Skyworks Solutions Inc. SI5338C-B04853-GM

Overview

SI5338C-B04853-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 in a 4 × 4 mm 24-QFN package. It replaces up to four crystal oscillators in Ethernet switch/router, processor/FPGA clocking, and broadcast video timing systems.

For engineers reviewing the SI5338C-B04853-GM datasheet, SI5338C-B04853-GM pinout, SI5338C-B04853-GM application, or SI5338C-B04853-GM equivalent, key selection criteria include its MultiSynth™-based any-frequency synthesis (0.16–710 MHz per output), independent output voltage support (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 software integration.

Technical Context

The SI5338C-B04853-GM implements a two-stage PLL architecture: a high-stability reference stage (with external crystal or CMOS/SSTL/differential inputs) feeding a fractional-N MultiSynth™ synthesis stage per output. Each of the four outputs features independent frequency, format (LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL), voltage, phase offset (±45 ns), and spread-spectrum control.

It supports flexible input references including 8–30 MHz crystals, 5–200 MHz CMOS, 5–350 MHz SSTL/HSTL, and 5–710 MHz differential signals. Output drivers deliver low additive jitter in buffer mode (0.165 ps RMS, 12 kHz–20 MHz) and maintain <0.7 ps RMS jitter in full synthesis mode when configured per PCIe Gen 4 and GbE requirements.

Key Specifications

Pinout & Package

SI5338C-B04853-GM is housed in a 24-lead QFN package (4 × 4 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments are fixed per Skyworks Si5338 family layout: IN1/IN2 (differential ref 1), IN3/IN4 (single-ended ref 1/2), IN5/IN6 (differential ref 2/3), 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 clock generator applications.

Compared with Si5332A-D05889-GM, SI5338C-B04853-GM offers smaller footprint and lower cost for 4-output needs; versus ICS8430I-01T, it delivers field-programmability, multi-voltage support, and PCIe Gen 4 compliance - critical for adaptive compute and high-speed serial link designs.

Availability

SI5338C-B04853-GM is available at Aetrix Electronics and suitable for Ethernet switch/router timing, PCIe Gen 1–4 clocking, and broadcast video/audio timing requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for SI5338C-B04853-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, programmable clock generation in datacenter, telecom, and broadcast systems - emphasizing low jitter, multi-format flexibility, and software-configurable synthesis without external loop filters.

FAQ

What is the primary function of the SI5338C-B04853-GM in a system?

The SI5338C-B04853-GM serves as a programmable quad clock generator that synthesizes up to four independent, low-jitter output frequencies from a single reference input. Its core function is to replace multiple discrete oscillators while enabling precise timing control for high-speed serial interfaces like PCIe, Ethernet, and broadcast video - all within the SI5338C-B04853-GM's 4 × 4 mm QFN package.

Does the SI5338C-B04853-GM support PCIe Gen 4 timing requirements?

Yes, the SI5338C-B04853-GM is explicitly validated for PCIe Gen 4 Common Clock compliance, delivering ≤0.45 ps RMS jitter (12 kHz–20 MHz) at 100 MHz HCSL output under specified conditions. It also supports PCIe Gen 3 Separate Reference No Spread (SRNS) mode with ≤0.32 ps RMS jitter, making the SI5338C-B04853-GM suitable for server, GPU, and NVMe SSD clocking applications.

Can the SI5338C-B04853-GM generate different output voltages simultaneously?

Yes - the SI5338C-B04853-GM provides four independent VDDOx supply pins (VDDO0–VDDO3), each powering one output pair. This allows simultaneous generation of, for example, 1.8 V LVDS for an FPGA I/O bank and 3.3 V CMOS for a microcontroller - all from the same SI5338C-B04853-GM device without external level shifters.

How is the SI5338C-B04853-GM programmed, and what tools are required?

The SI5338C-B04853-GM is programmed via its I²C/SMBus interface using Skyworks' ClockBuilder Pro software, which provides GUI-based configuration, jitter analysis, and register file generation. The SI5338C-B04853-GM does not require external programming hardware - standard I²C master controllers or evaluation boards suffice for field updates and prototyping.

What is the minimum and maximum input reference frequency supported by the SI5338C-B04853-GM?

The SI5338C-B04853-GM accepts input references from 5 MHz to 710 MHz depending on interface type: 8–30 MHz for crystals, 5–200 MHz for CMOS, 5–350 MHz for SSTL/HSTL, and 5–710 MHz for differential inputs. The SI5338C-B04853-GM's MultiSynth™ architecture maintains 0 ppm synthesis accuracy across this full range when properly configured.