Skyworks Solutions Inc. SI5338N-B05263-GMR

Overview

SI5338N-B05263-GMR 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 across –40 to +85 °C. It replaces up to four crystal oscillators in high-speed serial interface timing applications including PCIe root complexes and FPGA clock trees.

For engineers reviewing the SI5338N-B05263-GMR datasheet, SI5338N-B05263-GMR pinout, SI5338N-B05263-GMR application, or SI5338N-B05263-GMR equivalent, this page delivers verified specifications, validated pin functions, confirmed PCIe Gen 4 jitter compliance, and real-world use cases for Ethernet switch timing, broadcast video synchronization, and processor/FPGA clock domain management.

Technical Context

The SI5338N-B05263-GMR integrates a fractional-N PLL with patented MultiSynth™ synthesis stages per output, enabling independent any-frequency generation from a single reference input. Its architecture supports both free-running synthesis and synchronous frequency translation modes, with external feedback enabling zero-delay operation.

Each of the four output drivers supports LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL formats at voltages from 1.5 V to 3.3 V, with independent phase adjustment (<20 ps steps), frequency increment/decrement (1 ppm steps), and programmable spread-spectrum modulation (0.5–5.0% spread, 33–63 kHz rate).

Key Specifications

Pinout & Package

SI5338N-B05263-GMR uses a 24-lead, 4 × 4 mm QFN package with exposed thermal pad. Pin assignments are fixed per the Si5338 family and validated for this variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SI5338N-B05263-GMR, Si5332A-D05289-GM offers superior jitter and scalability at higher cost and board area, while ICS8430I-01T provides lower unit cost and simpler validation for immutable clocking schemes but sacrifices programmability and multi-voltage support.

Availability

SI5338N-B05263-GMR is available at Aetrix Electronics and suitable for PCIe Gen 4 timing, broadcast video synchronization, and FPGA-based embedded processing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SI5338N-B05263-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 semiconductor company specializing in analog and mixed-signal connectivity solutions, with leadership in RF, timing, and precision analog products for infrastructure, automotive, and mobile markets.

The Si5338 product line was designed to replace multiple fixed-frequency oscillators with a single programmable clock generator for high-speed serial interfaces, targeting PCIe, Ethernet, Fibre Channel, and broadcast video systems demanding low jitter and flexible configuration.

FAQ

What is the guaranteed phase jitter performance of SI5338N-B05263-GMR under PCIe Gen 4 Common Clock conditions?

The SI5338N-B05263-GMR delivers 0.15–0.45 ps RMS phase jitter when configured per PCIe Gen 4 Common Clock requirements (100 MHz HCSL outputs, PLL bandwidth 2–5 MHz, CDR = 10 MHz). This is measured using the Skyworks PCIe Clock Jitter Tool and complies with PCI-SIG Base Specification 4.0 rev. 0.5. The SI5338N-B05263-GMR achieves this without external jitter cleaning circuitry.

Does SI5338N-B05263-GMR support external crystal reference, and what frequency range is validated?

Yes, SI5338N-B05263-GMR supports external crystals from 8 to 30 MHz, with full characterization across four bands: 8–11 MHz, 11–19 MHz, 19–26 MHz, and 26–30 MHz. Each band specifies supported and recommended load capacitance (11–13 pF supported, 17–19 pF recommended), ESR limits (≤300 Ω), and max drive level (100 µW).

Can SI5338N-B05263-GMR generate different output formats simultaneously, such as LVDS and CMOS on separate channels?

Yes, SI5338N-B05263-GMR supports mixed output formats: any combination of LVPECL, LVDS, HCSL, CMOS, SSTL, or HSTL across its four output drivers. Each output has independent format selection and voltage rail (VDDOx = 1.5–3.3 V), enabling direct interface to heterogeneous logic families without external translators.

How is frequency updated on SI5338N-B05263-GMR during live operation without causing glitches?

SI5338N-B05263-GMR implements glitchless frequency adjustment via dedicated PINC/FDEC control pins or I²C register writes. Frequency changes occur in 1 ppm increments with update times of 667 ns (for outputs >18 MHz) or 10–12 periods (for outputs <18 MHz), ensuring seamless transitions without cycle slips or phase discontinuities in the SI5338N-B05263-GMR output waveform.

What is the maximum number of unique frequencies above 350 MHz that SI5338N-B05263-GMR can generate simultaneously?

SI5338N-B05263-GMR can generate two unique frequencies above 350 MHz simultaneously-specifically Fvco/4 and Fvco/6-due to internal VCO architecture constraints. All other outputs above 350 MHz must be integer-related to one of these two base frequencies. This limitation is documented in Section 3.3 "Synthesis Stages" of the SI5338N-B05263-GMR datasheet.