Skyworks Solutions Inc. SI5338L-B05947-GM

Overview

SI5338L-B05947-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 across –40 to +85 °C. It replaces up to four crystal oscillators in Ethernet switch/router, processor/FPGA clocking, and broadcast video timing systems.

For engineers reviewing the SI5338L-B05947-GM datasheet, SI5338L-B05947-GM pinout, SI5338L-B05947-GM application, or SI5338L-B05947-GM equivalent, key selection criteria include its MultiSynth™-based any-frequency synthesis (0.16–710 MHz), independent output voltage per driver (1.5/1.8/2.5/3.3 V), low-power 45 mA core supply, spread-spectrum capability (0.5–5.0% deviation), and 24-QFN 4×4 mm package.

Technical Context

The SI5338L-B05947-GM implements a two-stage PLL architecture: a high-performance synthesis stage (VCO + MultiSynth dividers) followed by a flexible output stage with independent format and voltage control per driver. Its patented MultiSynth™ technology enables fractional-N frequency synthesis with true zero-ppm accuracy on all four outputs.

It supports six input types - external crystal (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), and differential (5–710 MHz) - and delivers configurable outputs in LVPECL, LVDS, HCSL, CML, CMOS, SSTL, or HSTL formats, each with programmable phase offset (<20 ps steps), frequency increment/decrement (1 ppm steps), and spread-spectrum modulation (33–63 kHz rate).

Key Specifications

Pinout & Package

SI5338L-B05947-GM is housed in 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 Si5332A-D05947-GM, SI5338L-B05947-GM offers broader input reference support and field-programmability without integrated crystal; compared with ICS853S01AGI-01LFT, it provides full I²C configurability and multi-voltage outputs but requires firmware initialization.

Availability

SI5338L-B05947-GM is available at Aetrix Electronics and suitable for Ethernet switch/router, PCIe Gen 3/4 server platforms, and broadcast video timing systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for SI5338L-B05947-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 designed for high-performance, software-configurable clock generation in datacenter, networking, and broadcast equipment-emphasizing low jitter, multi-format flexibility, and PCIe compliance.

FAQ

What is the primary function of the SI5338L-B05947-GM?

The SI5338L-B05947-GM is an I²C-programmable quad clock generator that synthesizes four independent, low-jitter output clocks from a single reference. It serves as a drop-in replacement for multiple crystal oscillators in systems requiring precise, configurable timing-such as PCIe root complexes, Ethernet switches, and FPGA-based video processing platforms-while maintaining 0.7 ps RMS phase jitter and PCIe Gen 4 compliance.

Does the SI5338L-B05947-GM support PCIe Gen 4 timing requirements?

Yes, the SI5338L-B05947-GM meets PCIe Gen 4 Common Clock jitter specifications with 0.15–0.45 ps RMS (12 kHz–20 MHz) when configured per Skyworks' recommended settings-including PLL bandwidth of 2–4 MHz and CDR = 10 MHz. This compliance is verified using the Skyworks PCIe Clock Jitter Tool and aligns with PCI-Express Base Specification 4.0 rev. 0.5.

Can the SI5338L-B05947-GM generate different output voltages simultaneously?

Yes, the SI5338L-B05947-GM supports independent output buffer supplies (VDDO0–VDDO3), enabling simultaneous LVDS (2.5 V), HCSL (1.8 V), CMOS (3.3 V), and SSTL (1.5 V) outputs on its four driver banks. Each VDDO pin accepts 1.4–3.63 V, allowing direct interfacing with mixed-voltage ASICs, FPGAs, and PHYs without level-shifting components.

How is the SI5338L-B05947-GM programmed and configured?

The SI5338L-B05947-GM is programmed via its I²C/SMBus-compatible interface using Skyworks' ClockBuilder Pro software, which generates custom configuration files (.cbpro) and register maps. Configuration can be stored in on-chip OTP NVM for autonomous startup, or loaded dynamically at boot. Pin-controlled frequency/phase adjustments (PINC/FDEC) also enable real-time tuning without host intervention.

What package type and thermal characteristics does the SI5338L-B05947-GM have?

The SI5338L-B05947-GM uses a 24-lead 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 at full load across –40 to +85 °C ambient. The package is RoHS-compliant and rated MSL-3 per JEDEC J-STD-020.