Skyworks Solutions Inc. SI5338A-B04524-GM

Overview

SI5338A-B04524-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 and SRNS compliance, and MultiSynth™ frequency synthesis supporting 0.16–710 MHz output ranges across LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL formats. It replaces up to four crystal oscillators in FPGA, processor, and Ethernet switch timing systems.

For engineers reviewing the SI5338A-B04524-GM datasheet, SI5338A-B04524-GM pinout, SI5338A-B04524-GM application, or SI5338A-B04524-GM equivalent, key selection criteria include its 24-QFN package, independent per-output voltage (1.5/1.8/2.5/3.3 V), ±20 ps phase step resolution, 1 ppm frequency increment/decrement capability, and support for external crystal (8–30 MHz), CMOS (5–200 MHz), or differential (5–710 MHz) references.

Technical Context

The SI5338A-B04524-GM implements a two-stage PLL architecture: a high-stability reference stage followed by four independent MultiSynth™ fractional-N synthesis blocks, each driving a configurable output buffer. Its core operates from a single 1.8/2.5/3.3 V supply with 45 mA typical current draw and supports zero-delay mode via external feedback.

Each of the four output drivers accepts independent configuration for signal format, output voltage, spread-spectrum modulation (0.5–5.0% spread, 33–63 kHz rate), and programmable phase offset (±45 ns). Input flexibility includes six dedicated clock inputs (IN1–IN6) accepting differential, CMOS, SSTL, or HSTL signals - enabling synchronous frequency translation and jitter cleaning in multi-protocol systems.

Key Specifications

Pinout & Package

The SI5338A-B04524-GM is housed in a 24-lead QFN package (4 mm × 4 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments are fixed per Skyworks' Si5338 family layout and validated for this variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SI5338A-B04524-GM, the Si5332A offers higher channel count and lower jitter at the cost of increased complexity and price, while the ICS8430I provides plug-and-play simplicity but sacrifices frequency flexibility, voltage scalability, and advanced features like phase tuning and SSC.

Availability

SI5338A-B04524-GM is available at Aetrix Electronics and suitable for Ethernet switch/router, PCIe Gen 1–4 server platforms, and broadcast video timing applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for SI5338A-B04524-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 delivers highly configurable, low-jitter clock generation for high-speed digital systems - designed specifically to replace multiple discrete oscillators and simplify timing architecture in FPGA, processor, and SerDes-intensive applications.

FAQ

What is the maximum output frequency supported by SI5338A-B04524-GM?

The SI5338A-B04524-GM supports up to 710 MHz on LVPECL/LVDS/CML outputs, 350 MHz on SSTL/HSTL, and 250 MHz on HCSL. For frequencies above 350 MHz, only two unique outputs may operate simultaneously (Fvco/4 and Fvco/6), as specified in Skyworks' Si5338 datasheet Rev. 1.6, Table 6 footnote 6. This limitation ensures phase noise and jitter performance remain within specification.

Does SI5338A-B04524-GM support PCIe Gen 4 Separate Reference No Spread (SRNS) mode?

Yes, SI5338A-B04524-GM is explicitly compliant with PCIe Gen 4 SRNS requirements, achieving 0.11–0.32 ps RMS jitter (10 kHz–50 MHz) when configured with PLL bandwidth of 2–4 MHz and CDR = 10 MHz. This is verified in Table 12 of the official Skyworks datasheet Rev. 1.6 and confirmed using the Skyworks PCIe Clock Jitter Tool.

Can SI5338A-B04524-GM generate four different output frequencies simultaneously?

Yes, SI5338A-B04524-GM uses four independent MultiSynth™ engines to synthesize four distinct frequencies simultaneously - each configurable from 0.16 MHz to 710 MHz depending on output format. The device achieves true zero-ppm precision on all outputs, as stated in the Skyworks Si5338 product description and verified in Table 5 (fRES = 0 ppm).

What input reference options does SI5338A-B04524-GM support?

SI5338A-B04524-GM accepts six clock inputs: differential (IN1/IN2, IN5/IN6) supporting 5–710 MHz; single-ended (IN3/IN4) supporting 5–200 MHz CMOS or 5–350 MHz SSTL/HSTL; and external crystal (8–30 MHz) on dedicated XTAL pins. All inputs are independently selectable per synthesis stage, enabling flexible redundancy and multi-source architectures.

Is SI5338A-B04524-GM pin-compatible with other Si5338 variants?

Yes, all Si5338 variants including SI5338A-B04524-GM use the identical 24-QFN package and pinout defined in Skyworks' Package Outline document (Rev. 1.6, Section 9). Mechanical and electrical pin compatibility is guaranteed across the family, though configuration registers and default startup settings may differ between variants.