Skyworks Solutions Inc. SI5338J-B04983-GM

Overview

SI5338J-B04983-GM from Skyworks Solutions is a quad-output, I²C-programmable clock generator with MultiSynth™ frequency synthesis, delivering four independent differential or single-ended clocks (0.16–710 MHz), 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 SI5338J-B04983-GM datasheet, SI5338J-B04983-GM pinout, SI5338J-B04983-GM application, or SI5338J-B04983-GM equivalent, this device supports precise any-frequency synthesis, independent output voltage per driver (1.5–3.3 V), glitchless 1 ppm frequency adjustment, <20 ps phase step resolution, and spread-spectrum control for EMI reduction - critical for PCIe, Ethernet, and FPGA clocking designs.

Technical Context

The SI5338J-B04983-GM 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, enabling integer- or fractional-mode generation across four independent outputs. Each output path includes programmable divider chains (R/M/N/P), configurable output drivers, and dedicated voltage supplies (VDDO0–VDDO3).

It supports flexible reference inputs: 8–30 MHz crystal, 5–200 MHz CMOS, 5–350 MHz SSTL/HSTL, or 5–710 MHz differential; and delivers output formats including LVPECL (0.16–710 MHz), LVDS (0.16–350 MHz), HCSL (0.16–250 MHz), CMOS (0.16–200 MHz), and SSTL/HSTL (0.16–350 MHz), all with independent format and voltage selection.

Key Specifications

Pinout & Package

SI5338J-B04983-GM is housed in a 24-lead, 4 × 4 mm QFN package with wettable flank leads and an exposed thermal pad (pin 24 = GND). The package supports reflow soldering per JEDEC J-STD-020 (peak 260 °C) and provides low thermal resistance (θJA = 37 °C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5332A-D05889-GM and ICS853S02IAGLF, SI5338J-B04983-GM uniquely balances field-programmability, PCIe Gen 4 compliance, spread-spectrum EMI control, and per-output voltage/format flexibility - making it optimal for adaptable, multi-standard timing in networking and compute platforms where reference agility and layout efficiency are critical.

Availability

SI5338J-B04983-GM is available at Aetrix Electronics and suitable for PCIe Gen 4 switch designs, 100 GbE line cards, and FPGA-based broadcast video equipment requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for SI5338J-B04983-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 precision timing, RF, and connectivity solutions for high-performance communications infrastructure.

The Si5338 family was engineered for high-density, multi-protocol timing in next-generation networking and computing systems - delivering programmable, low-jitter clock synthesis in compact QFN packages to replace discrete oscillator arrays.

FAQ

What is the primary function of the SI5338J-B04983-GM in a system?

The SI5338J-B04983-GM serves as a quad-output, I²C-programmable clock generator that synthesizes four independent, low-jitter clock signals from a single reference. Its MultiSynth™ technology enables precise any-frequency generation (0.16–710 MHz) with 0 ppm accuracy, replacing multiple discrete oscillators in applications like PCIe Gen 4, Ethernet switches, and FPGA clock trees. SI5338J-B04983-GM integrates flexible input support, per-output voltage control, and spread-spectrum capability to simplify timing architecture.

Does the SI5338J-B04983-GM support PCIe Gen 4 Common Clock mode?

Yes, the SI5338J-B04983-GM is explicitly specified for PCIe Gen 4 Common Clock mode, delivering ≤0.45 ps RMS jitter (10 kHz–50 MHz) when configured with HCSL outputs at 100 MHz. It meets the PCI-SIG Gen 4 jitter mask under standard operating conditions (VDD = 3.3 V, TA = 25 °C) and supports the required PLL loop bandwidth (2–5 MHz) and CDR rate (10 MHz). SI5338J-B04983-GM also complies with PCIe Gen 3 SRNS and Gen 1/2/3 Common Clock specifications.

How many different output voltage levels can be configured simultaneously on the SI5338J-B04983-GM?

The SI5338J-B04983-GM supports four independent output buffer supply rails (VDDO0–VDDO3), each configurable for 1.5 V, 1.8 V, 2.5 V, or 3.3 V. This allows simultaneous operation of up to four distinct output voltage levels - for example, driving a 1.8 V FPGA transceiver bank, a 2.5 V SerDes PHY, a 3.3 V legacy controller, and a 1.5 V memory interface - without external level shifters. SI5338J-B04983-GM's per-driver voltage control is hardware-configurable via I²C registers and retained in OTP memory.

Can the SI5338J-B04983-GM generate frequencies above 350 MHz on all four outputs?

No - the SI5338J-B04983-GM can generate frequencies above 350 MHz on only two outputs simultaneously, specifically at Fvco/4 and Fvco/6 (e.g., 367–473.33 MHz or 550–710 MHz), due to VCO frequency constraints and synthesis stage limitations. All four outputs support 0.16–350 MHz continuously. SI5338J-B04983-GM's datasheet explicitly restricts >350 MHz operation to two unique frequencies at a time, regardless of output format (LVPECL, LVDS, or HCSL).

What programming interface does the SI5338J-B04983-GM use, and is external hardware required?

The SI5338J-B04983-GM uses a standard I²C/SMBus-compatible 2-wire serial interface (SCL/SDA) for full register configuration, status monitoring, and OTP programming. No external hardware programmer is required: configuration is performed using Skyworks' ClockBuilder Pro software, which generates custom configuration files and supports in-system programming via USB-to-I²C adapters or host processor GPIO. SI5338J-B04983-GM retains settings in one-time-programmable (OTP) memory after power cycle.