Skyworks Solutions Inc. SI5338A-B05709-GMR

Overview

SI5338A-B05709-GMR from Skyworks Solutions is a quad-output, I²C-programmable clock generator with MultiSynth™ frequency synthesis. It delivers four independent, any-frequency outputs (0.16–710 MHz), supports LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL formats, achieves 0.7 ps RMS phase jitter, and operates from 1.8/2.5/3.3 V core supply in a 4×4 mm 24-QFN package - used in PCIe Gen 4 timing, FPGA clocking, and broadcast video systems.

For engineers reviewing the SI5338A-B05709-GMR datasheet, SI5338A-B05709-GMR pinout, SI5338A-B05709-GMR application, or SI5338A-B05709-GMR equivalent, key selection criteria include PCIe Gen 4 SRNS compliance, independent per-output voltage control (1.5–3.3 V), 1 ppm frequency increment/decrement, <20 ps phase step resolution, and spread-spectrum capability (0.5–5.0% at 33–63 kHz).

Technical Context

The SI5338A-B05709-GMR implements a two-stage PLL architecture: a high-stability reference stage (with crystal or external clock input) feeding a fractional-N MultiSynth™ synthesis stage per output. Each of the four outputs features independent R, M, and P dividers enabling integer or fractional frequency generation with true zero-ppm accuracy.

It supports flexible input references - 8–30 MHz crystal, 5–200 MHz CMOS, 5–350 MHz SSTL/HSTL, or 5–710 MHz differential - and provides loss-of-lock and loss-of-signal alarms. Output drivers are independently configurable for format, voltage, enable, and spread-spectrum modulation, with glitchless frequency/phase adjustments via pin or I²C control.

Key Specifications

Pinout & Package

SI5338A-B05709-GMR is housed in a 24-lead QFN package (4 × 4 mm, 0.5 mm pitch) with an exposed thermal pad. Pin assignments follow Skyworks' standard Si5338 layout: inputs IN1–IN6 (differential and single-ended), outputs CLK0A/B–CLK3A/B, power pins VDD, VDDO0–VDDO3, control pins SCL/SDA/INTR/OEB, and reserved ground (RSVD_GND).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SI5338A-B05709-GMR, Si5338A-B05710-GMR offers identical performance but different factory defaults, while LMK04832RHAR adds JESD204B features at the cost of higher power, larger footprint, and reduced frequency flexibility - making it unsuitable for PCIe or broadcast video where compact size and wide synthesis range are critical.

Availability

SI5338A-B05709-GMR is available at Aetrix Electronics and suitable for PCIe Gen 4 server platforms, FPGA-based broadcast video equipment, and telecom line cards requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for SI5338A-B05709-GMR 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 as a highly configurable, low-jitter clock generator platform for replacing multiple discrete oscillators in high-speed digital systems - targeting PCIe, Ethernet, broadcast, and telecom applications demanding precision, flexibility, and small footprint.

FAQ

What is the primary function of the SI5338A-B05709-GMR?

The SI5338A-B05709-GMR is a quad-output, I²C-programmable clock generator using Skyworks' MultiSynth™ technology to synthesize any frequency from 0.16 MHz to 710 MHz on each output. It replaces up to four crystal oscillators, supports PCIe Gen 4 SRNS compliance, and enables independent configuration of format, voltage, and jitter performance per output - all within a 4×4 mm QFN package.

Does the SI5338A-B05709-GMR support PCIe Gen 4 timing requirements?

Yes, the SI5338A-B05709-GMR meets PCIe Gen 4 Common Clock jitter specifications (≤0.45 ps RMS, 10 kHz–50 MHz) and SRNS (Separate Reference No Spread) requirements (≤0.32 ps RMS) when configured with a 2–5 MHz PLL bandwidth and appropriate input reference. Its 0.7 ps RMS typical phase jitter and validated PCIe jitter test results confirm compliance per PCI-SIG Base Spec 4.0.

How many independent output voltage supplies does the SI5338A-B05709-GMR support?

The SI5338A-B05709-GMR supports four independent output buffer supply rails - VDDO0, VDDO1, VDDO2, and VDDO3 - each configurable for 1.5 V, 1.8 V, 2.5 V, or 3.3 V. This allows simultaneous interfacing with mixed-voltage devices (e.g., 1.8 V FPGA banks and 3.3 V PHYs) without external level shifters, directly driving LVPECL, LVDS, HCSL, CMOS, SSTL, or HSTL loads.

Can the SI5338A-B05709-GMR generate spread-spectrum clocking (SSC)?

Yes, the SI5338A-B05709-GMR supports per-output spread-spectrum clocking with programmable depth (0.5–5.0%), modulation rate (33–63 kHz), and direction (down-spread only). SSC can be enabled independently on any output to reduce electromagnetic interference (EMI) in noise-sensitive applications such as display interfaces or high-density server backplanes - without affecting other outputs.

What development tools are available for configuring the SI5338A-B05709-GMR?

Skyworks' ClockBuilder Pro software is the official GUI tool for configuring the SI5338A-B05709-GMR - enabling full register setup, NVM programming, jitter simulation, and export of configuration files. The SI5338A-B05709-GMR also supports the Skyworks PCIe Clock Jitter Tool for rapid validation against PCIe jitter masks, and its I²C interface allows integration into automated test and field-upgrade workflows.