Skyworks Solutions Inc. SI5338C-B04266-GM

Overview

SI5338C-B04266-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 from 1.8/2.5/3.3 V core supply. It replaces up to four crystal oscillators in high-speed serial interface timing applications.

For engineers reviewing the SI5338C-B04266-GM datasheet, SI5338C-B04266-GM pinout, SI5338C-B04266-GM application, or SI5338C-B04266-GM equivalent, key selection criteria include output format flexibility (LVPECL/LVDS/HCSL/CMOS/SSTL), independent per-output voltage (1.5–3.3 V), any-frequency synthesis (0.16–710 MHz), spread-spectrum control, and PCIe jitter compliance.

Technical Context

The SI5338C-B04266-GM implements a two-stage PLL architecture with a high-frequency VCO and patented MultiSynth™ fractional-N synthesis per output channel. Each of its four output drivers features independent frequency, phase, voltage, and format configuration - enabling true zero-ppm accuracy across all outputs without shared dividers.

It supports multiple reference inputs: external crystal (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), or differential (5–710 MHz). The device operates in either full PLL mode or low-additive-jitter clock buffer mode (PLL bypass), with loss-of-lock and loss-of-signal alarms for system monitoring.

Key Specifications

Pinout & Package

SI5338C-B04266-GM is housed in a 24-lead, 4 × 4 mm QFN package 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-D06983-GM and ICS853S01AGI-01LFT, SI5338C-B04266-GM delivers field-programmable any-frequency synthesis with PCIe Gen 4 compliance and flexible voltage/format per output - making it optimal for multi-protocol, multi-rate systems requiring design reuse and future-proofing without hardware revision.

Availability

SI5338C-B04266-GM is available at Aetrix Electronics and suitable for PCIe Gen 4 switch timing, Ethernet switch clocking, broadcast video sync generation, and FPGA-based test equipment requiring stable component supply across long production lifecycles.

Supply support for SI5338C-B04266-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 for wireless, broadband, automotive, and industrial markets.

The Si5338 product line was designed to replace multiple discrete timing components in high-speed serial interface systems, delivering programmable, low-jitter clock generation with minimal board area and power consumption.

FAQ

What is the maximum output frequency supported by SI5338C-B04266-GM in LVPECL mode?

The SI5338C-B04266-GM supports LVPECL outputs up to 710 MHz, as confirmed in Table 6 of the official datasheet. This capability applies when using differential outputs with appropriate termination and layout practices to maintain signal integrity and jitter performance. The device achieves this using its high-frequency VCO and MultiSynth™ synthesis engine, which maintains 0.7 ps RMS jitter even at upper-band frequencies.

Does SI5338C-B04266-GM support PCIe Gen 4 Common Clock compliance?

Yes, SI5338C-B04266-GM is explicitly specified for PCIe Gen 4 Common Clock compliance, with measured RMS jitter of 0.15–0.45 ps (10 kHz–50 MHz) under defined test conditions. This compliance is documented in Table 12 of the datasheet and verified using the Skyworks PCIe Clock Jitter Tool per Intel Clock Jitter Tool v1.6.4 methodology.

Can SI5338C-B04266-GM generate four completely independent output frequencies simultaneously?

Yes, SI5338C-B04266-GM uses four independent MultiSynth™ synthesis blocks, allowing truly independent frequency generation - for example, 100 MHz (PCIe), 125 MHz (GbE), 156.25 MHz (SerDes), and 200 MHz (processor) - all with zero ppm error and no shared dividers. Each output supports independent format, voltage, phase, and spread-spectrum settings.

What reference inputs does SI5338C-B04266-GM accept?

SI5338C-B04266-GM accepts four types of reference inputs: external crystal (8–30 MHz), single-ended CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), and differential (5–710 MHz). Input pins IN1/IN2 and IN5/IN6 are dedicated differential pairs; IN3/IN4 support single-ended signals. All inputs include loss-of-signal detection.

Is ClockBuilder Pro software required to configure SI5338C-B04266-GM?

No, ClockBuilder Pro is optional but strongly recommended for SI5338C-B04266-GM configuration. The device supports full I²C register-level programming, but ClockBuilder Pro provides GUI-driven setup, jitter optimization, PCIe compliance validation, and one-click configuration file generation - significantly reducing development time and risk of misconfiguration.