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

Skyworks Solutions Inc. SI5342C-A-GM

Name: SI5342C-A-GM
Brand: Skyworks Solutions Inc.
SKU: SI5342C-A-GM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI5342C-A-GM

Manufacturer:: Skyworks Solutions Inc.

Category:: Clock Generators, PLLs, Frequency Synthesizers

Package:: 44-VFQFN Exposed Pad

Datasheet:: SI5342C-A-GM.pdf

Description:: IC CLK BUFFER PLL 44QFN

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Product details

Overview

SI5342C-A-GM from Skyworks is a 4-input, 2-output, integer-only jitter attenuator/clock multiplier using fourth-generation DSPLL™ and MultiSynth™ technology. It delivers ultra-low 90 fs rms jitter, supports differential inputs up to 750 MHz and LVCMOS inputs up to 250 MHz, and generates outputs from 100 Hz to 1028 MHz (differential) or 250 MHz (LVCMOS), targeting SyncE-compliant carrier Ethernet line cards.

For engineers reviewing the SI5342C-A-GM datasheet, SI5342C-A-GM pinout, SI5342C-A-GM application, or SI5342C-A-GM equivalent, key selection considerations include its integer-only synthesis mode, 44-QFN 7×7 mm package, G.8262 EEC Option 1/2 compliance, programmable jitter attenuation bandwidth (0.1 Hz–4 kHz), and support for hitless/ramped/glitchless input switching in telecom timing systems.

Technical Context

The SI5342C-A-GM implements a digitally controlled DSPLL with fully integrated loop filter and programmable loop bandwidth (0.1 Hz–4 kHz), enabling precise jitter filtering and holdover stability. Its MultiSynth architecture uses integer-only frequency division (N) and integer output division (R), with no fractional synthesis-confirmed by the "Integer Only" designation in the Ordering Guide for Si5342C-D-GM variants.

It operates across freerun, locked, holdover, and zero-delay modes, supports automatic/manual input clock switching across four inputs (IN0–IN3), and provides status monitoring (LOS/OOF/LOL) via dedicated pins and register flags. Core supply is 1.8 V ±5% (VDD), analog supply is 3.3 V ±5% (VDDA), and output supplies are independently configurable at 3.3 V, 2.5 V, or 1.8 V.

Key Specifications

Parameter	Value and Actual Design Meaning
Jitter (rms)	90 fs rms - meets stringent ITU-T G.8262 EEC Option 1/2 requirements for Synchronous Ethernet applications.
Input range (diff)	8 kHz–750 MHz - accepts common telecom reference clocks including SONET/SDH and OTN line rates.
Output range (diff)	100 Hz–1028 MHz - covers 10G/100G Ethernet, CPRI, and broadcast video timing needs without external dividers.
Jitter BW	0.1 Hz–4 kHz - digitally programmable attenuation bandwidth allows optimization for wander vs. jitter trade-offs in SyncE.
Synthesis mode	Integer Only - eliminates fractional spurs and simplifies configuration for deterministic phase alignment in fixed-frequency systems.
Supply voltages	VDD = 1.8 V ±5%, VDDA = 3.3 V ±5% - enables low-power operation while maintaining high analog performance for jitter-sensitive PLL core.
Temp range	–40 °C to +85 °C - qualified for industrial and telecom infrastructure environments including outdoor baseband units.

Pinout & Package

The SI5342C-A-GM is housed in a 44-pin QFN package measuring 7 mm × 7 mm with 0.5 mm pitch and exposed thermal pad. Pin functions are defined per Skyworks' official Si5342 pinout documentation (Rev D, Section 9).

Pin/Terminal	Circuit Role	Design Meaning
IN0–IN3	Differential/LVCMOS input clocks	Four selectable reference inputs; IN3 serves as FB_IN in zero-delay mode, enabling phase alignment feedback path.
OUT0, OUT1	Differential or LVCMOS clock outputs	Two independently configurable outputs supporting LVDS/LVPECL/LVCMOS/CML/HCSL with programmable amplitude and common-mode voltage.
XA/XB	Crytal oscillator terminals	Connects 25–54 MHz fundamental-mode crystal; internal load caps eliminate external components and reduce noise coupling.
RSTb	Active-low hardware reset	Triggers full initialization and NVM reload; required for deterministic power-up state in carrier-grade systems.
INTRb	Interrupt output	Open-drain flag indicating LOS/OOF/LOL events; enables real-time fault monitoring without polling serial interface.
SCL/SDA or SCLK/SDIO/CSb	I²C or SPI control interface	Configures device registers and NVM; supports in-circuit programming for field updates and custom frequency plans.

Key Features

Feature	Design Value
Hitless input switching	Eliminates phase transients when switching between fractionally related inputs (e.g., 155.52 MHz ↔ 622.08 MHz), preserving packet timing integrity in OTN muxponders.
Programmable holdover window	Stores up to 120 s of historical frequency data and calculates averaged holdover frequency from user-defined time window-minimizing phase jump during reference loss in SyncE networks.
Zero-delay mode	Uses IN3 as feedback input to align OUT0/OUT1 phase with IN0–IN2, enabling deterministic latency for framer-to-phy interfaces in 10G/100G line cards.
Glitchless DCO mode	Supports 0.001 ppb step size frequency tuning via FINC/FDEC pins or register writes-enabling precise wander correction in EEC-compliant systems.
Status monitoring	Dedicated LOS/OOF/LOL detection with interrupt assertion and register flags-provides real-time visibility into reference health for network management systems.

Applications

OTN Muxponder Timing	Carrier Ethernet Switch
Use Scenario: Provides jitter-cleaned, phase-aligned clocks for OTN framing and multiplexing in metro edge nodes where multiple line rates (e.g., 155.52, 622.08, 2488.32 MHz) must coexist. IC Role / Device Role / Timing Role: Jitter attenuator and frequency translator synchronizing client-side and line-side PHYs while meeting ITU-T G.709 and G.8262 requirements. Use Value: 90 fs rms jitter ensures BER <1e−12 in 100G coherent systems; integer-only synthesis avoids fractional spurs that degrade FEC efficiency.	Use Scenario: Generates synchronized 10.3125 GHz and 156.25 MHz clocks for 100GbE MAC/PHY and management subsystems in modular chassis switches. IC Role / Device Role / Timing Role: Dual-output clock multiplier delivering independent, low-jitter references with programmable phase offset for SerDes lane deskew. Use Value: Independent output supplies (1.8 V/3.3 V) allow mixed-voltage SerDes interfacing; ramped holdover exit prevents packet loss during reference switchover.
Broadcast Video Sync	Test & Measurement Instrument
Use Scenario: Supplies genlock-capable 27 MHz, 74.25 MHz, and 148.5 MHz clocks for SDI video processors and frame synchronizers in live production trucks. IC Role / Device Role / Timing Role: Jitter attenuator locking to tri-level sync or black burst reference, then multiplying to SMPTE ST 2082/2081 pixel clock rates. Use Value: Ultra-low 90 fs rms jitter preserves color fidelity and reduces motion artifacts; gapped-clock lock capability handles intermittent sync signals in mobile environments.	Use Scenario: Provides ultra-stable, switchable reference clocks for high-resolution oscilloscopes and bit-error-rate testers requiring sub-100 fs jitter floor. IC Role / Device Role / Timing Role: Programmable jitter attenuator generating calibrated test clocks with traceable phase noise profile and known holdover drift. Use Value: Factory-programmable NVM ensures repeatable startup configuration; DCO mode enables fine-grained jitter injection for receiver sensitivity testing.

OTN Muxponder Timing

Carrier Ethernet Switch

Use Scenario: Provides jitter-cleaned, phase-aligned clocks for OTN framing and multiplexing in metro edge nodes where multiple line rates (e.g., 155.52, 622.08, 2488.32 MHz) must coexist.

IC Role / Device Role / Timing Role: Jitter attenuator and frequency translator synchronizing client-side and line-side PHYs while meeting ITU-T G.709 and G.8262 requirements.

Use Value: 90 fs rms jitter ensures BER <1e−12 in 100G coherent systems; integer-only synthesis avoids fractional spurs that degrade FEC efficiency.

Use Scenario: Generates synchronized 10.3125 GHz and 156.25 MHz clocks for 100GbE MAC/PHY and management subsystems in modular chassis switches.

IC Role / Device Role / Timing Role: Dual-output clock multiplier delivering independent, low-jitter references with programmable phase offset for SerDes lane deskew.

Use Value: Independent output supplies (1.8 V/3.3 V) allow mixed-voltage SerDes interfacing; ramped holdover exit prevents packet loss during reference switchover.

Broadcast Video Sync

Test & Measurement Instrument

Use Scenario: Supplies genlock-capable 27 MHz, 74.25 MHz, and 148.5 MHz clocks for SDI video processors and frame synchronizers in live production trucks.

IC Role / Device Role / Timing Role: Jitter attenuator locking to tri-level sync or black burst reference, then multiplying to SMPTE ST 2082/2081 pixel clock rates.

Use Value: Ultra-low 90 fs rms jitter preserves color fidelity and reduces motion artifacts; gapped-clock lock capability handles intermittent sync signals in mobile environments.

Use Scenario: Provides ultra-stable, switchable reference clocks for high-resolution oscilloscopes and bit-error-rate testers requiring sub-100 fs jitter floor.

IC Role / Device Role / Timing Role: Programmable jitter attenuator generating calibrated test clocks with traceable phase noise profile and known holdover drift.

Use Value: Factory-programmable NVM ensures repeatable startup configuration; DCO mode enables fine-grained jitter injection for receiver sensitivity testing.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Si5342A-D-GM	Supports integer + fractional synthesis; higher flexibility for arbitrary frequencies but introduces fractional spurs.	Preferred for lab equipment or prototyping where frequency agility outweighs spur sensitivity.	Select Si5342A-D-GM only if fractional output generation is required; SI5342C-A-GM is optimal for fixed-frequency SyncE deployments.
LTC6955IUF#PBF	Analog Devices part with 5-output, 3.3 V supply only, 110 fs rms jitter, and no integrated crystal oscillator.	Suitable for mixed-signal test benches needing multi-output fanout but lacking on-chip XTAL support.	Choose LTC6955IUF#PBF when board space allows discrete crystal and higher output count is needed; SI5342C-A-GM integrates XTAL loading and saves BOM cost.

Compared with Si5342A-D-GM, SI5342C-A-GM trades synthesis flexibility for lower spurious emissions and simpler configuration-critical for carrier-grade SyncE. Against LTC6955IUF#PBF, it offers tighter jitter, integrated crystal interface, and industrial temperature rating at the cost of one fewer output.

Availability

SI5342C-A-GM is available at Aetrix Electronics and suitable for carrier Ethernet switches, OTN line cards, broadcast video infrastructure, and test instrumentation requiring stable component supply with long-term lifecycle assurance.

Supply support for SI5342C-A-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 infrastructure, automotive, and industrial markets.

The Si5342 family is designed specifically for high-reliability telecom timing applications demanding ultra-low jitter, robust holdover, and ITU-T G.8262 compliance in compact form factors.

FAQ

What is the primary function of the SI5342C-A-GM in a Synchronous Ethernet system?

The SI5342C-A-GM serves as a jitter attenuator and clock multiplier in Synchronous Ethernet systems, accepting noisy or wandering input references and generating ultra-low-jitter (90 fs rms) output clocks compliant with ITU-T G.8262 EEC Option 1 and 2. It ensures phase and frequency stability across freerun, locked, and holdover modes-critical for preventing packet loss in carrier-grade networks. The SI5342C-A-GM achieves this using its fourth-generation DSPLL architecture with fully integrated loop filter and programmable jitter attenuation bandwidth.

Does the SI5342C-A-GM support fractional frequency synthesis?

No, the SI5342C-A-GM does not support fractional frequency synthesis. As confirmed in Skyworks' Ordering Guide, the "C" suffix denotes "Integer Only" synthesis mode. This means all MultiSynth output divisions use integer-N values only-eliminating fractional spurs and simplifying configuration for fixed-frequency applications like SyncE line cards. For fractional capability, engineers should consider the SI5342A-D-GM variant instead.

What package type and dimensions does the SI5342C-A-GM use?

The SI5342C-A-GM uses a 44-pin QFN package measuring 7 mm × 7 mm with 0.5 mm pitch and an exposed thermal pad. This compact footprint matches the Si5344 and Si5342 variants in the family and is optimized for high-density telecom PCB layouts. The package is RoHS-6 compliant and rated for operation from –40 °C to +85 °C, making it suitable for industrial and outdoor infrastructure deployments.

How does the SI5342C-A-GM handle loss of input reference?

Upon loss of all valid input references, the SI5342C-A-GM automatically enters holdover mode using its internal oscillator and external crystal (25–54 MHz on XA/XB) as the timing source. It calculates a final holdover frequency from up to 120 seconds of stored historical frequency data, with programmable averaging window and delay to reject corrupted pre-failure samples. The SI5342C-A-GM maintains output stability within crystal tolerance (e.g., ±100 ppm) until reference recovery, with glitchless reacquisition using Fastlock or standard DSPLL bandwidth.

Can the SI5342C-A-GM generate both differential and LVCMOS outputs simultaneously?

Yes, the SI5342C-A-GM can generate both differential (e.g., LVDS, LVPECL) and LVCMOS outputs simultaneously. Each of its two outputs (OUT0 and OUT1) is independently configurable for signal format, amplitude, common-mode voltage (for differential), and drive strength. Output supplies are also independent-supporting 3.3 V, 2.5 V, or 1.8 V per output-enabling direct interfacing with mixed-voltage SerDes, FPGAs, and ASICs without level-shifting components. This flexibility is configured via I²C/SPI and stored in non-volatile memory.

SI5342C-A-GM Specifications

Product attributes: Attribute value

Manufacturer:: Skyworks Solutions Inc.

Series:: -

Package/Case:: 44-VFQFN Exposed Pad

Packaging:: Tray

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)

SI5342C-A-GM FAQ

1.How can I place an order for SI5342C-A-GM through Aetrix?

Please submit a Request for Quotation (RFQ) for SI5342C-A-GM 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 SI5342C-A-GM reliable?

The price and inventory of SI5342C-A-GM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI5342C-A-GM is usually 5 days.

3.What payment methods are accepted for SI5342C-A-GM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI5342C-A-GM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI5342C-A-GM?

SI5342C-A-GM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI5342C-A-GM 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 SI5342C-A-GM?

For technical support, including SI5342C-A-GM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI5342C-A-GM requirements.

6.How does Aetrix verify that SI5342C-A-GM is sourced from the original manufacturer or authorized distributors?

All SI5342C-A-GM 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 SI5342C-A-GM meets industry standards.

7.What is the process for return or replacement of SI5342C-A-GM?

All SI5342C-A-GM units undergo pre-shipment inspection (PSI). If there is an issue with SI5342C-A-GM, 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 SI5342C-A-GM part is unused and in its original packaging.

Return procedure for SI5342C-A-GM:

1.Submit a request within 90 days.

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

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