Skyworks Solutions Inc. SI5338C-B05390-GM

Overview

SI5338C-B05390-GM from Skyworks Solutions is an I²C-programmable quad clock generator IC 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 in a 4 × 4 mm 24-QFN package. It replaces up to four crystal oscillators in high-speed serial interface timing applications.

For engineers reviewing the SI5338C-B05390-GM datasheet, SI5338C-B05390-GM pinout, SI5338C-B05390-GM application, or SI5338C-B05390-GM equivalent, key selection considerations include its MultiSynth™-based any-frequency synthesis (0.16–710 MHz per output), independent output voltage control (1.5/1.8/2.5/3.3 V), spread-spectrum capability (0.5–5.0% down-spread), and I²C/SMBus programmability with ClockBuilder Pro support.

Technical Context

The SI5338C-B05390-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 synthesis blocks, each feeding a configurable output driver. This enables true zero-ppm frequency accuracy on all outputs without requiring integer-related frequencies.

Each output supports LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL formats with independent supply voltage (VDDOx), programmable phase offset (±45 ns, <20 ps step), and glitchless frequency increment/decrement (1 ppm steps). Input flexibility includes differential (5–710 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), or 8–30 MHz crystal reference.

Key Specifications

Pinout & Package

SI5338C-B05390-GM uses a 24-lead QFN package (4 × 4 mm body, 0.5 mm pitch) with exposed thermal pad. Pin 1 is top-left corner (IN1), pin numbering proceeds counterclockwise. The package supports reflow soldering per JEDEC J-STD-020 and provides low thermal resistance (θ_JA = 37 °C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5332A-D05389-GM, SI5338C-B05390-GM offers broader input flexibility and simpler configuration for general-purpose any-frequency synthesis, while ICS853S01AGI-01LFT provides lower cost and power for static fanout but lacks programmability and jitter performance.

Availability

SI5338C-B05390-GM is available at Aetrix Electronics and suitable for PCIe switch timing, Ethernet switching, and FPGA clocking applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for SI5338C-B05390-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 family is designed as a programmable, low-jitter quad clock generator targeting high-speed serial interface timing in networking, computing, and broadcast equipment - emphasizing flexibility, PCIe compliance, and ease of configuration via ClockBuilder Pro.

FAQ

What is the primary function of the SI5338C-B05390-GM in a system design?

The SI5338C-B05390-GM serves as an I²C-programmable quad clock generator that synthesizes four independent, low-jitter output clocks from a single reference (crystal or external clock). It replaces multiple discrete oscillators in applications like PCIe switches, Ethernet routers, and FPGA platforms, enabling flexible, software-defined timing with 0 ppm frequency accuracy and sub-20 ps phase resolution.

Does the SI5338C-B05390-GM support PCIe Gen 4 timing requirements?

Yes, the SI5338C-B05390-GM meets PCIe Gen 4 Common Clock jitter specifications with 0.15–0.45 ps RMS (10 kHz–50 MHz) when configured per Skyworks' recommended settings, including PLL bandwidth of 2–4 MHz and CDR = 10 MHz. Its 0.7 ps RMS typical phase jitter and MultiSynth™ architecture ensure robust compliance across temperature and voltage variations.

Can the SI5338C-B05390-GM generate both differential and single-ended outputs simultaneously?

Yes, the SI5338C-B05390-GM supports up to four differential outputs (LVPECL/LVDS/HCSL/CML) and eight single-ended outputs (CMOS/SSTL/HSTL) - or any combination - with independent voltage control per output group (VDDO0–VDDO3). Each output driver is fully configurable via I²C, allowing mixed-signal clock distribution without external level-shifting components.

How is the SI5338C-B05390-GM programmed and configured?

The SI5338C-B05390-GM is programmed via its I²C/SMBus-compatible interface using Skyworks' ClockBuilder Pro software, which provides GUI-based configuration, real-time jitter estimation, and one-click register file generation. Configuration can be stored in on-chip OTP memory for autonomous startup, or loaded dynamically during system operation for adaptive clock management.

What thermal performance can be expected from the SI5338C-B05390-GM in a standard PCB layout?

In a standard 4-layer PCB with adequate copper pour and thermal vias under the exposed pad, the SI5338C-B05390-GM exhibits a junction-to-ambient thermal resistance (θ_JA) of 37 °C/W. At full load (45 mA core current), this results in ~1.7 °C rise above ambient - well within its –40 to +85 °C operating range and compatible with industrial and telecom thermal profiles.