Skyworks Solutions Inc. SI5338N-B05315-GM

Overview

SI5338N-B05315-GM 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 PCIe Gen 4–compliant timing systems for FPGA and Ethernet switch applications.

For engineers reviewing the SI5338N-B05315-GM datasheet, SI5338N-B05315-GM pinout, SI5338N-B05315-GM application, or SI5338N-B05315-GM equivalent, this page provides verified technical context, validated pin functions, confirmed PCIe Gen 4 SRNS compliance, real-world jitter performance data (0.11–0.45 ps RMS), and alternative selection guidance grounded in Skyworks' official Si5338 family documentation.

Technical Context

The SI5338N-B05315-GM implements a two-stage PLL architecture: a high-stability reference stage (with crystal or external clock input) followed by four independent MultiSynth™ fractional-N synthesizers per output. Each synthesizer supports integer or fractional mode operation, enabling true zero-ppm frequency accuracy across all four outputs.

It features fully independent output configuration-voltage (1.5/1.8/2.5/3.3 V), format (LVPECL to CMOS), phase offset (±45 ns, <20 ps step), and spread-spectrum control (0.5–5.0% down-spread, 33–63 kHz)-all programmable via I²C/SMBus interface with ClockBuilder Pro software support.

Key Specifications

Pinout & Package

SI5338N-B05315-GM uses a 24-lead QFN package (4 mm × 4 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined per Skyworks Rev. 1.6 datasheet Section 7 and Figure 1 (Top View).

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5338A-B05315-GM, the SI5338N-B05315-GM trades minor initial accuracy tolerance for cost-optimized industrial qualification; versus Si5332A-D05315-GM, it retains proven Gen 4 compatibility and simpler power design at the expense of future-proofing and ultra-low jitter.

Availability

SI5338N-B05315-GM is available at Aetrix Electronics and suitable for PCIe Gen 4 switch timing, Ethernet switch clocking, and FPGA/ASIC clock distribution requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.

Supply support for SI5338N-B05315-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 was engineered to replace multiple fixed-frequency oscillators with a single programmable clock generator for high-speed digital systems-specifically targeting PCIe, Ethernet, and broadcast video timing where jitter, flexibility, and space savings are critical.

FAQ

What is the maximum output frequency supported by SI5338N-B05315-GM?

The SI5338N-B05315-GM supports up to 710 MHz on LVPECL/LVDS/CML outputs, 350 MHz on SSTL/HSTL, 250 MHz on HCSL, and 200 MHz on CMOS. However, only two unique frequencies above 350 MHz can be generated simultaneously (Fvco/4 and Fvco/6), as specified in Skyworks Rev. 1.6 datasheet Table 6 Note 6. All frequencies are synthesized with MultiSynth™ technology and maintain 0.7 ps RMS jitter.

Does SI5338N-B05315-GM support PCIe Gen 4 Common Clock compliance?

Yes, SI5338N-B05315-GM meets PCIe Gen 4 Common Clock jitter specifications: 0.15–0.45 ps RMS (10 kHz–50 MHz band), verified per PCI-SIG Base Specification 4.0 rev. 0.5 and measured using the Skyworks PCIe Clock Jitter Tool. It also satisfies Gen 3 SRNS requirements at ≤0.32 ps RMS when configured with PLL bandwidth of 2–4 MHz and CDR = 10 MHz.

How is the SI5338N-B05315-GM programmed, and what tools are required?

The SI5338N-B05315-GM is programmed via its I²C/SMBus interface using Skyworks' ClockBuilder Pro software (free download). This GUI tool generates custom configuration files, validates timing constraints, and writes settings to the device's OTP memory. No external hardware programmer is needed-configuration occurs in-system during power-up or runtime via standard I²C commands.

What are the power supply requirements for SI5338N-B05315-GM?

SI5338N-B05315-GM requires a core supply (VDD) of 1.8 V (±10%), 2.5 V (±10%), or 3.3 V (±10%), drawing 45 mA typical at 100 MHz on all outputs. Each output bank has an independent VDDO supply (1.4–3.63 V) allowing mixed-voltage clock distribution-for example, LVDS at 2.5 V and HCSL at 1.8 V simultaneously-without level-shifting circuitry.

Can SI5338N-B05315-GM operate in clock buffer (PLL bypass) mode?

Yes, SI5338N-B05315-GM supports clock buffer mode, where input clocks pass directly to outputs with minimal additive jitter (0.165 ps RMS typical, 12 kHz–20 MHz). In this mode, the PLL is disabled, propagation delay is 2.5–4 ns, and loss-of-signal detection remains functional for inputs ≥5 MHz. Buffer mode is enabled via register configuration and preserves all output format and voltage settings.