Skyworks Solutions Inc. SI5338A-B04519-GMR

Overview

SI5338A-B04519-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 SI5338A-B04519-GMR datasheet, SI5338A-B04519-GMR pinout, SI5338A-B04519-GMR application, or SI5338A-B04519-GMR equivalent, key selection criteria include PCIe Gen 4 jitter compliance (0.15–0.45 ps RMS), independent output voltage per driver (1.5/1.8/2.5/3.3 V), MultiSynth™ fractional synthesis resolution (1 ppb), spread-spectrum control (0.5–5.0% down-spread), and I²C/SMBus programmability with ClockBuilder Pro support.

Technical Context

The SI5338A-B04519-GMR implements a two-stage PLL architecture: a high-stability reference stage (with crystal or external clock input) followed by four independent MultiSynth™ synthesis blocks, each driving one output pair. Each MultiSynth supports integer or fractional-N division with <20 ps programmable phase step accuracy and 1 ppm frequency increment/decrement capability.

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 output frequencies from 0.16 MHz to 710 MHz across LVPECL, LVDS, HCSL, CML, CMOS, SSTL, and HSTL formats, with independent VDDO per output bank (1.4–3.63 V).

Key Specifications

Pinout & Package

SI5338A-B04519-GMR uses a 24-lead QFN package (4 × 4 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments are fixed per Si5338 family specification.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5332A-D08519-GM and ICS8430I-01T, SI5338A-B04519-GMR uniquely balances field-programmability, PCIe Gen 4 compliance, and industrial temperature range in a compact QFN-making it optimal for reconfigurable, high-speed serial interface timing where design flexibility and jitter margin are critical.

Availability

SI5338A-B04519-GMR is available at Aetrix Electronics and suitable for PCIe Gen 4 switch timing, Ethernet switch synchronization, broadcast video frame sync, and FPGA-based telecom line card applications requiring stable component supply and long-term manufacturability.

Supply support for SI5338A-B04519-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 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 multi-protocol serial interfaces-including PCIe, Ethernet, Fibre Channel, and broadcast video-where low jitter, format flexibility, and field reprogrammability are essential.

FAQ

What is the maximum output frequency supported by SI5338A-B04519-GMR?

The SI5338A-B04519-GMR supports up to 710 MHz on LVPECL/LVDS/CML outputs and 350 MHz on SSTL/HSTL outputs. For frequencies above 350 MHz, only two unique outputs may operate simultaneously-specifically at Fvco/4 and Fvco/6-due to VCO bandwidth constraints. This limitation is documented in Table 6 of the official Skyworks datasheet Rev. 1.6.

Does SI5338A-B04519-GMR support PCIe Gen 4 Common Clock compliance?

Yes, SI5338A-B04519-GMR meets PCIe Gen 4 Common Clock jitter specifications per Table 12 of the Skyworks datasheet Rev. 1.6: 0.15–0.45 ps RMS (10 kHz–50 MHz). It achieves this with its low-noise MultiSynth™ architecture, optimized loop bandwidth (2–5 MHz), and support for PCIe-specific CDR settings. Validation was performed using the Skyworks PCIe Clock Jitter Tool and Intel Clock Jitter Tool v1.6.4.

Can SI5338A-B04519-GMR generate different output voltages on each channel?

Yes, SI5338A-B04519-GMR provides independent VDDO supplies (VDDO0–VDDO3) for each of its four output banks, allowing configuration of 1.5 V, 1.8 V, 2.5 V, or 3.3 V per bank. This enables mixed-signal systems-such as those combining 1.8 V FPGAs and 3.3 V legacy peripherals-to receive properly terminated clocks without external level shifters.

How is SI5338A-B04519-GMR programmed in-system?

SI5338A-B04519-GMR is programmed via its I²C/SMBus-compatible interface (SCL/SDA pins) operating at up to 400 kHz. Configuration is typically performed using Skyworks' ClockBuilder Pro software, which generates register maps and supports GUI-based frequency/phase/format setup. The device retains settings in one-time-programmable (OTP) memory after power-on initialization.

What crystal frequency ranges does SI5338A-B04519-GMR support?

SI5338A-B04519-GMR supports external crystals from 8 to 30 MHz in four bands: 8–11 MHz, 11–19 MHz, 19–26 MHz, and 26–30 MHz. Each band has specified load capacitance (11–13 pF supported, 17–19 pF recommended), ESR limits (≤300 Ω), and drive level (≤100 µW), as defined in Tables 8–11 of the Skyworks datasheet Rev. 1.6.