Skyworks Solutions Inc. SI5338N-B05753-GMR

Overview

SI5338N-B05753-GMR from Skyworks Solutions is an I²C-programmable quad clock generator with four independently configurable differential outputs, 0.7 ps RMS typical phase jitter, PCIe Gen 1–4 Common Clock and Gen 3 SRNS compliance, and support for LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL output formats across 0.16–710 MHz. It replaces up to four crystal oscillators in high-speed serial interface timing applications.

For engineers reviewing the SI5338N-B05753-GMR datasheet, SI5338N-B05753-GMR pinout, SI5338N-B05753-GMR application, or SI5338N-B05753-GMR equivalent, key selection criteria include PCIe Gen 4 jitter compliance (0.15–0.45 ps RMS), independent per-output voltage control (1.5/1.8/2.5/3.3 V), MultiSynth™ fractional synthesis resolution (1 ppb), spread-spectrum capability (0.5–5.0% down-spread), and 24-pin 4×4 mm QFN package compatibility with industrial temperature range (–40 to +85 °C).

Technical Context

The SI5338N-B05753-GMR implements a two-stage PLL architecture: a high-stability reference stage (input frequency 5–710 MHz) feeding a digitally controlled VCO-based MultiSynth™ synthesis stage. Each of its four output drivers uses independent M/N/P dividers to generate any-frequency clocks with true zero-ppm accuracy and <20 ps programmable phase step resolution.

It supports flexible input references-including 8–30 MHz crystals, 5–200 MHz CMOS, and 5–710 MHz differential inputs-and enables glitchless frequency adjustment in 1 ppm steps via dedicated PINC/FINC pins. Loss-of-lock and loss-of-signal alarms provide real-time status monitoring for system-level fault detection.

Key Specifications

Pinout & Package

SI5338N-B05753-GMR is housed in a 24-lead QFN package (4 × 4 mm, 0.5 mm pitch) 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-D05753-GM and ICS853S01AGI-01LFT, SI5338N-B05753-GMR uniquely balances field-programmability, PCIe Gen 4 readiness, and industrial temperature support in a compact 24-QFN-making it optimal for new designs requiring flexible, certified timing in networking and compute infrastructure.

Availability

SI5338N-B05753-GMR is available at Aetrix Electronics and suitable for PCIe Gen 4 switch timing, Ethernet switching/routing, broadcast video timing, and FPGA/processor clocking requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for SI5338N-B05753-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 leader in analog and mixed-signal semiconductors, specializing in RF, timing, and connectivity solutions for infrastructure, automotive, and mobile markets.

The Si5338 product line was designed for high-performance, software-configurable clock generation in data-intensive systems-enabling consolidation of multiple oscillators into a single IC with guaranteed jitter performance and PCIe compliance.

FAQ

What is the primary function of the SI5338N-B05753-GMR?

The SI5338N-B05753-GMR is an I²C-programmable quad clock generator that synthesizes four independent, low-jitter output frequencies from a single reference input. Its core function is to replace multiple discrete oscillators in high-speed digital systems-such as PCIe Gen 4 switches and Ethernet routers-while providing precise frequency, phase, and spread-spectrum control. The SI5338N-B05753-GMR achieves this using Skyworks' patented MultiSynth™ technology and supports industrial temperature operation (–40 to +85 °C).

Does the SI5338N-B05753-GMR support PCIe Gen 4 timing requirements?

Yes, the SI5338N-B05753-GMR is explicitly compliant with PCIe Gen 4 Common Clock architecture, delivering ≤0.45 ps RMS jitter (12 kHz–20 MHz) when configured per specification-verified using the Skyworks PCIe Clock Jitter Tool and Intel Clock Jitter Tool v1.6.4. It also meets PCIe Gen 3 SRNS requirements (≤0.32 ps RMS) and supports the required 2–5 MHz PLL loop bandwidth. This compliance is confirmed in the official Skyworks Rev. 1.6 datasheet, Table 12.

What output formats and voltage levels does the SI5338N-B05753-GMR support?

The SI5338N-B05753-GMR supports LVPECL, LVDS, HCSL, CML, CMOS, SSTL, and HSTL output formats across frequencies from 0.16 MHz to 710 MHz. Each of its four output drivers has an independent VDDO supply rail configurable for 1.5 V, 1.8 V, 2.5 V, or 3.3 V-enabling direct interface to mixed-voltage FPGAs, ASICs, and processors without external level shifters. Output voltage specifications (e.g., LVDS common-mode = 1.2 V @ 2.5/3.3 V) are fully detailed in Table 6 of the datasheet.

How is the SI5338N-B05753-GMR programmed and configured?

The SI5338N-B05753-GMR is programmed via an I²C/SMBus-compatible serial interface (SCL/SDA pins) operating at 100 kHz or 400 kHz. Configuration is simplified using Skyworks' ClockBuilder Pro software, which generates register maps and configuration files based on user-defined frequency, format, and jitter requirements. Hardware controls (PINC/FINC/OEB) allow real-time frequency tuning and output enable/disable without I²C traffic. All settings can be stored in on-chip OTP memory for autonomous startup.

What package type and thermal characteristics does the SI5338N-B05753-GMR have?

The SI5338N-B05753-GMR uses a 24-pin 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 the –40 to +85 °C industrial temperature range. The package is RoHS-compliant and compatible with standard reflow profiles, including peak soldering temperature up to 260 °C per JEDEC J-STD-020.