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

Skyworks Solutions Inc. SI5351A-B05950-GT

Name: SI5351A-B05950-GT
Brand: Skyworks Solutions Inc.
SKU: SI5351A-B05950-GT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI5351A-B05950-GT

Manufacturer:: Skyworks Solutions Inc.

Category:: Clock Generators, PLLs, Frequency Synthesizers

Package:: -

Datasheet:: SI5351A-B05950-GT.pdf

Description:: I2C PROG, ANY FREQUENCY, ANY OUT

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Product details

Overview

SI5351A-B05950-GT from Skyworks Solutions is an I²C-programmable, 8-output CMOS clock generator with integrated VCXO, designed to replace crystals, crystal oscillators, and discrete PLLs in cost-sensitive embedded systems. It delivers up to eight independent, non-integer-related frequencies from 2.5 kHz to 200 MHz with 0 ppm synthesis error, operates from a 25 or 27 MHz crystal, and supports 1.8/2.5/3.3 V output voltage levels per bank.

For engineers reviewing the SI5351A-B05950-GT datasheet, SI5351A-B05950-GT pinout, SI5351A-B05950-GT application, or SI5351A-B05950-GT equivalent, this device offers programmable spread spectrum, glitchless frequency changes, static phase offset control, and configurable rise/fall times - critical for EMI reduction, multi-domain timing, and jitter-sensitive interfaces like PCIe Gen 1 and audio clocks.

Technical Context

The SI5351A-B05950-GT implements a dual-PLL architecture (PLLA and PLLB) fed by a fixed-frequency 25/27 MHz crystal oscillator, with each PLL driving eight independent MultiSynth fractional dividers. Its VCXO functionality enables voltage-controlled tuning across ±240 ppm at 3.3 V, with linear gain (18–150 ppm/V) and <±5% linearity error over 10–90% VDD range.

All eight outputs support individual configuration: frequency, drive strength, spread spectrum (down-spread or center-spread, 0.1–2.5%), modulation rate (31.5 kHz), and output delay. Output buffers are isolated per VDDO rail (VDDOA–VDDOD), enabling mixed-voltage system interfacing without level shifters.

Key Specifications

Parameter	Value and Actual Design Meaning
Output count	8 independent CMOS clock outputs (CLK0–CLK7)
Frequency range	2.5 kHz to 200 MHz per output; only two unique frequencies >112.5 MHz simultaneously allowed
Frequency accuracy	0 ppm synthesis error (fractional divider architecture)
Period jitter (typ)	40 ps pk-pk (4 outputs active, 1 per VDDO rail); enables PCIe Gen 1 compliance
VCXO pull range	Configurable ±30 to ±240 ppm at 3.3 V; eliminates need for custom pullable crystals
Supply flexibility	Core VDD: 2.5 V or 3.3 V; output VDDOx: 1.8/2.5/3.3 V independently selectable per bank
I²C interface	Standard/Fast Mode (100/400 kbps); supports factory preprogramming via ClockBuilder Pro

Pinout & Package

SI5351A-B05950-GT is housed in a 20-pin QFN package (4 mm × 4 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are validated per Skyworks Si5351A 20-pin QFN pinout (Rev. 1.3, Section 10.1).

Pin/Terminal	Circuit Role	Design Meaning
XA, XB	Crytal oscillator input	Accepts 25 or 27 MHz AT-cut crystal; internal load capacitance selectable (0/6/8/10 pF)
SCL, SDA	I²C serial interface	Configures all registers and outputs; supports standard/fast mode; requires external pull-ups
OEB	Output enable bar	Active-low global output disable; allows synchronous power-down of all clocks
VDD, VDDOA–VDDOD	Power supply rails	Separate core (VDD) and four output-bank supplies enable mixed-voltage domain interfacing
CLK0–CLK7	Dedicated clock outputs	CMOS outputs with programmable drive strength, rise/fall time, and spread spectrum per channel
VC	VCXO control voltage	Accepts 0–VDD tuning voltage; enables ±240 ppm frequency adjustment with high linearity

Key Features

Feature	Design Value
Glitchless frequency reprogramming	Enables dynamic clock switching during operation without output interruption or metastability
Per-output spread spectrum	Reduces EMI peak emissions by up to 15 dB through configurable down-spread (–0.1% to –2.5%) or center-spread (±0.1% to ±1.5%)
Static phase offset control	Allows precise inter-output skew alignment (333 ps/step resolution) for timing-critical parallel buses
Programmable rise/fall time	Adjusts edge rates to match trace impedance and reduce ringing on long PCB traces
Low-power operation	27 mA typical supply current with all 8 outputs enabled at 3.3 V, supporting battery-powered instrumentation

Applications

Audio/Video Timing	Networking Equipment
Use Scenario: Generating synchronized sample-rate clocks (e.g., 24.576 MHz, 48 MHz, 74.25 MHz) for ADC/DAC, HDMI, and SPDIF subsystems in AV receivers and soundbars. IC Role / Device Role / Timing Role: Primary multi-frequency clock source replacing multiple discrete oscillators and jitter cleaners. Use Value: Eliminates board space and BOM cost of 3–4 separate crystals while maintaining <95 ps pk-pk period jitter required for 24-bit audio fidelity.	Use Scenario: Providing reference clocks for Ethernet PHYs (25 MHz), USB 2.0 controllers (48 MHz), and PCIe Gen 1 root complex (100 MHz) in residential gateways and SOHO routers. IC Role / Device Role / Timing Role: Single-chip clock tree generator with independent output banks for isolation between analog, digital, and high-speed serial domains. Use Value: Meets PCIe Gen 1 jitter spec (<1.5 ps RMS) via low-noise fractional synthesis and supports spread spectrum to pass FCC Class B emissions testing.
Laser Range Finders	Industrial Handheld Instruments
Use Scenario: Delivering precise timing signals (e.g., 125 MHz for time-of-flight measurement, 27 MHz for image sensor sync) in compact laser distance meters. IC Role / Device Role / Timing Role: Low-jitter, multi-output clock generator with VCXO tuning for temperature compensation of optical path delays. Use Value: VCXO linearity (<±5%) and wide pull range (±240 ppm) enable closed-loop calibration against reference temperature sensors without external varactors.	Use Scenario: Supplying clocks to microcontroller (33.333 MHz), display driver (28.322 MHz), and data acquisition ADC (48 MHz) in portable multimeters and oscilloscopes. IC Role / Device Role / Timing Role: Flexible, software-configurable clock source enabling field-upgradable timing plans via I²C. Use Value: Factory preprogrammed configuration (B05950) ensures immediate plug-and-play operation; low 27 mA active current extends battery life.

Audio/Video Timing

Networking Equipment

Use Scenario: Generating synchronized sample-rate clocks (e.g., 24.576 MHz, 48 MHz, 74.25 MHz) for ADC/DAC, HDMI, and SPDIF subsystems in AV receivers and soundbars.

IC Role / Device Role / Timing Role: Primary multi-frequency clock source replacing multiple discrete oscillators and jitter cleaners.

Use Value: Eliminates board space and BOM cost of 3–4 separate crystals while maintaining <95 ps pk-pk period jitter required for 24-bit audio fidelity.

Use Scenario: Providing reference clocks for Ethernet PHYs (25 MHz), USB 2.0 controllers (48 MHz), and PCIe Gen 1 root complex (100 MHz) in residential gateways and SOHO routers.

IC Role / Device Role / Timing Role: Single-chip clock tree generator with independent output banks for isolation between analog, digital, and high-speed serial domains.

Use Value: Meets PCIe Gen 1 jitter spec (<1.5 ps RMS) via low-noise fractional synthesis and supports spread spectrum to pass FCC Class B emissions testing.

Laser Range Finders

Industrial Handheld Instruments

Use Scenario: Delivering precise timing signals (e.g., 125 MHz for time-of-flight measurement, 27 MHz for image sensor sync) in compact laser distance meters.

IC Role / Device Role / Timing Role: Low-jitter, multi-output clock generator with VCXO tuning for temperature compensation of optical path delays.

Use Value: VCXO linearity (<±5%) and wide pull range (±240 ppm) enable closed-loop calibration against reference temperature sensors without external varactors.

Use Scenario: Supplying clocks to microcontroller (33.333 MHz), display driver (28.322 MHz), and data acquisition ADC (48 MHz) in portable multimeters and oscilloscopes.

IC Role / Device Role / Timing Role: Flexible, software-configurable clock source enabling field-upgradable timing plans via I²C.

Use Value: Factory preprogrammed configuration (B05950) ensures immediate plug-and-play operation; low 27 mA active current extends battery life.

Equivalent & Alternatives

The following parts are listed as comparable options for similar clock generator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Si5351B-B-GM	Same 20-QFN package and 8-output capability; includes full VCXO + CLKIN dual-reference support (SI5351A lacks CLKIN)	Required when external reference synchronization (e.g., to GPS PPS or network grandmaster) is needed alongside VCXO tuning	Select SI5351B-B-GM if system requires both voltage-controlled tuning and external clock locking; SI5351A-B05950-GT is sufficient for crystal-only VCXO use cases.
CDCE906PWR	6-output, 3.3 V only, no VCXO; uses integer-only PLLs (no fractional synthesis), resulting in limited frequency flexibility and residual error	Suitable for fixed-frequency fanout where exact non-integer ratios are not required	Choose CDCE906PWR only for legacy designs with simple clock fanout needs; SI5351A-B05950-GT provides superior frequency agility and 0 ppm synthesis.

Compared with Si5351B-B-GM, SI5351A-B05950-GT omits CLKIN input but retains full VCXO tuning - reducing component count and cost where external reference is unnecessary. Versus CDCE906PWR, it delivers true any-frequency generation with fractional dividers and lower jitter, enabling next-generation mixed-signal timing architectures.

Availability

SI5351A-B05950-GT is available at Aetrix Electronics and suitable for audio/video equipment, networking/communication devices, and industrial handheld instrumentation requiring stable component supply and factory-preprogrammed timing configurations.

Supply support for SI5351A-B05950-GT 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 leader in analog and mixed-signal semiconductors, specializing in RF, timing, and precision analog solutions for communications, automotive, and industrial markets.

The Si5351 family was engineered to replace discrete timing components in space-constrained, cost-sensitive systems - delivering programmable multi-frequency clock generation with VCXO stability, without requiring custom crystal procurement or complex PLL design.

FAQ

What is the primary function of the SI5351A-B05950-GT?

The SI5351A-B05950-GT is an I²C-programmable 8-output CMOS clock generator with integrated VCXO. It synthesizes up to eight independent, non-integer-related frequencies from 2.5 kHz to 200 MHz using a 25 or 27 MHz crystal reference. Its key role is to replace multiple discrete crystals, oscillators, and PLLs in embedded systems, reducing BOM count and PCB area while enabling flexible, software-defined timing. The SI5351A-B05950-GT specifically implements factory-programmed configuration B05950 for immediate deployment.

Does the SI5351A-B05950-GT support external clock input (CLKIN)?

No, the SI5351A-B05950-GT does not support external clock input. It belongs to the Si5351A variant, which relies solely on the internal crystal oscillator (XA/XB) and VCXO for frequency synthesis. Only Si5351B and Si5351C variants include CLKIN capability. The SI5351A-B05950-GT uses a 25 or 27 MHz crystal as its sole frequency reference and provides voltage-controlled tuning via the VC pin. This makes it ideal for applications requiring VCXO stability without external synchronization.

What package type and pin count does the SI5351A-B05950-GT use?

The SI5351A-B05950-GT is packaged in a 20-pin QFN (4 mm × 4 mm, 0.5 mm pitch) with exposed thermal pad. This matches the Si5351A 20-pin QFN footprint defined in Skyworks documentation (Rev. 1.3, Section 10.1). The package supports all eight clock outputs (CLK0–CLK7), dual crystal inputs (XA/XB), I²C interface (SCL/SDA), output enable (OEB), VCXO control (VC), and four independent output supply rails (VDDOA–VDDOD), enabling robust thermal performance and mixed-voltage interfacing.

How is the SI5351A-B05950-GT configured for operation?

The SI5351A-B05950-GT is factory preprogrammed with configuration code B05950, meaning its register map is loaded at manufacture and requires no runtime I²C initialization for basic operation. Users can still reconfigure it via I²C if needed using Skyworks' ClockBuilder Pro software. Configuration includes output frequencies, drive strengths, spread spectrum settings, and VCXO parameters. The device powers up with valid clocks within 2 ms (typical) after VDD reaches minimum, and supports glitchless frequency changes during operation.

What are the supported output voltage levels for the SI5351A-B05950-GT?

The SI5351A-B05950-GT supports three output voltage levels per bank: 1.8 V, 2.5 V, and 3.3 V. Each of the four output banks (VDDOA, VDDOB, VDDOC, VDDOD) can be independently powered, allowing mixed-voltage interfacing - for example, driving a 1.8 V FPGA bank and a 3.3 V microcontroller simultaneously. Core logic operates from a separate VDD rail (2.5 V or 3.3 V). This eliminates external level shifters and simplifies power domain partitioning in complex systems using the SI5351A-B05950-GT.

SI5351A-B05950-GT Specifications

Product attributes: Attribute value

Manufacturer:: Skyworks Solutions Inc.

Series:: *

Package/Case:: -

Packaging:: Tube

Product Status:: Active

Programmable:: Not Verified

Type:: -

PLL:: -

Input:: -

Output:: -

Number of Circuits:: -

Ratio - Input:Output:: -

Differential - Input:Output:: -

Frequency - Max:: -

Divider/Multiplier:: -

Voltage - Supply:: -

Operating Temperature:: -

Mounting Type:: -

Grade:: -

Qualification:: -

Supplier Device Package:: -

SI5351A-B05950-GT FAQ

1.How can I place an order for SI5351A-B05950-GT through Aetrix?

Please submit a Request for Quotation (RFQ) for SI5351A-B05950-GT 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 SI5351A-B05950-GT reliable?

The price and inventory of SI5351A-B05950-GT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI5351A-B05950-GT is usually 5 days.

3.What payment methods are accepted for SI5351A-B05950-GT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI5351A-B05950-GT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI5351A-B05950-GT?

SI5351A-B05950-GT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI5351A-B05950-GT 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 SI5351A-B05950-GT?

For technical support, including SI5351A-B05950-GT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI5351A-B05950-GT requirements.

6.How does Aetrix verify that SI5351A-B05950-GT is sourced from the original manufacturer or authorized distributors?

All SI5351A-B05950-GT 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 SI5351A-B05950-GT meets industry standards.

7.What is the process for return or replacement of SI5351A-B05950-GT?

All SI5351A-B05950-GT units undergo pre-shipment inspection (PSI). If there is an issue with SI5351A-B05950-GT, 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 SI5351A-B05950-GT part is unused and in its original packaging.

Return procedure for SI5351A-B05950-GT:

1.Submit a request within 90 days.

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

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