Skyworks Solutions Inc. SI5335D-B04718-GMR

Overview

SI5335D-B04718-GMR from Skyworks Solutions is a web-customizable quad clock generator/buffer IC with four independent, non-integer-related output frequencies up to 350 MHz, low phase jitter of 0.7 ps RMS, PCIe Gen 1–4 common clock compliance, and configurable output formats (LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL/CML) per bank. It serves as a single-device replacement for multiple clock ICs in high-speed serial interface timing systems.

For engineers reviewing the SI5335D-B04718-GMR datasheet, SI5335D-B04718-GMR pinout, SI5335D-B04718-GMR application, or SI5335D-B04718-GMR equivalent, key selection criteria include its MultiSynth fractional synthesis architecture, dual PLL loop bandwidth options (1.6 MHz / 475 kHz), loss-of-signal alarm, five user-assignable control pins, and factory-programmable configuration via ClockBuilder Pro.

Technical Context

The SI5335D-B04718-GMR implements Skyworks' patented MultiSynth fractional divider technology across four independent synthesis paths, guaranteeing 0 ppm frequency synthesis error regardless of output frequency or format combination. Its dual-loop-bandwidth PLL supports jitter attenuation for PCIe (1.6 MHz) and DSL (475 kHz) applications.

Input flexibility includes external crystal (25/27 MHz), CMOS (10–200 MHz), SSTL/HSTL (10–350 MHz), or differential (10–350 MHz) references. Each of the four output banks supports one differential pair or two single-ended outputs, with independent voltage selection (1.5/1.8/2.5/3.3 V) and format assignment.

Key Specifications

Pinout & Package

The SI5335D-B04718-GMR is housed in a 24-lead QFN package (4 mm × 4 mm) with an exposed thermal pad. Pin assignments are fixed per the Si5335 family specification and validated for this variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si5332A-D05889-GM, SI5335D-B04718-GMR offers faster time-to-customization (2-week factory programming) and broader input reference support, while ICS8430I-01T provides simpler, lower-cost buffering where synthesis is unnecessary.

Availability

SI5335D-B04718-GMR is available at Aetrix Electronics and suitable for PCIe Gen 4 timing, Ethernet switching, and broadcast video applications requiring stable component supply, long-term lifecycle assurance, and factory-programmed configurations.

Supply support for SI5335D-B04718-GMR 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 flexible, web-customizable clock generation for high-speed serial interfaces, designed to replace multiple discrete timing components with a single programmable IC in datacenter, telecom, and broadcast systems.

FAQ

What is the primary function of the SI5335D-B04718-GMR?

The SI5335D-B04718-GMR is a quad-output, any-frequency clock generator/buffer IC that synthesizes four independent, non-integer-related clock frequencies up to 350 MHz using Skyworks' MultiSynth fractional divider technology. It operates as either a full PLL-based generator or a low-latency buffer (PLL bypass mode), and SI5335D-B04718-GMR supports PCIe Gen 1–4, Ethernet, and broadcast timing standards with 0.7 ps RMS phase jitter.

Does the SI5335D-B04718-GMR support spread spectrum clocking?

Yes, the SI5335D-B04718-GMR supports PCIe-compliant spread spectrum clocking via the SSENB control pin. It delivers –0.45% to –0.5% down-spread modulation at 31.5 kHz by default, and this feature is fully configurable through ClockBuilder Pro. The SI5335D-B04718-GMR implements spread spectrum without degrading jitter performance beyond PCIe specifications.

What output formats and voltage levels does the SI5335D-B04718-GMR support?

The SI5335D-B04718-GMR supports LVPECL, LVDS, HCSL, CML, CMOS, SSTL, and HSTL output formats across its four banks. Each bank has an independent VDDO supply (1.5 V, 1.8 V, 2.5 V, or 3.3 V), allowing mixed-voltage operation on a single device. For example, CLK0A/B can be LVPECL at 3.3 V while CLK2A/B runs as CMOS at 1.8 V - all simultaneously enabled in SI5335D-B04718-GMR.

How is the SI5335D-B04718-GMR configured for custom frequencies?

The SI5335D-B04718-GMR is factory-configured using Skyworks' ClockBuilder Pro web utility, which generates a custom configuration file based on user-defined input reference, output frequencies, formats, and control pin functions. Once programmed, SI5335D-B04718-GMR operates autonomously with no external programming required - delivering the specified timing solution in as little as two weeks with no MOQ.

What is the role of the LOS (Loss of Signal) pin on the SI5335D-B04718-GMR?

The LOS pin on the SI5335D-B04718-GMR is an open-drain output that asserts low within 2.6–5 µs of detecting loss of valid input clock on XA/XB pins. It provides real-time fault indication for system monitoring and fail-safe clock switchover logic. This feature is active in both PLL and buffer modes and is fully integrated into SI5335D-B04718-GMR's internal detection circuitry without external components.