Skyworks Solutions Inc. SI5342A-B03366-GMR

Overview

SI5342A-B03366-GMR from Skyworks is a 4-input, 2-output jitter attenuator/clock multiplier IC implementing fourth-generation DSPLL™ and MultiSynth™ architectures. It delivers ultra-low 90 fs rms jitter, supports differential (8 kHz–750 MHz) and LVCMOS (8 kHz–250 MHz) inputs, and generates programmable outputs up to 1028 MHz (differential) or 250 MHz (LVCMOS), targeting SyncE-compliant carrier Ethernet line cards.

For engineers reviewing the SI5342A-B03366-GMR datasheet, SI5342A-B03366-GMR pinout, SI5342A-B03366-GMR application, or SI5342A-B03366-GMR equivalent, key selection considerations include G.8262 EEC Option 1/2 compliance, digitally programmable jitter attenuation bandwidth (0.1 Hz–4 kHz), hitless/ramped input switching, DCO mode with 0.001 ppb step size, and support for LVDS/LVPECL/LVCMOS/CML/HCSL output formats.

Technical Context

The SI5342A-B03366-GMR integrates a fourth-generation DSPLL with fully on-chip loop filter and digitally programmable loop bandwidth (0.1 Hz–4 kHz), enabling precise jitter filtering without external components. Its MultiSynth architecture uses fractional-N synthesis for any-frequency output generation from any input frequency, with independent integer (R) and fractional (N) output dividers per channel.

It supports four operational modes-freerun, lock acquisition, locked, and holdover-with automatic or manual input clock switching, status monitoring (LOS/OOF/LOL), and glitchless on-the-fly frequency changes. The device includes in-circuit programmable OTP NVM, I²C/SPI interface, and configurable core supplies (VDD = 1.8 V ±5%, VDDA = 3.3 V ±5%).

Key Specifications

Pinout & Package

The SI5342A-B03366-GMR is housed in a 44-pin QFN package measuring 7 mm × 7 mm with exposed thermal pad, compatible with standard reflow profiles and supporting high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar jitter attenuator applications.

Compared with Si5342B-D-GM1, SI5342A-B03366-GMR offers broader frequency coverage (up to 1028 MHz) and fractional synthesis for flexible clock planning; versus LMK04832ISQE/NOPB, it integrates crystal oscillator and consumes less power but trades off maximum output frequency and additive jitter performance.

Availability

SI5342A-B03366-GMR is available at Aetrix Electronics and suitable for carrier Ethernet switches, OTN muxponders, broadcast video infrastructure, and test & measurement equipment requiring stable component supply across long product lifecycles.

Supply support for SI5342A-B03366-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 communications, industrial, and automotive markets.

The SI5342A-B03366-GMR belongs to Skyworks' Si534x family of jitter-attenuating clock multipliers, designed specifically for high-reliability telecom infrastructure requiring G.8262 SyncE compliance, hitless switching, and field-programmable timing flexibility.

FAQ

What is the primary function of the SI5342A-B03366-GMR in a timing architecture?

The SI5342A-B03366-GMR functions as a jitter-attenuating clock multiplier that cleans and regenerates timing signals from noisy or unstable references. It uses a fourth-generation DSPLL to suppress input jitter while generating two independent, ultra-low-jitter (90 fs rms) output clocks. This makes SI5342A-B03366-GMR essential in SyncE-compliant carrier Ethernet systems where phase noise directly impacts packet delay variation and service quality.

Does the SI5342A-B03366-GMR support both differential and single-ended input clocks?

Yes, the SI5342A-B03366-GMR supports four input channels (IN0–IN3) configurable for either differential (LVDS/LVPECL/CML) or single-ended LVCMOS signaling. Differential inputs accept 8 kHz–750 MHz, while LVCMOS inputs cover 8 kHz–250 MHz. Each input includes programmable termination and qualification logic, allowing SI5342A-B03366-GMR to synchronize reliably to diverse reference sources in telecom and broadcast equipment.

How does the SI5342A-B03366-GMR achieve G.8262 EEC Option 1 and 2 compliance?

The SI5342A-B03366-GMR achieves ITU-T G.8262 EEC Option 1 and 2 compliance through its ultra-low 90 fs rms jitter floor, digitally programmable DSPLL loop bandwidth (0.1 Hz–4 kHz), and holdover algorithms optimized for wander suppression. Its integrated crystal oscillator (25–54 MHz) and on-chip loop filter ensure stable free-run and holdover performance, while hitless switching preserves phase continuity during input failures - all verified per G.8262 Annex A test procedures.

Can the SI5342A-B03366-GMR generate different output frequencies simultaneously?

Yes, the SI5342A-B03366-GMR can generate two independent output frequencies simultaneously on OUT0 and OUT1. Each output is driven by a dedicated MultiSynth divider with fractional-N capability, supporting any combination of frequencies from 100 Hz to 1028 MHz (differential) or 250 MHz (LVCMOS). This allows SI5342A-B03366-GMR to serve multiple subsystems - e.g., 156.25 MHz for Ethernet MAC and 307.2 MHz for CPRI - from a single device.

Is factory preprogramming available for the SI5342A-B03366-GMR?

Yes, Skyworks offers factory preprogramming for the SI5342A-B03366-GMR using ClockBuilder Pro software. Preconfigured devices ship with NVM loaded with user-defined frequency plans, input priorities, holdover parameters, and output formats - eliminating field programming overhead. Custom part numbers follow the "Si5342A-Dxxxxx-GM" format, and SI5342A-B03366-GMR itself is a preprogrammed variant optimized for specific telecom timing use cases.