Skyworks Solutions Inc. SI5338A-B05859-GM

Overview

SI5338A-B05859-GM 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 FPGA/processor clocking, PCIe timing, and broadcast video systems.

For engineers reviewing the SI5338A-B05859-GM datasheet, SI5338A-B05859-GM pinout, SI5338A-B05859-GM application, or SI5338A-B05859-GM equivalent, key selection criteria include its MultiSynth™-based any-frequency synthesis (0.16–710 MHz per output), independent output voltage support (1.5/1.8/2.5/3.3 V), spread-spectrum capability (0.5–5.0% down-spread), and I²C/SMBus programmability with ClockBuilder Pro software integration.

Technical Context

The SI5338A-B05859-GM implements a two-stage PLL architecture: a high-stability reference stage (with crystal or external clock input) followed by four independent MultiSynth™ fractional-N synthesis paths, each feeding a configurable output driver. This enables true zero-ppm frequency accuracy on all outputs without shared dividers or frequency coupling.

Each output supports LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL formats with independent supply rails (VDDO0–VDDO3), programmable phase offset (<20 ps step resolution), and glitchless frequency increment/decrement in 1 ppm steps. Input flexibility includes differential (5–710 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), and crystal (8–30 MHz) references.

Key Specifications

Pinout & Package

SI5338A-B05859-GM uses a 24-pin QFN package (4 × 4 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined per Skyworks Rev. 1.6 datasheet, with dedicated differential inputs (IN1/IN2, IN5/IN6), single-ended inputs (IN3/IN4), four differential output pairs (CLK0A/B through CLK3A/B), I²C interface (SCL/SDA), interrupt (INTR), and independent output supply pins (VDDO0–VDDO3).

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5332A-D05859-GM and ICS843002AGI-01LFT, the SI5338A-B05859-GM uniquely balances field-programmability, PCIe Gen 4 readiness, and compact 24-QFN packaging-making it optimal for mid-complexity embedded systems requiring design reuse across multiple clock configurations without hardware respins.

Availability

SI5338A-B05859-GM is available at Aetrix Electronics and suitable for PCIe timing, Ethernet switch/router development, and broadcast video equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for SI5338A-B05859-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, with leadership in RF, timing, and power management ICs for communications, automotive, and industrial markets.

The SI5338A-B05859-GM belongs to Skyworks' Si5338 family of programmable clock generators, designed specifically for high-performance, multi-protocol timing in compute, networking, and media infrastructure where flexible, low-jitter clock synthesis replaces discrete oscillator arrays.

FAQ

What is the maximum output frequency supported by the SI5338A-B05859-GM?

The SI5338A-B05859-GM supports up to 710 MHz on LVPECL/LVDS/CML outputs, 350 MHz on SSTL/HSTL, 250 MHz on HCSL, and 200 MHz on CMOS outputs. Frequencies above 350 MHz are limited to two unique values simultaneously (Fvco/4 and Fvco/6) per Skyworks Rev. 1.6 datasheet Section 3.3.

Does the SI5338A-B05859-GM support PCIe Gen 4 Common Clock compliance?

Yes, the SI5338A-B05859-GM meets PCIe Gen 4 Common Clock jitter specifications (≤0.45 ps RMS, 10 kHz–50 MHz) per Table 12 of the Skyworks datasheet, verified using the Skyworks PCIe Clock Jitter Tool and Intel Clock Jitter Tool v1.6.4 with 100 MHz HCSL outputs.

Can the SI5338A-B05859-GM generate different output voltages on each channel?

Yes - the SI5338A-B05859-GM provides independent VDDO0–VDDO3 supply pins, allowing each of its four output pairs to operate at 1.5 V, 1.8 V, 2.5 V, or 3.3 V simultaneously. This enables direct interfacing with mixed-voltage FPGA I/O banks or ASIC clock inputs without level shifters.

How is the SI5338A-B05859-GM programmed, and is external nonvolatile memory required?

The SI5338A-B05859-GM is programmed via I²C/SMBus interface using Skyworks' ClockBuilder Pro software. It contains on-chip OTP NVM that stores configuration; no external EEPROM is required for factory-programmed startup behavior. Runtime reprogramming is fully supported.

What input reference options does the SI5338A-B05859-GM support?

The SI5338A-B05859-GM accepts eight input reference types: 8–30 MHz crystal (differential), 5–200 MHz CMOS, 5–350 MHz SSTL/HSTL, and 5–710 MHz differential (LVDS/LVPECL/CML). All inputs support automatic loss-of-signal detection with configurable timeout thresholds.