5/3.3 V), allowing mixed-signal interfacing-for example, LVDS to an FPGA and HCSL to a PCIe switch-without external level translators. This capability is intrinsic to the SI5338Q-B05073-GM architecture.

How is the SI5338Q-B05073-GM programmed and configured?

The SI5338Q-B05073-GM is programmed via its I²C/SMBus-compatible interface using Skyworks' ClockBuilder Pro software, which auto-generates register maps and configuration files based on user-defined frequency, format, and jitter targets. Configuration can be stored in on-chip OTP memory for power-on initialization. The SI5338Q-B05073-GM also supports pin-controlled frequency increment/decrement and phase adjustment for runtime tuning without host intervention.

What package type and thermal characteristics does the SI5338Q-B05073-GM have?

The SI5338Q-B05073-GM uses a 24-pin QFN package measuring 4 × 4 mm with 0.5 mm pitch and an exposed thermal pad. Its thermal resistance is θJA = 37 °C/W (still air) and θJC = 10 °C/W, enabling reliable operation up to +85 °C ambient. The package supports standard reflow profiles and requires proper PCB thermal vias under the exposed pad for optimal heat dissipation-critical for sustained 45 mA core current operation in the SI5338Q-B05073-GM.