Skyworks Solutions Inc. SI5342D-B04156-GMR

Overview

SI5342D-B04156-GMR from Skyworks is a 4-input, 2-output jitter attenuating clock multiplier with fourth-generation 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 350 MHz in LVDS/LVPECL/LVCMOS/CML/HCSL formats - deployed in SyncE-compliant carrier Ethernet switches and OTN transponders.

For engineers reviewing the SI5342D-B04156-GMR datasheet, SI5342D-B04156-GMR pinout, SI5342D-B04156-GMR application, or SI5342D-B04156-GMR equivalent, key selection criteria include G.8262 EEC Option 1/2 compliance, digitally programmable jitter attenuation bandwidth (0.1 Hz–4 kHz), hitless/ramped input switching, DCO mode (0.001 ppb step), and factory-programmable NVM configuration for lock-to-reference stability in holdover mode.

Technical Context

The SI5342D-B04156-GMR implements a fourth-generation DSPLL with integrated loop filter and digitally configurable bandwidth (0.1 Hz–4 kHz), enabling precise jitter filtering without external components. Its MultiSynth architecture uses fractional-N synthesis (Mn/Md) and integer-R division to generate any output frequency from any input, supporting both integer-only and fractional synthesis modes per its Si5342D variant designation.

It operates across freerun, locked, holdover, and zero-delay modes, with automatic/manual input switching, status monitoring (LOS/OOF/LOL), and glitchless on-the-fly output reconfiguration. Core supply is 1.8 V ±5% (VDD), analog supply 3.3 V ±5% (VDDA), and independent output supplies support 1.8 V/2.5 V/3.3 V levels for signal integrity optimization.

Key Specifications

Pinout & Package

SI5342D-B04156-GMR is housed in a 44-pin QFN package (7×7 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined per Skyworks Si5342 Rev D datasheet Section 9 (Pin Descriptions), with dedicated power, ground, reference (XA/XB), four clock inputs (IN0–IN3), two outputs (OUT0/OUT1), I²C/SPI interface, and status/control pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SI5342D-B04156-GMR, Si5342C-D-GM1 trades synthesis flexibility for cost efficiency in fixed-ratio designs, while Si5344B-D-GM1 extends functionality with two more outputs at no jitter or package penalty - making it ideal for scalable timing architectures where future expansion is anticipated.

Availability

SI5342D-B04156-GMR is available at Aetrix Electronics and suitable for carrier Ethernet switches, OTN transponders, broadcast video infrastructure, and test & measurement equipment requiring stable component supply, long-term lifecycle assurance, and G.8262-compliant jitter performance.

Supply support for SI5342D-B04156-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 for high-reliability timing in telecom infrastructure - delivering ultra-low jitter, programmable holdover, and robust input switching for SyncE, OTN, and broadcast video applications.

FAQ

What is the maximum output frequency supported by SI5342D-B04156-GMR?

The SI5342D-B04156-GMR supports a maximum output frequency of 350 MHz, consistent with its Si5342D variant designation in the Skyworks ordering guide. This limit applies regardless of output format (LVDS, LVPECL, LVCMOS, CML, or HCSL) and is enforced by internal frequency synthesis constraints - not package or drive strength limitations. Higher frequencies up to 1028 MHz are supported only by Si5342A/C variants.

Does SI5342D-B04156-GMR support both I²C and SPI interfaces?

Yes, SI5342D-B04156-GMR supports both I²C and SPI serial interfaces for configuration and status monitoring. Interface selection is determined by hardware pin strapping (SPI_EN) and register settings. I²C uses SCL/SDA pins with standard 100 kHz/400 kHz modes; SPI supports up to 25 MHz clock rate with CSb, SCLK, SDIO, and SDO pins - enabling flexible integration into microcontroller- or FPGA-based timing control subsystems.

How does the holdover function work in SI5342D-B04156-GMR?

During holdover, SI5342D-B04156-GMR calculates an averaged frequency from up to 120 seconds of prior locked-history data, using a programmable window and delay to exclude corrupted pre-failure samples. The DSPLL then pulls output frequency to this averaged value using the configured loop bandwidth. Holdover stability depends entirely on the XA/XB crystal (25–54 MHz); TCXO is recommended for <1 ppm drift in extended holdover scenarios.

Is SI5342D-B04156-GMR compliant with ITU-T G.8262 for Synchronous Ethernet?

Yes, SI5342D-B04156-GMR meets ITU-T G.8262 EEC Option 1 and Option 2 specifications for Synchronous Ethernet equipment clocks. This compliance is achieved through its 90 fs rms jitter performance, programmable jitter attenuation bandwidth (0.1 Hz–4 kHz), and holdover stability - verified under full industrial temperature range (–40°C to +85°C) and validated in Skyworks' SyncE reference designs.

Can SI5342D-B04156-GMR perform hitless switching between unrelated input frequencies?

No, SI5342D-B04156-GMR requires input frequencies to be either identical or fractionally related (e.g., 100 MHz and 125 MHz) for hitless switching. Unrelated frequencies (e.g., 100 MHz and 156.25 MHz) trigger glitchless switching instead - where the DSPLL pulls to the new frequency using its loop bandwidth or Fastlock mode, asserting LOL during acquisition but avoiding output phase discontinuity.