Skyworks Solutions Inc. SI5342D-A-GM

Overview

SI5342D-A-GM 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 350 MHz in LVDS/LVPECL/LVCMOS/CML/HCSL formats - deployed in carrier-grade SyncE line cards and OTN transponders.

For engineers reviewing the SI5342D-A-GM datasheet, SI5342D-A-GM pinout, SI5342D-A-GM application, or SI5342D-A-GM equivalent, key selection criteria include G.8262 EEC Option 1/2 compliance, digitally programmable jitter attenuation bandwidth (0.1 Hz–4 kHz), hitless/ramped/glitchless input switching, DCO mode with 0.001 ppb step size, and factory-programmable NVM configuration for deterministic power-up behavior.

Technical Context

The SI5342D-A-GM integrates a fully on-chip DSPLL loop filter and uses fractional input dividers (P) plus MultiSynth output dividers (N/R) to enable any-frequency synthesis from any input frequency. Its architecture supports free-run, locked, holdover, and zero-delay modes with automatic/manual input clock selection and status monitoring (LOS/OOF/LOL).

It implements three distinct switching mechanisms: hitless switching for phase-coherent inputs, ramped switching for plesiochronous inputs (±500 ppm), and glitchless pull-in using Fastlock bandwidth (100 Hz–4 kHz). The device uses an external 25–54 MHz crystal (XA/XB) for reference stability and features independent output supply pins (1.8 V/2.5 V/3.3 V) for mixed-signal interface flexibility.

Key Specifications

Pinout & Package

The SI5342D-A-GM is housed in a 44-pin QFN package (7 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined per Skyworks' official pinout documentation for Si5342 Rev D.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SI5342C-A-GM, the SI5342D-A-GM adds fractional synthesis for flexible frequency planning and gapped-clock support; versus LMK04832RHAR, it offers lower jitter (90 fs vs. 110 fs), smaller footprint, and native SyncE compliance - making it optimal for space-constrained telecom timing nodes.

Availability

SI5342D-A-GM is available at Aetrix Electronics and suitable for OTN transponders, SyncE line cards, broadcast video infrastructure, and test & measurement equipment requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for SI5342D-A-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, and infrastructure markets.

The SI5342D-A-GM belongs to Skyworks' Si534x family of jitter-attenuating clock multipliers, designed specifically for carrier-class timing applications demanding G.8262 compliance, ultra-low jitter, and robust holdover performance in telecom and datacom systems.

FAQ

What is the maximum output frequency supported by the SI5342D-A-GM?

The SI5342D-A-GM supports differential output frequencies up to 350 MHz and LVCMOS outputs up to 250 MHz. This limit is defined by its "D" variant designation in the Si5342 family ordering guide and is optimized for SyncE and OTN applications where jitter performance degrades above this range. The device maintains 90 fs RMS jitter across its full specified output band.

Does the SI5342D-A-GM support G.8262 EEC Option 1 and Option 2 compliance?

Yes, the SI5342D-A-GM meets both ITU-T G.8262 EEC Option 1 and Option 2 requirements as verified in Skyworks' official datasheet Rev 1.2. It achieves this through its digitally programmable DSPLL loop bandwidth (0.1 Hz–4 kHz), integrated holdover algorithm, and ultra-low 90 fs RMS jitter - enabling deployment as a T-BC or T-TSC in Carrier Ethernet networks.

How does the SI5342D-A-GM handle input clock failure and recovery?

Upon input failure, the SI5342D-A-GM automatically enters holdover mode using a 120-second history of locked frequency data to compute an averaged holdover frequency. During recovery, it performs glitchless pull-in using either the DSPLL or Fastlock bandwidth. Ramped exit (configurable 0.2–40,000 ppm/s) avoids phase transients - all behavior is implemented within the SI5342D-A-GM's on-die state machine without external intervention.

Can the SI5342D-A-GM generate clocks from a gapped input signal?

Yes, the SI5342D-A-GM supports locking to gapped clock inputs - a feature explicitly documented in Section 3.7.7 of the Si5345/44/42 Rev D datasheet. Its DSPLL architecture tolerates missing cycles and reconstructs a clean, continuous output clock at the average input frequency, making it suitable for modulated reference scenarios in broadcast and test equipment.

What interfaces are supported for configuring the SI5342D-A-GM?

The SI5342D-A-GM supports both I²C (SCL/SDA) and SPI serial interfaces for register access, status monitoring, and NVM programming. Configuration is simplified using Skyworks' ClockBuilder Pro™ software, which generates validated configuration files. Factory preprogrammed units (e.g., Si5342D-A-Dxxxxx-GM) are also available for turnkey deployment without field programming.