Skyworks Solutions Inc. SI5342B-B02950-GM

Overview

SI5342B-B02950-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 outputs from 100 Hz to 350 MHz across LVDS/LVPECL/LVCMOS/CML/HCSL formats. It powers SyncE-compliant carrier Ethernet line cards requiring precise holdover stability.

For engineers reviewing the SI5342B-B02950-GM datasheet, SI5342B-B02950-GM pinout, SI5342B-B02950-GM application, or SI5342B-B02950-GM equivalent, key selection criteria include its 350 MHz max output frequency limit (B-grade), programmable jitter attenuation bandwidth (0.1 Hz–4 kHz), G.8262 EEC Option 1/2 compliance, integrated loop filter, and hitless/ramped input switching for telecom timing resilience.

Technical Context

The SI5342B-B02950-GM implements a fourth-generation DSPLL with digitally programmable loop bandwidth (0.1 Hz–4 kHz) for optimized jitter filtering, and dual MultiSynth dividers enabling independent integer/fractional synthesis per output. Its architecture supports free-run, locked, and holdover modes using an internal oscillator driven by a 25–54 MHz crystal reference.

It features automatic/manual input clock selection across four inputs (IN0–IN3), glitchless and hitless switching between plesiochronous or phase-locked sources, and status monitoring (LOS/OOF/LOL) via dedicated flags and INTRb pin - all configured via I²C/SPI with on-chip OTP NVM.

Key Specifications

Pinout & Package

The SI5342B-B02950-GM uses a 44-pin QFN package (7 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are validated 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 SI5342B-B02950-GM, the Si5342C-B02950-GM trades fractional synthesis flexibility for extended frequency reach, while the Si5344B-D-GM provides two additional outputs at identical jitter and bandwidth specs-enabling consolidation in multi-clock systems without compromising holdover stability or SyncE compliance.

Availability

SI5342B-B02950-GM is available at Aetrix Electronics and suitable for carrier Ethernet switches, OTN muxponders, broadcast video infrastructure, and test equipment requiring stable component supply with guaranteed long-term lifecycle support.

Supply support for SI5342B-B02950-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, industrial, and automotive markets.

The SI5342B-B02950-GM belongs to Skyworks' Si534x family of jitter-attenuating clock multipliers, designed specifically for telecom infrastructure demanding G.8262 SyncE compliance, robust holdover, and seamless input switching in mission-critical timing applications.

FAQ

What is the maximum output frequency supported by the SI5342B-B02950-GM?

The SI5342B-B02950-GM is a B-grade variant with a maximum output frequency of 350 MHz. This is specified in Skyworks' Si5345/44/42 Rev D Ordering Guide and distinguishes it from A-grade (1028 MHz) and C/D-grade variants. The 350 MHz limit applies to all output formats (LVDS, LVPECL, LVCMOS, CML, HCSL) and is enforced by internal frequency validation logic in the SI5342B-B02950-GM's firmware and hardware design.

Does the SI5342B-B02950-GM support fractional-N synthesis?

Yes, the SI5342B-B02950-GM supports both integer and fractional-N synthesis via its MultiSynth architecture, as confirmed in the Si5345/44/42 Rev D Data Sheet Feature List and Ordering Guide. This capability enables arbitrary output frequencies (e.g., 122.88 MHz, 156.25 MHz) from non-integer-related inputs, a core requirement for SyncE and OTN applications where exact frequency alignment is mandatory.

How does the SI5342B-B02950-GM achieve ultra-low 90 fs rms jitter?

The SI5342B-B02950-GM achieves 90 fs rms jitter through fourth-generation DSPLL™ architecture with fully integrated loop filter, optimized VCO design, and advanced noise-reduction techniques in its MultiSynth dividers. Measured per IEEE 1149.1 and ITU-T G.8262 Annex A, this performance is sustained across temperature (–40°C to +85°C) and supply variation, and is validated in Skyworks' characterization reports for the SI5342B-B02950-GM under typical 12 kHz–20 MHz integration bandwidth.

Can the SI5342B-B02950-GM operate without an external crystal?

No - the SI5342B-B02950-GM requires an external 25–54 MHz crystal connected to XA/XB pins for free-run and holdover mode operation. While it accepts an external REFCLK instead of a crystal, the datasheet specifies that optimal jitter performance (including the rated 90 fs rms) is achieved only with a crystal; REFCLK mode increases jitter and disables internal load capacitors. The SI5342B-B02950-GM has no internal oscillator capable of standalone operation.

Is the SI5342B-B02950-GM pin-compatible with other Si534x devices?

Yes - the SI5342B-B02950-GM shares the same 44-QFN 7×7 mm package and pinout with Si5342A/C/D and Si5344A/B/C/D variants, as documented in Section 10.2 of the Si5345/44/42 Rev D Data Sheet. This allows direct PCB footprint reuse across the Si5342/Si5344 families, though register configurations and NVM contents must be updated to match the specific variant's capabilities and frequency limits.