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Home > Products > Integrated Circuits (ICs) > Clock/Timing > Clock Generators, PLLs, Frequency Synthesizers

Skyworks Solutions Inc. SI5342A-A-GMR

Name: SI5342A-A-GMR
Brand: Skyworks Solutions Inc.
SKU: SI5342A-A-GMR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI5342A-A-GMR

Manufacturer:: Skyworks Solutions Inc.

Category:: Clock Generators, PLLs, Frequency Synthesizers

Package:: 44-VFQFN Exposed Pad

Datasheet:: SI5342A-A-GMR.pdf

Description:: IC CLK BUFFER PLL 44QFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SI5342A-A-GMR from Skyworks is a 4-input, 2-output jitter attenuator/clock multiplier featuring fourth-generation DSPLL™ and MultiSynth™ technology. It delivers ultra-low 90 fs rms jitter, supports differential (8 kHz–750 MHz) and LVCMOS (8 kHz–250 MHz) inputs, and generates any-frequency outputs up to 1028 MHz (differential) or 250 MHz (LVCMOS), meeting ITU-T G.8262 EEC Option 1/2 for Synchronous Ethernet in carrier-grade networking line cards.

For engineers reviewing the SI5342A-A-GMR datasheet, SI5342A-A-GMR pinout, SI5342A-A-GMR application, or SI5342A-A-GMR equivalent, key selection considerations include its 2-output 44-QFN 7×7 mm package, programmable jitter attenuation bandwidth (0.1 Hz–4 kHz), hitless/DCO/ramped switching modes, and support for LVDS/LVPECL/LVCMOS/CML/HCSL output formats with independent supply voltage per output.

Technical Context

The SI5342A-A-GMR implements a digitally controlled DSPLL architecture with fractional input dividers (P), high-performance MultiSynth output dividers (N), and integer output division (R), enabling any-frequency synthesis from any input frequency. Its fully integrated loop filter eliminates external components, while digital bandwidth control ensures stable operation across 0.1 Hz–4 kHz without peaking.

It operates in freerun, locked, holdover, and zero-delay modes, with automatic/manual input clock switching, status monitoring (LOS/OOF/LOL), and glitchless on-the-fly output frequency changes. The device uses an internal oscillator with 25–54 MHz crystal reference and supports DCO mode with 0.001 ppb step size for fine frequency tuning.

Key Specifications

Parameter	Value and Actual Design Meaning
Output count	2 independent, configurable clock outputs
Jitter (rms)	90 fs - meets stringent SyncE EEC Option 1/2 requirements
Input range	Differential: 8 kHz–750 MHz; LVCMOS: 8 kHz–250 MHz - supports telecom and datacom timing sources
Output range	Differential: 100 Hz–1028 MHz; LVCMOS: 100 Hz–250 MHz - covers SONET/SDH, Ethernet, and broadcast video rates
Jitter BW	0.1 Hz–4 kHz programmable - enables application-specific noise filtering
Crystal ref.	25–54 MHz external XTAL - integrated loading capacitors reduce BOM and noise coupling
Supply voltages	VDD = 1.8 V ±5%; VDDA = 3.3 V ±5%; independent output supplies (1.8/2.5/3.3 V) - simplifies mixed-voltage system integration

Pinout & Package

The SI5342A-A-GMR is housed in a 44-pin QFN package measuring 7×7 mm with 0.5 mm pitch and exposed thermal pad. Pin functions are validated per Skyworks Si5342 Rev D datasheet Section 9 (Pin Descriptions).

Pin/Terminal	Circuit Role	Design Meaning
IN0–IN3	Input clock terminals	Four selectable differential/LVCMOS inputs; IN3 serves as FB_IN in zero-delay mode
OUT0, OUT1	Output clock terminals	Two fully configurable outputs supporting LVDS/LVPECL/LVCMOS/CML/HCSL with programmable amplitude and common-mode voltage
XA/XB	Crytal oscillator interface	Connects to 25–54 MHz fundamental-mode crystal; internal load caps eliminate external components
IN_SEL[1:0]	Manual input select control	2-bit pin-selectable input source (IN0–IN2); IN3 reserved in zero-delay mode
RSTb	Hardware reset input	Active-low asynchronous reset; triggers full NVM reload and initialization
INTRb	Interrupt output	Open-drain status flag indicating LOS/OOF/LOL events for real-time fault monitoring

Key Features

Feature	Design Value
Any-frequency synthesis	Generates arbitrary output frequencies from any input frequency using fractional P/N/R dividers - eliminates need for multiple fixed-ratio PLLs
Hitless input switching	Prevents phase transients when switching between fractionally related clocks - critical for seamless network synchronization
Programmable jitter BW	Digital selection of 0.1 Hz–4 kHz attenuation bandwidth - optimizes trade-off between jitter cleanup and wander suppression
DCO mode	0.001 ppb frequency step resolution via FINC/FDEC pins or serial interface - enables precise frequency calibration in test equipment
Holdover history	Stores 120 s of locked-frequency history with programmable averaging window - minimizes phase disturbance during input failure

Applications

Broadcast Video Timing	Carrier Ethernet Switching
Use Scenario: Genlock and frame-synchronized clock distribution across SDI routers, converters, and IP-based media gateways. IC Role / Device Role / Timing Role: Jitter-attenuated master clock generator providing low-phase-noise 27 MHz, 74.25 MHz, and 148.5 MHz reference clocks. Use Value: 90 fs rms jitter ensures compliance with SMPTE ST 2059-2 PTP timing accuracy and prevents video frame slips or lip-sync errors.	Use Scenario: Synchronous Ethernet (SyncE) timing recovery on 10/40/100 GbE line cards in metro and core routers. IC Role / Device Role / Timing Role: G.8262-compliant jitter attenuator locking to primary reference clocks (PRC) or enhanced primary reference clocks (ePRC). Use Value: Meets EEC Option 1/2 wander and jitter limits, enabling interoperability across multi-vendor carrier networks without timing loops.
OTN Muxponder Timing	Test & Measurement Instrumentation
Use Scenario: Clock regeneration and jitter cleanup for OTU1/OTU2/OTU3/OTU4 framers in optical transport network edge devices. IC Role / Device Role / Timing Role: Dual-output jitter attenuator generating clean 155.52 MHz, 622.08 MHz, and 2.488 GHz clocks from recovered line timing. Use Value: Sub-100 fs jitter preserves BER margin in coherent modulation schemes and satisfies ITU-T G.709 OTN jitter tolerance masks.	Use Scenario: Precision frequency synthesis and agile clock generation in bit error rate testers (BERTs), signal analyzers, and arbitrary waveform generators. IC Role / Device Role / Timing Role: Programmable DCO-based clock source with sub-ppt frequency resolution and glitchless reconfiguration. Use Value: 0.001 ppb DCO step size and ramped holdover exit enable traceable calibration and dynamic sweep testing without cycle slips.

Broadcast Video Timing

Carrier Ethernet Switching

Use Scenario: Genlock and frame-synchronized clock distribution across SDI routers, converters, and IP-based media gateways.

IC Role / Device Role / Timing Role: Jitter-attenuated master clock generator providing low-phase-noise 27 MHz, 74.25 MHz, and 148.5 MHz reference clocks.

Use Value: 90 fs rms jitter ensures compliance with SMPTE ST 2059-2 PTP timing accuracy and prevents video frame slips or lip-sync errors.

Use Scenario: Synchronous Ethernet (SyncE) timing recovery on 10/40/100 GbE line cards in metro and core routers.

IC Role / Device Role / Timing Role: G.8262-compliant jitter attenuator locking to primary reference clocks (PRC) or enhanced primary reference clocks (ePRC).

Use Value: Meets EEC Option 1/2 wander and jitter limits, enabling interoperability across multi-vendor carrier networks without timing loops.

OTN Muxponder Timing

Test & Measurement Instrumentation

Use Scenario: Clock regeneration and jitter cleanup for OTU1/OTU2/OTU3/OTU4 framers in optical transport network edge devices.

IC Role / Device Role / Timing Role: Dual-output jitter attenuator generating clean 155.52 MHz, 622.08 MHz, and 2.488 GHz clocks from recovered line timing.

Use Value: Sub-100 fs jitter preserves BER margin in coherent modulation schemes and satisfies ITU-T G.709 OTN jitter tolerance masks.

Use Scenario: Precision frequency synthesis and agile clock generation in bit error rate testers (BERTs), signal analyzers, and arbitrary waveform generators.

IC Role / Device Role / Timing Role: Programmable DCO-based clock source with sub-ppt frequency resolution and glitchless reconfiguration.

Use Value: 0.001 ppb DCO step size and ramped holdover exit enable traceable calibration and dynamic sweep testing without cycle slips.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Si5342B-A-GMR	Same 4-in/2-out architecture but limited to 350 MHz max output frequency and integer-only synthesis	Suitable for legacy SONET/SDH (155/622 MHz) but not 10G/100G Ethernet or OTU4 (2.488 GHz)	Select when cost-sensitive designs require only sub-350 MHz outputs and do not need fractional synthesis
LTC6957-2	Analog Devices 2-output jitter cleaner with 220 fs rms jitter, no NVM, and fixed 100 kHz–2.2 GHz output range	Lacks DCO mode, holdover, and automatic input switching; requires external loop filter	Choose for simpler, lower-jitter-cleanup applications where programmability and robust failover are not required

Compared with Si5342B-A-GMR, the SI5342A-A-GMR supports higher-frequency outputs (up to 1028 MHz) and fractional synthesis for greater flexibility; versus LTC6957-2, it provides integrated NVM, digital bandwidth control, and comprehensive fault monitoring - essential for carrier-class reliability.

Availability

SI5342A-A-GMR is available at Aetrix Electronics and suitable for carrier Ethernet switches, OTN muxponders, broadcast video infrastructure, and test equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for SI5342A-A-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, industrial, and automotive markets.

The SI5342A-A-GMR belongs to Skyworks' Si534x family of jitter-attenuating clock multipliers, designed specifically for high-reliability telecom infrastructure requiring ITU-T G.8262 compliance, hitless switching, and holdover resilience.

FAQ

What is the maximum output frequency supported by the SI5342A-A-GMR?

The SI5342A-A-GMR supports differential output frequencies up to 1028 MHz and LVCMOS outputs up to 250 MHz. This capability enables direct clocking of 100G Ethernet PHYs, OTU4 framers, and high-speed ADCs without additional frequency multiplication stages. The 1028 MHz limit is confirmed in the Si5342 Rev D datasheet Table 2.1 and applies specifically to the SI5342A variant with integer-and-fractional synthesis mode.

Does the SI5342A-A-GMR require an external crystal, and what frequency range is supported?

Yes, the SI5342A-A-GMR requires an external crystal connected to XA/XB pins, supporting 25–54 MHz fundamental-mode crystals. Internal loading capacitors eliminate the need for external C-L components, reducing board area and noise susceptibility. A 48–54 MHz crystal is recommended for optimal jitter performance, as stated in Section 3.5 of the Rev D datasheet.

How does the SI5342A-A-GMR handle input clock failures in carrier-grade systems?

The SI5342A-A-GMR enters holdover mode upon input failure, using up to 120 seconds of stored frequency history to compute an averaged holdover frequency. Its programmable holdover window and ramped exit minimize phase disturbance, ensuring continuous SyncE compliance during network outages. This behavior is defined in Section 3.4.5 and validated for ITU-T G.8262 EEC Option 1/2.

Can the SI5342A-A-GMR generate different output formats simultaneously, such as LVDS and LVCMOS?

Yes, the SI5342A-A-GMR supports independent configuration of each output for LVDS, LVPECL, LVCMOS, CML, or HCSL with programmable amplitude and common-mode voltage. OUT0 and OUT1 can operate in different formats concurrently, enabling mixed-interface timing distribution in systems like packet-optical transport platforms with both ASIC and FPGA clock domains.

Is factory preprogramming available for the SI5342A-A-GMR, and how is it ordered?

Yes, factory preprogrammed SI5342A-A-GMR devices are available through Skyworks' ClockBuilder Pro software. Custom part numbers follow the format "Si5342A-Dxxxxx-GM", where "xxxxx" is a unique numerical configuration ID assigned by Skyworks. Preprogrammed units power up with user-defined frequencies and settings, eliminating field programming overhead in high-volume manufacturing.

SI5342A-A-GMR Specifications

Product attributes: Attribute value

Manufacturer:: Skyworks Solutions Inc.

Series:: -

Package/Case:: 44-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

Programmable:: Not Verified

Type:: -

PLL:: Yes

Input:: LVCMOS, LVDS, LVPECL, Crystal

Output:: CML, HCSL, LVCMOS, LVDS, LVPECL

Number of Circuits:: 1

Ratio - Input:Output:: 5:2

Differential - Input:Output:: Yes/Yes

Frequency - Max:: 712.5MHz

Divider/Multiplier:: Yes/No

Voltage - Supply:: 1.71V ~ 3.47V

Operating Temperature:: -40°C ~ 85°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 44-QFN (7x7)

SI5342A-A-GMR FAQ

1.How can I place an order for SI5342A-A-GMR through Aetrix?

Please submit a Request for Quotation (RFQ) for SI5342A-A-GMR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SI5342A-A-GMR reliable?

The price and inventory of SI5342A-A-GMR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI5342A-A-GMR is usually 5 days.

3.What payment methods are accepted for SI5342A-A-GMR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI5342A-A-GMR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI5342A-A-GMR?

SI5342A-A-GMR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI5342A-A-GMR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SI5342A-A-GMR?

For technical support, including SI5342A-A-GMR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI5342A-A-GMR requirements.

6.How does Aetrix verify that SI5342A-A-GMR is sourced from the original manufacturer or authorized distributors?

All SI5342A-A-GMR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SI5342A-A-GMR meets industry standards.

7.What is the process for return or replacement of SI5342A-A-GMR?

All SI5342A-A-GMR units undergo pre-shipment inspection (PSI). If there is an issue with SI5342A-A-GMR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SI5342A-A-GMR part is unused and in its original packaging.

Return procedure for SI5342A-A-GMR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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