Skyworks Solutions Inc. SI5338A-B05922-GM

Overview

SI5338A-B05922-GM from Skyworks Solutions is a quad-output, I²C-programmable clock generator implementing MultiSynth™ frequency synthesis with 0 ppm precision per output, 0.7 ps RMS typical phase jitter, PCIe Gen 1–4 Common Clock and Gen 3 SRNS compliance, and support for LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL output formats across 0.16–710 MHz. It replaces up to four crystal oscillators in high-speed serial interface timing applications.

For engineers reviewing the SI5338A-B05922-GM datasheet, SI5338A-B05922-GM pinout, SI5338A-B05922-GM application, or SI5338A-B05922-GM equivalent, key selection considerations include its 24-QFN package, independent output voltage per driver (1.5/1.8/2.5/3.3 V), flexible reference inputs (crystal, CMOS, differential), and glitchless 1 ppm frequency increment/decrement capability.

Technical Context

The SI5338A-B05922-GM integrates a two-stage PLL architecture: a high-performance integer-N PLL (Stage 1) locks to an input reference (8–30 MHz crystal or 5–710 MHz external clock), followed by four independent MultiSynth™ fractional-N synthesizers (Stage 2) generating outputs with sub-ppb resolution. Each output path includes configurable drivers, programmable phase offset (±45 ns), and spread-spectrum control.

It supports both free-running synthesis and synchronous frequency translation modes, with loss-of-lock and loss-of-signal alarms, external feedback for zero-delay operation, and I²C/SMBus programming. Core supply operates at 1.8/2.5/3.3 V; each output bank (VDDO0–VDDO3) is independently powered for mixed-voltage system interfacing.

Key Specifications

Pinout & Package

SI5338A-B05922-GM is housed in a 24-lead QFN package (4 mm × 4 mm, 0.5 mm pitch) with an exposed thermal pad. Pin assignments are fixed per the Si5338 family and verified in Skyworks Rev. 1.6 datasheet Figure 1 (Top View).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SI5338A-B05922-GM, the Si5338A-B05923-GM offers identical performance with factory-tuned defaults, reducing firmware bring-up time, while the LMK04832 provides superior jitter cleaning and more outputs at the cost of larger size and higher complexity-making SI5338A-B05922-GM optimal for compact, cost-sensitive any-frequency synthesis.

Availability

SI5338A-B05922-GM is available at Aetrix Electronics and suitable for PCIe Gen 4 switch timing, Ethernet switching/routing, and broadcast video timing requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for SI5338A-B05922-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, timing, and connectivity solutions for wireless infrastructure, automotive, and industrial markets.

The Si5338 product line delivers highly configurable, low-jitter clock generation for high-speed serial interfaces-including PCIe, Ethernet, Fibre Channel, and broadcast video-enabling system architects to consolidate timing functions into a single programmable IC.

FAQ

What is the primary function of the SI5338A-B05922-GM?

The SI5338A-B05922-GM is a quad-output, I²C-programmable clock generator using Skyworks' MultiSynth™ technology to synthesize any frequency from 0.16 MHz to 710 MHz on each output with 0 ppm precision. It serves as a drop-in replacement for up to four discrete crystal oscillators in applications demanding low phase jitter (0.7 ps RMS typical), PCIe Gen 4 compliance, and flexible signal format support.

Does the SI5338A-B05922-GM support PCIe Gen 4 timing requirements?

Yes, the SI5338A-B05922-GM meets PCIe Gen 4 common clock jitter specifications per the PCI-SIG Base Specification 4.0 rev. 0.5, delivering 0.15–0.45 ps RMS jitter (12 kHz–20 MHz) when configured with PLL bandwidth 2–5 MHz and CDR = 10 MHz. It is explicitly validated for PCIe Gen 1/2/3/4 Common Clock and Gen 3 SRNS modes.

How many independent output voltage supplies does the SI5338A-B05922-GM support?

The SI5338A-B05922-GM supports four independent output buffer supply rails-VDDO0, VDDO1, VDDO2, and VDDO3-each configurable for 1.5 V, 1.8 V, 2.5 V, or 3.3 V. This allows direct interfacing with mixed-voltage devices (e.g., 1.8 V FPGA I/O banks and 3.3 V legacy peripherals) without external level shifters.

Can the SI5338A-B05922-GM generate different frequencies simultaneously on its four outputs?

Yes, the SI5338A-B05922-GM synthesizes four fully independent output frequencies using separate MultiSynth™ engines. Each output supports distinct frequencies (e.g., 100 MHz, 125 MHz, 156.25 MHz, 312.5 MHz), formats (LVDS, HCSL, CMOS), and supply voltages-all programmable via I²C. No shared dividers or constraints bind the outputs.

What reference inputs are compatible with the SI5338A-B05922-GM?

The SI5338A-B05922-GM accepts multiple reference types: 8–30 MHz fundamental-mode crystals (with on-chip load capacitance tuning), 5–200 MHz CMOS single-ended clocks (on IN3/IN4), 5–350 MHz SSTL/HSTL inputs (on IN3/IN4), and 5–710 MHz differential clocks (on IN1/IN2, IN5/IN6). All inputs support loss-of-signal detection.