Skyworks Solutions Inc. SI5338C-B05777-GMR

Overview

SI5338C-B05777-GMR 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 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-B05777-GMR datasheet, SI5338C-B05777-GMR pinout, SI5338C-B05777-GMR application, or SI5338C-B05777-GMR equivalent, key selection criteria 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-B05777-GMR implements a two-stage PLL architecture: a high-stability reference stage (with crystal or external clock input) feeding a fractional-N MultiSynth™ synthesis stage per output. Each of the four outputs features independent R, M, and P dividers enabling integer or fractional frequency synthesis with 1 ppb resolution.

It supports flexible input references - including 8–30 MHz crystals, 5–200 MHz CMOS, 5–350 MHz SSTL/HSTL, and 5–710 MHz differential inputs - and delivers configurable output formats (LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL) with per-output supply voltage (VDDOx) and programmable phase/frequency increment/decrement (±45 ns / ±20 ps steps).

Key Specifications

Pinout & Package

SI5338C-B05777-GMR is housed in a 24-lead, 4 × 4 mm QFN package with exposed thermal pad. Pin assignments are fixed per the Si5338 family: IN1/IN2 (differential ref 1), IN3/IN4 (single-ended ref), IN5/IN6 (differential ref 2), CLK0A/CLK0B through CLK3A/CLK3B (four differential output pairs), VDDO0–VDDO3 (independent output supply pins), VDD (core supply), SCL/SDA (I²C interface), INTR (interrupt output), and RSVD_GND (reserved ground).

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5338A-B-GM, SI5338C-B05777-GMR provides field-programmable flexibility and optimized PCIe Gen 4 timing; compared with LMK04832ISQE/NOPB, it delivers equivalent jitter performance at half the power and footprint for serial interface clocking.

Availability

SI5338C-B05777-GMR is available at Aetrix Electronics and suitable for PCIe Gen 4 switch timing, Ethernet routing infrastructure, and broadcast video equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for SI5338C-B05777-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 communications, automotive, and industrial markets.

The Si5338 product line was designed specifically for high-density, multi-protocol timing consolidation in networking, computing, and broadcast systems - replacing discrete oscillators while maintaining sub-picosecond jitter and PCIe compliance.

FAQ

What is the primary function of the SI5338C-B05777-GMR?

The SI5338C-B05777-GMR is an I²C-programmable quad clock generator that synthesizes four independent, low-jitter output clocks from a single reference input. Its MultiSynth™ technology enables any-frequency generation (0.16–710 MHz) with 0 ppm precision, making it ideal for PCIe Gen 4, Ethernet, and broadcast video timing. SI5338C-B05777-GMR replaces up to four discrete oscillators while maintaining strict jitter compliance.

Does the SI5338C-B05777-GMR support PCIe Gen 4 timing requirements?

Yes, the SI5338C-B05777-GMR meets PCIe Gen 4 common clock jitter specifications (≤0.45 ps RMS, 10 kHz–50 MHz) and is explicitly validated for Gen 3 SRNS compliance (≤0.32 ps RMS). It achieves this using its patented MultiSynth™ architecture and optimized PLL loop bandwidth (2–5 MHz), with measurement data confirmed via Intel Clock Jitter Tool and Skyworks' PCIe Clock Jitter Tool.

How is the SI5338C-B05777-GMR programmed and configured?

The SI5338C-B05777-GMR is programmed via its I²C/SMBus-compatible serial interface using Skyworks' ClockBuilder Pro software. This GUI-based tool enables full register configuration - including output frequencies, formats, voltages, spread spectrum, and phase offsets - and generates custom configuration files. SI5338C-B05777-GMR supports both EEPROM-based startup and runtime reconfiguration without reset.

What output formats and voltage levels does the SI5338C-B05777-GMR support?

The SI5338C-B05777-GMR supports LVPECL, LVDS, HCSL, CMOS, SSTL, and HSTL output formats across its four differential output pairs. Each output pair has an independent supply pin (VDDO0–VDDO3), allowing simultaneous operation at 1.5 V, 1.8 V, 2.5 V, or 3.3 V - critical for interfacing with mixed-voltage SoCs, FPGAs, and PHYs in modern systems.

What is the thermal performance and package type of the SI5338C-B05777-GMR?

The SI5338C-B05777-GMR uses a 24-pin QFN package (4 × 4 mm, 0.5 mm pitch) with an exposed thermal pad. Its thermal resistance is θJA = 37 °C/W (still air), and junction-to-case resistance is θJC = 10 °C/W. At typical operating conditions (100 MHz on all outputs), core supply current is 45 mA, resulting in low self-heating - enabling reliable operation from –40 to +85 °C without forced airflow.