Skyworks Solutions Inc. SI5342A-B05654-GM

Overview

SI5342A-B05654-GM 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 1028 MHz (differential) or 250 MHz (LVCMOS) for SyncE-compliant timing in carrier-grade networking line cards.

For engineers reviewing the SI5342A-B05654-GM datasheet, SI5342A-B05654-GM pinout, SI5342A-B05654-GM application, or SI5342A-B05654-GM equivalent, this device is selected for high-stability, hitless input switching in OTN transponders, 10/40/100G line cards, and ITU-T G.8262-compliant Synchronous Ethernet systems requiring sub-100-fs jitter performance and factory-programmed configuration.

Technical Context

The SI5342A-B05654-GM implements a digitally controlled DSPLL with fully integrated loop filter and programmable jitter attenuation bandwidth (0.1 Hz–4 kHz), enabling precise optimization of phase noise suppression for specific network timing requirements. Its MultiSynth output dividers support both integer and fractional synthesis, allowing any-output-frequency generation from any-input-frequency while maintaining hitless switching between fractionally related clocks.

It operates across freerun, locked, holdover, and zero-delay modes, with automatic/manual input selection, status monitoring (LOS/OOF/LOL), and glitchless on-the-fly frequency changes. 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 compatibility.

Key Specifications

Pinout & Package

The SI5342A-B05654-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 Si5342 Rev D datasheet Section 9 (Pin Descriptions).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar jitter-attenuating clock multiplier applications.

Compared with SI5342A-B05654-GM, Si5342B-D-GM trades fractional flexibility for simpler configuration and lower cost, while Si5344A-D-GM extends functionality with two more outputs at no package or thermal penalty-making it ideal for scalable timing architectures where future expansion is anticipated.

Availability

SI5342A-B05654-GM is available at Aetrix Electronics and suitable for OTN transponders, Carrier Ethernet switches, and broadcast video infrastructure requiring stable component supply, long-term lifecycle assurance, and factory-programmed repeatability.

Supply support for SI5342A-B05654-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 communications, automotive, and industrial markets.

The SI5342A-B05654-GM belongs to Skyworks' Si534x family of jitter-attenuating clock multipliers, designed specifically for carrier-class synchronization in next-generation optical transport and packet networks demanding G.8262 compliance and sub-100-fs jitter.

FAQ

What is the primary function of the SI5342A-B05654-GM in a telecom timing architecture?

The SI5342A-B05654-GM serves as a jitter-attenuating clock multiplier that cleans and regenerates high-stability timing signals for synchronization-critical subsystems. It accepts noisy or wandering input clocks (e.g., from packet networks), suppresses jitter via its DSPLL, and delivers ultra-low-jitter outputs (90 fs rms) to SerDes, PHYs, and switch fabrics. Its factory-programmed NVM ensures repeatable power-up behavior in carrier-grade equipment where deterministic timing initialization is mandatory.

Does the SI5342A-B05654-GM support both I²C and SPI interfaces for configuration?

Yes, the SI5342A-B05654-GM supports both I²C and SPI serial interfaces for register access and NVM programming. I²C (SCL/SDA pins) is the default and most commonly used interface, offering simple two-wire control. SPI mode is enabled via strap pin configuration and provides faster write speeds for high-volume production programming. Both interfaces allow full read/write access to all configuration registers, status flags, and NVM storage - essential for field updates and diagnostics in deployed SI5342A-B05654-GM systems.

How does the SI5342A-B05654-GM handle loss of input clock signal?

Upon loss of a valid input clock, the SI5342A-B05654-GM automatically enters holdover mode using averaged historical frequency data stored during prior lock. It calculates a final holdover frequency from a programmable window (up to 120 seconds) of prior input measurements, minimizing phase disturbance. Output stability then depends on the external 25–54 MHz crystal connected to XA/XB. The device asserts the INTRb pin and sets status bits (LOL, OOF) to signal the event, enabling host MCU or FPGA to initiate failover or alarm reporting - a key requirement for ITU-T G.8262-compliant systems.

Can the SI5342A-B05654-GM generate different output formats simultaneously?

Yes, the SI5342A-B05654-GM supports independent output formatting: OUT0 and OUT1 can each be configured for LVDS, LVPECL, LVCMOS, CML, or HCSL with programmable amplitude, common-mode voltage, and polarity. For example, one output may drive a 156.25 MHz LVPECL SerDes while the other supplies 25 MHz LVCMOS to an FPGA management controller - all from the same SI5342A-B05654-GM device. This eliminates need for external level translators or discrete clock buffers in multi-voltage timing domains.

Is the SI5342A-B05654-GM pin-compatible with other Si534x family members?

No, the SI5342A-B05654-GM is not pin-compatible with Si5344 or Si5345 variants due to differing pin counts (44-QFN vs. 64-QFN) and functional allocation. However, it shares the same 44-QFN 7×7 mm package footprint and pinout as other Si5342 variants (e.g., Si5342B-D-GM), enabling drop-in replacement within the Si5342 subfamily when specifications align. Always verify pin mapping and register compatibility using Skyworks' official Si5342 Rev D datasheet before substitution.