Skyworks Solutions Inc. SI5344B-B05714-GM

Overview

SI5344B-B05714-GM from Skyworks is a 4-input, 4-output jitter-attenuating clock multiplier with DSPLL™ and MultiSynth™ architecture, delivering 90 fs rms jitter, programmable jitter attenuation bandwidth (0.1 Hz–4 kHz), and support for LVDS/LVPECL/LVCMOS/CML/HCSL outputs. It operates across –40 to +85 °C and meets ITU-T G.8262 EEC Option 1 & 2 for Synchronous Ethernet applications in carrier-grade line cards.

For engineers reviewing the SI5344B-B05714-GM datasheet, SI5344B-B05714-GM pinout, SI5344B-B05714-GM application, or SI5344B-B05714-GM equivalent, this device is selected for high-stability timing in OTN transponders, 10/40/100G networking line cards, and SyncE-compliant switches where ultra-low jitter, hitless input switching, and holdover mode stability are critical design requirements.

Technical Context

The SI5344B-B05714-GM implements a fourth-generation DSPLL with fully integrated loop filter and digitally programmable loop bandwidth (0.1 Hz–4 kHz), enabling precise jitter filtering without external components. Its MultiSynth architecture supports fractional-N synthesis on all four outputs, allowing independent generation of any frequency between 100 Hz and 350 MHz from differential (8 kHz–750 MHz) or LVCMOS (8 kHz–250 MHz) inputs.

It features automatic/manual input clock selection with hitless, ramped, and glitchless switching modes, status monitoring (LOS/OOF/LOL), and in-circuit programmable OTP memory. The device uses an external 25–54 MHz crystal for free-run and holdover reference, with core supply at 1.8 V ±5% (VDD) and analog supply at 3.3 V ±5% (VDDA).

Key Specifications

Pinout & Package

SI5344B-B05714-GM 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 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 SI5344B-B05714-GM, the Si5344A variant offers broader frequency coverage but identical pinout and feature set, while the LMK04832 provides higher-frequency capability and integrated power management at the cost of increased board area and power consumption.

Availability

SI5344B-B05714-GM is available at Aetrix Electronics and suitable for OTN transponders, Synchronous Ethernet switches, and broadcast video infrastructure requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for SI5344B-B05714-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, automotive, and industrial markets.

The Si5344 family is designed specifically for high-performance timing in telecom and datacom infrastructure, delivering jitter attenuation, flexible clock synthesis, and robust holdover operation for mission-critical network equipment.

FAQ

What is the maximum output frequency supported by SI5344B-B05714-GM?

The SI5344B-B05714-GM supports a maximum output frequency of 350 MHz, as defined in Skyworks' Si5345/44/42 Rev D Ordering Guide for the "B" variant. This limit applies to all four outputs and is lower than the 1028 MHz capability of the "A" variant, reflecting its optimized use case for sub-350 MHz telecom and enterprise clocking applications such as 10G/40G Ethernet and SyncE line cards. SI5344B-B05714-GM maintains full feature parity-including jitter attenuation, hitless switching, and holdover-within this frequency range.

Does SI5344B-B05714-GM require external loop filter components?

No, SI5344B-B05714-GM integrates the entire DSPLL loop filter on-die, eliminating discrete capacitors and resistors. This reduces PCB area, avoids noise coupling from external components, and guarantees consistent loop response across temperature and voltage. The loop bandwidth remains digitally programmable from 0.1 Hz to 4 kHz without hardware changes. SI5344B-B05714-GM's monolithic filter design is validated in Skyworks' Rev D datasheet Section 3.2 and enables drop-in replacement of legacy discrete-filter jitter cleaners.

How does SI5344B-B05714-GM handle loss of input clock?

Upon input clock failure, SI5344B-B05714-GM automatically enters holdover mode using up to 120 seconds of stored historical frequency data to compute a stable averaged holdover frequency. The holdover window size and delay are programmable to exclude corrupted data near failure time. Output frequency drift during holdover depends solely on the 25–54 MHz crystal connected to XA/XB. SI5344B-B05714-GM exits holdover glitchlessly when a valid input returns, optionally ramping the output frequency to minimize phase disturbance.

Can SI5344B-B05714-GM generate different output frequencies simultaneously?

Yes, SI5344B-B05714-GM supports independent frequency generation on all four outputs using its MultiSynth architecture. Each output can be programmed to any frequency from 100 Hz to 350 MHz-e.g., OUT0 = 156.25 MHz (Ethernet), OUT1 = 250 MHz (FPGA), OUT2 = 125 MHz (PHY), OUT3 = 100 MHz (control logic)-with no shared dividers or constraints. Frequency plans are configured via I²C/SPI and stored in on-chip OTP memory, ensuring deterministic power-up behavior. SI5344B-B05714-GM's crosspoint switch enables full routing flexibility between MultiSynth engines and outputs.

Is SI5344B-B05714-GM compliant with ITU-T G.8262?

Yes, SI5344B-B05714-GM meets ITU-T G.8262 EEC Option 1 and Option 2 specifications for Synchronous Ethernet equipment clocks. Its 90 fs rms jitter, programmable jitter attenuation bandwidth (0.1 Hz–4 kHz), and holdover stability-when paired with a suitable crystal or TCXO on XA/XB-enable compliance in both access and aggregation node deployments. Validation is documented in Skyworks' Si5345/44/42 Rev D datasheet Section 1 (Features List) and supported by ClockBuilder Pro timing margin reports for SI5344B-B05714-GM configurations.