Skyworks Solutions Inc. SI5342D-B05951-GMR

Overview

SI5342D-B05951-GMR from Skyworks is a 4-input, 2-output jitter attenuating clock multiplier with DSPLL™ and MultiSynth™ architecture. 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), meeting ITU-T G.8262 EEC Option 1/2 for Synchronous Ethernet in carrier-grade networking line cards.

For engineers reviewing the SI5342D-B05951-GMR datasheet, SI5342D-B05951-GMR pinout, SI5342D-B05951-GMR application, or SI5342D-B05951-GMR equivalent, key selection considerations include its 2-output 44-QFN 7×7 mm package, factory-programmed configuration (B05951), G.8262 SyncE compliance, programmable jitter attenuation bandwidth (0.1 Hz–4 kHz), and support for hitless/ramped/glitchless input switching in telecom timing systems.

Technical Context

The SI5342D-B05951-GMR implements a fourth-generation DSPLL with fully integrated loop filter and digitally programmable jitter attenuation bandwidth (0.1 Hz–4 kHz), enabling precise optimization of jitter filtering for specific network timing requirements. Its MultiSynth output dividers support both integer and fractional synthesis, allowing any-output-frequency generation from any-input-frequency within specified ranges.

It operates in free-run, locked, holdover, and zero-delay modes, with automatic/manual input clock switching, status monitoring (LOS/OOF/LOL), and DCO mode offering 0.001 ppb step size. Core supply is 1.8 V ±5% (VDD), analog supply 3.3 V ±5% (VDDA), and independent output supplies support 3.3 V/2.5 V/1.8 V levels.

Key Specifications

Pinout & Package

SI5342D-B05951-GMR uses a 44-pin QFN package (7 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined per Skyworks Si5342 Rev D datasheet Section 9 (Pin Descriptions).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SI5342D-B05951-GMR, Si5342C-D-GM1 sacrifices fractional synthesis for lower unit cost in fixed-ratio applications, while LMK04832RHAT offers dual-loop programmability at the expense of higher jitter and external component count-making SI5342D-B05951-GMR optimal for compact, ultra-low-jitter SyncE timing where factory-programmed configuration ensures first-time-right deployment.

Availability

SI5342D-B05951-GMR is available at Aetrix Electronics and suitable for OTN transponders, Carrier Ethernet switches, broadcast video infrastructure, and test & measurement equipment requiring stable component supply, guaranteed long-term availability, and pre-validated timing performance.

Supply support for SI5342D-B05951-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 Si5342 family is designed specifically for high-performance jitter attenuation and clock multiplication in carrier-grade networking and synchronization-critical infrastructure, emphasizing G.8262 compliance, field-upgradable configuration, and robust holdover behavior.

FAQ

What is the factory-programmed configuration of SI5342D-B05951-GMR?

The SI5342D-B05951-GMR is a factory-preprogrammed variant of the Si5342D jitter attenuator. The "B05951" suffix indicates a specific, non-volatile memory (NVM)-stored configuration optimized for a defined set of input/output frequencies, loop bandwidth, and output formats-eliminating the need for in-system programming during manufacturing. This configuration is verified and locked by Skyworks prior to shipment, ensuring SI5342D-B05951-GMR powers up immediately with operational timing parameters.

Does SI5342D-B05951-GMR support Synchronous Ethernet (SyncE)?

Yes, SI5342D-B05951-GMR meets ITU-T G.8262 EEC Option 1 and Option 2 specifications for Synchronous Ethernet. Its ultra-low 90 fs rms jitter, programmable jitter attenuation bandwidth (0.1 Hz–4 kHz), and holdover stability-enabled by 120-second frequency history averaging-ensure compliance in carrier-class Ethernet switches and line cards where phase accuracy and wander tolerance are strictly mandated.

What package type and thermal characteristics does SI5342D-B05951-GMR use?

SI5342D-B05951-GMR uses a 44-pin QFN package measuring 7 mm × 7 mm with 0.5 mm pitch and an exposed thermal pad. Its thermal resistance (θ_JA) is 36.5 °C/W, and it operates across –40 °C to +85 °C. The package supports standard reflow profiles and requires proper PCB copper pour under the thermal pad for reliable power dissipation in high-density telecom modules.

Can SI5342D-B05951-GMR perform hitless switching between input clocks?

Yes, SI5342D-B05951-GMR supports hitless input switching when transitioning between two input clocks that are frequency-locked or fractionally related (e.g., 155.52 MHz and 622.08 MHz). The DSPLL absorbs phase differences internally, preventing output phase transients-a critical capability for maintaining bit-error-free operation during protection switching in SONET/SDH and OTN systems where SI5342D-B05951-GMR is deployed.

What are the supported output signal formats for SI5342D-B05951-GMR?

SI5342D-B05951-GMR supports LVDS, LVPECL, LVCMOS, CML, and HCSL output formats on both OUT0 and OUT1. Each output driver is independently configurable for format, amplitude, common-mode voltage (for differential), and slew rate. LVCMOS outputs support 1.8 V/2.5 V/3.3 V logic levels with programmable drive strength, enabling direct interfacing with FPGAs, ASICs, and SerDes PHYs without level-shifting components.