Skyworks Solutions Inc. SI5338F-B04077-GM

Overview

SI5338F-B04077-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 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 SI5338F-B04077-GM datasheet, SI5338F-B04077-GM pinout, SI5338F-B04077-GM application, or SI5338F-B04077-GM equivalent, key selection criteria include PCIe jitter compliance, independent output voltage per driver (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 I²C/SMBus programmability with ClockBuilder Pro support.

Technical Context

The SI5338F-B04077-GM implements a two-stage PLL architecture: a high-stability integer-N Phase-Locked Loop (Stage 1) locks to one of six input references (crystal, CMOS, SSTL/HSTL, or differential), followed by four independent MultiSynth™ fractional-N synthesizers (Stage 2) generating each output. Each output supports format- and voltage-selectable drivers (LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL) with programmable phase offset (±45 ns, <20 ps step) and glitchless frequency increment/decrement (1 ppm steps).

It operates from a single 1.8/2.5/3.3 V core supply with 45 mA typical current draw, integrates OTP NVM for factory or field programming, and provides loss-of-lock and loss-of-signal alarms via the INTR pin. External feedback mode enables zero-delay operation, and all outputs support independent spread-spectrum modulation (33–63 kHz rate, 0.5–5.0% spread) for EMI reduction.

Key Specifications

Pinout & Package

SI5338F-B04077-GM is housed in a 4 × 4 mm, 24-lead QFN package with exposed thermal pad. Pin assignments are fixed per the Si5338 family: inputs (IN1–IN6), outputs (CLK0A/B through CLK3A/B), power (VDD, VDDO0–VDDO3), control (SCL, SDA, INTR), and reserved ground (RSVD_GND).

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5332A-D06189-GM, SI5338F-B04077-GM offers broader output format and voltage flexibility at higher jitter; versus ICS853S02I, it provides full programmability and synthesis but requires external configuration infrastructure.

Availability

SI5338F-B04077-GM is available at Aetrix Electronics and suitable for PCIe Gen 4 switch timing, Ethernet switching/routing, and broadcast video timing applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for SI5338F-B04077-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 leader in analog semiconductors, specializing in RF, mobile, infrastructure, and timing solutions with over 30 years of RF and clock innovation.

The Si5338 product line was designed for high-performance, multi-protocol serial interface timing-including PCIe, Ethernet, Fibre Channel, and broadcast video-where flexible, low-jitter, software-configurable clock generation replaces discrete oscillator solutions.

FAQ

What is the primary function of the SI5338F-B04077-GM in a system?

The SI5338F-B04077-GM serves as an I²C-programmable quad clock generator that synthesizes up to four independent, low-jitter output frequencies from a single input reference. It replaces multiple discrete oscillators in systems like PCIe switches and Ethernet routers, enabling flexible, software-defined timing with zero-ppm accuracy per output via its MultiSynth™ architecture.

Does the SI5338F-B04077-GM support PCIe Gen 4 timing requirements?

Yes, the SI5338F-B04077-GM meets PCIe Gen 4 Common Clock jitter specifications (0.15–0.45 ps RMS, 10 kHz–50 MHz) when configured per Skyworks' AN562 guidelines and validated using the Skyworks PCIe Clock Jitter Tool. Its 0.7 ps RMS typical phase jitter and SRNS compliance make it suitable for Gen 3 and Gen 4 root complex and endpoint timing.

Can the SI5338F-B04077-GM generate different output formats simultaneously?

Yes, the SI5338F-B04077-GM supports simultaneous LVPECL, LVDS, HCSL, CMOS, SSTL, and HSTL outputs across its four channels. Each output bank (CLK0–CLK3) is independently configurable for format, voltage (1.5/1.8/2.5/3.3 V), and termination, enabling direct interfacing with heterogeneous devices such as FPGAs, ASICs, and memory controllers without level-shifting components.

How is the SI5338F-B04077-GM programmed and configured?

The SI5338F-B04077-GM is programmed via its I²C/SMBus-compatible serial interface using Skyworks' ClockBuilder Pro software. This GUI tool enables full register configuration-including frequency, format, voltage, spread spectrum, and phase offset-and generates custom configuration files for OTP programming or runtime loading. The device retains settings in on-chip OTP memory after power cycle.

What package type and thermal characteristics does the SI5338F-B04077-GM have?

The SI5338F-B04077-GM uses a 4 × 4 mm, 24-lead QFN package with exposed thermal pad. Its thermal resistance is θJA = 37 °C/W (still air) and θJC = 10 °C/W, supporting reliable operation up to +85 °C ambient. The package is RoHS-compliant and compatible with standard reflow profiles, including peak soldering temperature up to 260 °C per JEDEC J-STD-020.