Skyworks Solutions Inc. SI5335A-B02062-GM

Overview

SI5335A-B02062-GM from Skyworks Solutions is a web-customizable, quad-output clock generator/buffer IC supporting four independent non-integer-related frequencies up to 350 MHz. It features MultiSynth fractional divider technology with 0 ppm synthesis error, PCIe Gen 1–4 common clock compliance, and dual selectable PLL loop bandwidths (1.6 MHz / 475 kHz). It serves as a single-device replacement for multiple crystal oscillators and clock ICs in high-speed serial interface timing systems.

For engineers reviewing the SI5335A-B02062-GM datasheet, SI5335A-B02062-GM pinout, SI5335A-B02062-GM application, or SI5335A-B02062-GM equivalent, key selection considerations include differential output format support (LVPECL/LVDS/HCSL/CML), per-output voltage configurability (1.5/1.8/2.5/3.3 V), loss-of-signal alarm, and pin-selectable frequency plans for multi-configuration system flexibility.

Technical Context

The SI5335A-B02062-GM implements a single high-performance PLL with patented MultiSynth fractional-N synthesis across four independent output banks. Each bank supports either one differential pair or two single-ended outputs, with full format and voltage configurability per driver. Input flexibility includes external crystal (25/27 MHz), CMOS (10–200 MHz), SSTL/HSTL (10–350 MHz), or differential (10–350 MHz) references.

It supports both clock generator mode (PLL active, 45 mA core current) and low-power clock buffer mode (PLL bypass, 12 mA core current), with programmable control pins (P1–P6) enabling spread spectrum enable, master/output enables, frequency plan selection (FS1/FS0), and reset. Loss-of-signal detection activates within 2.6–5 µs on CLKIN failure.

Key Specifications

Pinout & Package

The SI5335A-B02062-GM is housed in a 24-lead QFN package (4 mm × 4 mm) with an exposed thermal pad. Pin assignments are fixed per the Skyworks Si5335 family layout and validated for this variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SI5335A-B02062-GM, the Si5345A-D06189-GM adds jitter cleaning and higher output count but requires board redesign, while the ICS8430I-01LG offers lower cost and simpler layout at the expense of frequency agility, voltage flexibility, and PCIe Gen 4 readiness.

Availability

SI5335A-B02062-GM is available at Aetrix Electronics and suitable for PCIe Gen 4 timing, 10 GbE switch clocking, and broadcast video synchronization requiring stable component supply, factory-programmed configuration, and long-term lifecycle support.

Supply support for SI5335A-B02062-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 for wireless, broadband, automotive, and industrial markets.

The Si5335 product line delivers highly configurable, web-customizable clock generators targeting high-speed serial interface timing in servers, networking equipment, and telecom infrastructure where multi-frequency synthesis and PCIe compliance are critical.

FAQ

What is the primary function of the SI5335A-B02062-GM in a PCIe Gen 4 system?

The SI5335A-B02062-GM serves as a common clock generator delivering four low-jitter reference clocks (e.g., 100 MHz) compliant with PCIe Gen 4 specifications. It achieves ≤0.45 ps RMS jitter using its 1.6 MHz PLL loop bandwidth and HCSL output format, meeting the Base Specification 4.0 rev. 0.5 requirements without requiring external jitter cleaners. The SI5335A-B02062-GM also supports spread spectrum to reduce EMI in dense server backplanes.

Does the SI5335A-B02062-GM support both clock generator and clock buffer modes?

Yes, the SI5335A-B02062-GM operates in two distinct modes: clock generator mode (PLL active, 45 mA core current, full frequency synthesis) and clock buffer mode (PLL bypass, 12 mA core current, direct input-to-output path with 2.5–4 ns propagation delay). Mode selection is controlled via ClockBuilder Pro configuration and does not require external hardware changes. The SI5335A-B02062-GM maintains loss-of-signal detection and output enable functionality in both modes.

How many independent output voltage rails does the SI5335A-B02062-GM support?

The SI5335A-B02062-GM supports four independent output buffer supply rails: VDDO0, VDDO1, VDDO2, and VDDO3. Each rail powers one output bank and can be set to 1.5 V, 1.8 V, 2.5 V, or 3.3 V independently. This allows simultaneous interfacing with mixed-voltage components-such as 1.8 V FPGAs, 2.5 V SerDes, and 3.3 V legacy peripherals-without level shifters. The SI5335A-B02062-GM's per-bank voltage control is configured during ClockBuilder Pro programming and locked at power-up.

Can the SI5335A-B02062-GM generate non-integer-related output frequencies?

Yes, the SI5335A-B02062-GM uses Skyworks' patented MultiSynth fractional-N divider technology to synthesize four completely independent, non-integer-related output frequencies-from 1 MHz up to 350 MHz-with zero ppm frequency error. Unlike integer-N synthesizers, it avoids spurs and phase buildup, enabling clean clocking of heterogeneous subsystems (e.g., 100 MHz PCIe, 125 MHz Ethernet, 27 MHz video, 74.25 MHz SDI) from a single 25 MHz crystal. This capability is intrinsic to the SI5335A-B02062-GM architecture and verified across all production units.

What packaging and thermal characteristics apply to the SI5335A-B02062-GM?

The SI5335A-B02062-GM is packaged in a 24-pin QFN (4 mm × 4 mm, 0.5 mm pitch) with an exposed thermal pad connected to GND. Its thermal resistance θJA is 42 °C/W (JEDEC standard PCB), enabling operation from –40 °C to +85 °C ambient without forced airflow. The package supports standard reflow profiles and requires a 6×6 mm thermal land pattern per Skyworks AN937. The SI5335A-B02062-GM's low 45 mA core current in generator mode minimizes self-heating under full load.