Skyworks Solutions Inc. SI5344A-B03541-GMR

Overview

SI5344A-B03541-GMR from Skyworks is a 4-input, 4-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 line cards and OTN transponders.

For engineers reviewing the SI5344A-B03541-GMR datasheet, SI5344A-B03541-GMR pinout, SI5344A-B03541-GMR application, or SI5344A-B03541-GMR equivalent, key selection considerations include its G.8262 EEC Option 1/2 compliance, digitally programmable jitter attenuation bandwidth (0.1 Hz–4 kHz), hitless input switching capability, and factory-programmed configuration stored in on-chip NVM.

Technical Context

The SI5344A-B03541-GMR implements a fourth-generation DSPLL with integrated loop filter and digitally configurable loop bandwidth (0.1 Hz–4 kHz), enabling precise jitter filtering without external components. Its MultiSynth output dividers support both integer and fractional synthesis, allowing any-output-frequency generation from any-input-frequency.

It operates across freerun, locked, holdover, and zero-delay modes, with automatic/manual input clock switching, status monitoring (LOS/OOF/LOL), and glitchless on-the-fly frequency changes. The device uses an internal oscillator driven by a 25–54 MHz crystal for stable free-run/holdover reference.

Key Specifications

Pinout & Package

The SI5344A-B03541-GMR 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 Si5344 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 SI5344A-B03541-GMR, Si5344A-D-GM1 offers identical performance but requires field programming, while LMK04832ISQE/NOPB trades 20 fs higher jitter for JESD204B support and deterministic latency-making it better suited for data converter timing rather than SyncE infrastructure.

Availability

SI5344A-B03541-GMR is available at Aetrix Electronics and suitable for OTN transponders, SyncE line cards, broadcast video equipment, and test instrumentation requiring stable component supply, long-term lifecycle assurance, and guaranteed factory-programmed configuration.

Supply support for SI5344A-B03541-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, automotive, and industrial markets.

The Si5344 family is designed specifically for high-performance jitter attenuation and any-frequency clock multiplication in carrier-grade timing applications, with emphasis on SyncE, OTN, and broadcast video standards compliance.

FAQ

What is the factory-programmed configuration of SI5344A-B03541-GMR?

The SI5344A-B03541-GMR is preconfigured by Skyworks with a specific frequency plan stored in one-time-programmable (OTP) NVM. This eliminates the need for external configuration during power-up and ensures immediate, repeatable operation. The exact output frequencies, input selections, and loop bandwidth settings are defined in the ClockBuilder Pro project associated with B03541. SI5344A-B03541-GMR retains this configuration across power cycles without host intervention.

Does SI5344A-B03541-GMR support gapped clock inputs?

Yes, SI5344A-B03541-GMR supports locking to gapped input clocks-a critical feature for OTN applications where reference signals may have missing periods due to framing overhead. Its DSPLL architecture tolerates high input jitter and maintains stable output phase continuity during gapped operation. This capability is enabled by default and does not require special register configuration beyond standard lock acquisition setup.

What crystal frequency is recommended for optimal jitter performance with SI5344A-B03541-GMR?

Skyworks recommends a 48–54 MHz fundamental-mode crystal for SI5344A-B03541-GMR to achieve best-in-class 90 fs RMS jitter. Crystals in this range minimize phase noise contribution from the oscillator circuit. The SI5344A-B03541-GMR integrates internal load capacitors, eliminating external CL components. Operation outside this range (e.g., 25–47.999 MHz) is supported but results in measurable jitter degradation per datasheet Figure 8.10.

Can SI5344A-B03541-GMR operate in zero-delay mode?

Yes, SI5344A-B03541-GMR supports zero-delay mode, where IN3 functions as the feedback input (FB_IN) instead of a clock input. In this mode, the device aligns output phase to the FB_IN signal with minimal propagation delay. Zero-delay mode requires specific register configuration and is commonly used in clock distribution networks where deterministic latency and phase alignment are essential. SI5344A-B03541-GMR's configuration supports this mode out-of-box if enabled in its factory-programmed NVM image.

How does SI5344A-B03541-GMR handle input clock failure and recovery?

Upon input clock failure, SI5344A-B03541-GMR automatically enters holdover mode using up to 120 seconds of averaged historical frequency data to maintain output stability. When a valid clock returns, it performs a glitchless reacquisition-optionally ramped-to smoothly transition back to locked mode without phase discontinuity. This behavior is fully implemented in hardware and requires no host software intervention, ensuring robust timing continuity in mission-critical infrastructure.