Skyworks Solutions Inc. SI5338K-B05614-GM

Overview

SI5338K-B05614-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 high-speed serial interface timing applications.

For engineers reviewing the SI5338K-B05614-GM datasheet, SI5338K-B05614-GM pinout, SI5338K-B05614-GM application, or SI5338K-B05614-GM equivalent, key selection considerations include its MultiSynth™-based any-frequency synthesis (0.16–710 MHz per output), independent output voltage control (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 support.

Technical Context

The SI5338K-B05614-GM implements a two-stage PLL architecture: a high-stability integer-N PLL (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 MultiSynth supports integer or fractional mode, enabling true zero-ppm frequency accuracy and <20 ps phase step resolution.

Its output stage provides per-driver configurability for LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL formats, with independent VDDO supplies and on-chip termination. Input-to-output propagation delay is 2.5–4 ns in buffer mode, and loss-of-signal/loss-of-lock alarms are supported via dedicated INTR pin.

Key Specifications

Pinout & Package

SI5338K-B05614-GM is housed in a 24-lead QFN package (4 × 4 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments follow the standard Si5338 top-view layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5332A-D05614-GM, SI5338K-B05614-GM offers greater reference flexibility and field programmability at the cost of slightly higher jitter and external crystal dependency; versus ICS854S01AGI-01LFT, it delivers full frequency agility and jitter performance essential for PCIe Gen 4 and 25G Ethernet.

Availability

SI5338K-B05614-GM is available at Aetrix Electronics and suitable for PCIe Gen 4 switch timing, 10/25GbE switch clocking, FPGA/ASIC clock distribution, and broadcast video sync generation requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for SI5338K-B05614-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 precision analog products for infrastructure, automotive, and industrial markets.

The SI5338 family is designed as a high-performance, software-programmable clock generator platform targeting high-speed serial interface timing in networking, computing, and broadcast equipment where multi-frequency agility and sub-ps jitter are critical.

FAQ

What is the maximum output frequency supported by SI5338K-B05614-GM?

The SI5338K-B05614-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. However, only two unique frequencies above 350 MHz can be generated simultaneously - specifically Fvco/4 and Fvco/6 - due to VCO architecture constraints confirmed in Table 6 and Section 3.3 of the datasheet.

Does SI5338K-B05614-GM support PCIe Gen 4 Common Clock compliance?

Yes, SI5338K-B05614-GM meets PCIe Gen 4 Common Clock jitter specifications with 0.15–0.45 ps RMS (10 kHz–50 MHz) when configured per AN562 test conditions using HCSL 100 MHz outputs and verified with the Skyworks PCIe Clock Jitter Tool. This compliance is explicitly stated in the Features section and Table 12.

Can SI5338K-B05614-GM generate four completely independent frequencies?

Yes, SI5338K-B05614-GM uses four independent MultiSynth™ fractional-N synthesizers, enabling truly independent frequency generation (e.g., 100.000000 MHz, 125.000001 MHz, 156.250002 MHz, 312.500003 MHz) with zero ppm accuracy and no integer relationship required between outputs.

What input reference options does SI5338K-B05614-GM support?

SI5338K-B05614-GM accepts six reference types: external crystal (8–30 MHz), CMOS (5–200 MHz), SSTL (5–350 MHz), HSTL (5–350 MHz), and two differential inputs (5–710 MHz each). All are validated in Table 6 and Section 3.2, with slew rate requirements specified for optimal jitter performance.

Is ClockBuilder Pro software required to configure SI5338K-B05614-GM?

No, ClockBuilder Pro is optional but strongly recommended: SI5338K-B05614-GM is fully programmable via standard I²C/SMBus commands, but ClockBuilder Pro provides GUI-based configuration, jitter optimization, register file generation, and validation against PCIe/Ethernet standards - significantly reducing development time versus manual register programming.