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Home > Products > Integrated Circuits (ICs) > Clock/Timing > Application Specific Clock/Timing

Skyworks Solutions Inc. SI5338N-B04252-GMR

Name: SI5338N-B04252-GMR
Brand: Skyworks Solutions Inc.
SKU: SI5338N-B04252-GMR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI5338N-B04252-GMR

Manufacturer:: Skyworks Solutions Inc.

Category:: Application Specific Clock/Timing

Package:: 24-VFQFN Exposed Pad

Datasheet:: SI5338N-B04252-GMR.pdf

Description:: I2C CONTROL, 4-OUTPUT, ANY FREQU

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SI5338N-B04252-GMR from Skyworks Solutions is a quad-output, I²C-programmable clock generator implementing MultiSynth™ PLL architecture to synthesize four independent output frequencies with 0 ppm precision. It supports LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL outputs up to 710 MHz, delivers 0.7 ps RMS typical phase jitter, and operates from 1.8/2.5/3.3 V core supply in PCIe Gen 1–4 and Ethernet timing applications.

For engineers reviewing the SI5338N-B04252-GMR datasheet, SI5338N-B04252-GMR pinout, SI5338N-B04252-GMR application, or SI5338N-B04252-GMR equivalent, this page provides verified technical context, validated pin functions, confirmed PCIe Gen 4 SRNS compliance, exact MultiSynth frequency resolution (1 ppb), and real-world design meaning for spread-spectrum control, phase adjustment (<20 ps steps), and loss-of-lock alarm functionality.

Technical Context

The SI5338N-B04252-GMR integrates a two-stage synthesis architecture: a high-stability PLL stage (1.6 MHz loop bandwidth) followed by four independent MultiSynth fractional-N dividers per output. Each output driver supports programmable voltage (1.5/1.8/2.5/3.3 V), format selection, and glitchless frequency increment/decrement in 1 ppm steps.

It accepts flexible references - 8–30 MHz crystal, 5–200 MHz CMOS, 5–350 MHz SSTL/HSTL, or 5–710 MHz differential inputs - and enables zero-delay mode via external feedback. Loss of signal (2.6–5 µs detection) and loss of lock (5–10 ms) alarms are hardware-asserted on INTR pin.

Key Specifications

Parameter	Value and Actual Design Meaning
Output count & type	Four differential clock outputs (CLK0A/B through CLK3A/B); supports LVPECL, LVDS, HCSL, CML, CMOS, SSTL, HSTL formats
Frequency range	0.16–710 MHz per output; integer/fractional synthesis with 1 ppb resolution enables exact protocol-matched clocks (e.g., 100.000000 MHz PCIe)
Phase jitter (RMS)	0.7 ps typical (12 kHz–20 MHz); meets PCIe Gen 4 Common Clock (0.15–0.45 ps RMS) and OC-12 (0.7 ps RMS) requirements
Supply & power	Single 1.8/2.5/3.3 V core supply; 45 mA typical core current at 100 MHz on all outputs with 25 MHz reference
Operating temperature	–40 °C to +85 °C ambient; qualified for industrial and telecom line card environments
Package	24-pin QFN, 4 mm × 4 mm, 0.5 mm pitch; exposed thermal pad for thermal management in high-density PCB layouts
I²C interface	SMBus-compatible serial interface (up to 400 kHz); supports configuration, status readback, and dynamic frequency/phase updates

Pinout & Package

SI5338N-B04252-GMR uses a 24-lead QFN package (4 mm × 4 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are validated per Skyworks Rev. 1.6 datasheet, Figure 1 (Pin Assignments) and Table 7 (Pin Descriptions).

Pin/Terminal	Circuit Role	Design Meaning
IN1, IN2, IN5, IN6	Differential input pairs	Accept 5–710 MHz AC-coupled differential clocks; require external 100 Ω termination for optimal jitter performance
IN3, IN4	Single-ended input pins	Support 5–200 MHz CMOS-level clocks; VIH = 0.7×VDD, VIL = 0.3×VDD; slew rate >1 V/ns recommended
CLK0A–CLK3B	Differential output pairs	Four independent clock outputs; each configurable for LVPECL/LVDS/HCSL/CML with programmable VDDO (1.5–3.3 V)
VDDO0–VDDO3	Output buffer supplies	Independent 1.4–3.63 V supplies per output bank; enable mixed-voltage system interfacing (e.g., 1.8 V FPGA + 3.3 V PHY)
VDD	Core supply	1.8 V (±5%), 2.5 V (±10%), or 3.3 V (±10%) core rail; PSRR optimized for noisy digital environments
SCL, SDA	I²C serial interface	Standard bidirectional bus (400 kHz max); supports device configuration, register read/write, and status monitoring
INTR	Interrupt output	Open-drain alarm pin asserting loss-of-lock (LOL) or loss-of-signal (LOS); pulled up externally to VDDIO
OEB, PINC, FINC	Hardware control inputs	Enable/disable outputs (OEB), perform glitchless ±1 ppm frequency step (PINC/FINC), or phase increment/decrement (I²C or pin)

Key Features

Feature	Design Value
MultiSynth™ synthesis	Four independent fractional-N synthesizers enabling true zero-ppm accuracy on all outputs without external crystals
PCIe Gen 4 SRNS compliance	Validated 0.11–0.32 ps RMS jitter in Separate Reference No Spread mode; meets PCI-SIG specification for Gen 3/4 root complex and endpoint timing
Programmable phase offset	–45 ns to +45 ns initial phase adjustment per output with <20 ps step resolution for skew compensation across multi-lane interfaces
Spread spectrum control	Configurable SSC on any output: 0.5–5.0% spread, 33–63 kHz modulation rate, 5–350 MHz frequency range for EMI reduction
Glitchless frequency tuning	Hardware-supported ±1 ppm frequency increment/decrement with 667 ns update time (>18 MHz outputs) for dynamic clock scaling
Input flexibility	Five reference options: crystal (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), differential (5–710 MHz), or external feedback

Applications

Ethernet Switch Timing	PCIe Gen 4 Root Complex
Use Scenario: Synchronizing 10 GbE MAC/PHY interfaces and packet buffer clocks in Layer 3 switches. IC Role / Device Role / Timing Role: Quad-output clock generator providing 156.25 MHz SerDes reference, 125 MHz GMII, 25 MHz management bus, and 100 MHz CPU clock. Use Value: Eliminates four discrete oscillators; achieves sub-1 ps RMS jitter required for IEEE 802.3ae compliance and low BER under PVT variation.	Use Scenario: Supplying synchronized clocks to CPU, GPU, and NVMe controllers in server motherboards. IC Role / Device Role / Timing Role: PCIe Gen 4 Common Clock source delivering 100 MHz reference to root complex and endpoints with SRNS-compliant jitter. Use Value: Meets PCIe Base Spec 4.0 jitter limits (0.15–0.45 ps RMS); enables stable link training and Gen 4 x16 lane operation without retiming.
Broadcast Video Synchronization	FPGA-Based Protocol Converter
Use Scenario: Aligning frame timing across SDI transmitters, video processors, and audio embedders in broadcast encoders. IC Role / Device Role / Timing Role: Generating 27 MHz SMPTE ST 292, 74.25 MHz HDMI, 148.5 MHz 4K UHD, and 100 MHz system controller clock from single crystal. Use Value: Zero-ppm synthesis ensures frame-accurate genlock across multiple video domains; eliminates drift-induced lip-sync errors.	Use Scenario: Providing protocol-specific clocks to FPGA logic implementing SATA-to-PCIe bridging and DDR4 memory controller. IC Role / Device Role / Timing Role: Delivering 600 MHz DDR4 clock, 150 MHz SATA reference, 100 MHz PCIe, and 50 MHz FPGA fabric clock from one device. Use Value: Reduces BOM count and layout area; independent voltage per output (1.2 V DDR4, 3.3 V SATA) avoids level-shifter components.

Ethernet Switch Timing

PCIe Gen 4 Root Complex

Use Scenario: Synchronizing 10 GbE MAC/PHY interfaces and packet buffer clocks in Layer 3 switches.

IC Role / Device Role / Timing Role: Quad-output clock generator providing 156.25 MHz SerDes reference, 125 MHz GMII, 25 MHz management bus, and 100 MHz CPU clock.

Use Value: Eliminates four discrete oscillators; achieves sub-1 ps RMS jitter required for IEEE 802.3ae compliance and low BER under PVT variation.

Use Scenario: Supplying synchronized clocks to CPU, GPU, and NVMe controllers in server motherboards.

IC Role / Device Role / Timing Role: PCIe Gen 4 Common Clock source delivering 100 MHz reference to root complex and endpoints with SRNS-compliant jitter.

Use Value: Meets PCIe Base Spec 4.0 jitter limits (0.15–0.45 ps RMS); enables stable link training and Gen 4 x16 lane operation without retiming.

Broadcast Video Synchronization

FPGA-Based Protocol Converter

Use Scenario: Aligning frame timing across SDI transmitters, video processors, and audio embedders in broadcast encoders.

IC Role / Device Role / Timing Role: Generating 27 MHz SMPTE ST 292, 74.25 MHz HDMI, 148.5 MHz 4K UHD, and 100 MHz system controller clock from single crystal.

Use Value: Zero-ppm synthesis ensures frame-accurate genlock across multiple video domains; eliminates drift-induced lip-sync errors.

Use Scenario: Providing protocol-specific clocks to FPGA logic implementing SATA-to-PCIe bridging and DDR4 memory controller.

IC Role / Device Role / Timing Role: Delivering 600 MHz DDR4 clock, 150 MHz SATA reference, 100 MHz PCIe, and 50 MHz FPGA fabric clock from one device.

Use Value: Reduces BOM count and layout area; independent voltage per output (1.2 V DDR4, 3.3 V SATA) avoids level-shifter components.

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-output programmable clock generator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Si5332A-D06189-GM	Higher integration: 8 outputs, integrated crystal option, lower jitter (0.35 ps RMS), but larger 32-QFN package and higher cost	Preferred for new designs requiring >4 outputs or ultra-low-jitter 100G optical interfaces; not drop-in compatible due to pinout and register map differences	Select when needing ≥8 outputs or sub-0.4 ps RMS jitter; requires PCB redesign and firmware revalidation
ICS853S02AGI-01LF	Fixed-frequency, non-programmable quad LVDS buffer; no PLL, no frequency synthesis, 1.2 ps RMS jitter, 16-TSSOP package	Limited to static clock fanout; cannot replace crystal oscillators or translate frequencies; suitable only for simple clock distribution	Choose only for legacy systems with fixed 100/125/156.25 MHz requirements and no need for programmability or jitter cleanup

Compared with Si5332A-D06189-GM, SI5338N-B04252-GMR offers proven cost-effective programmability in a compact 24-QFN while meeting PCIe Gen 4 and 10GbE jitter specs; versus ICS853S02AGI-01LF, it adds full synthesis capability and dynamic control at the expense of static-buffer simplicity.

Availability

SI5338N-B04252-GMR is available at Aetrix Electronics and suitable for PCIe Gen 4 server platforms, 10 GbE switch/router designs, and broadcast video timing systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for SI5338N-B04252-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 leader in analog semiconductors, specializing in RF, timing, and connectivity solutions for infrastructure, automotive, and mobile markets.

The Si5338 product line was designed to replace multiple fixed-frequency oscillators with a single programmable clock generator for high-speed serial interfaces including PCIe, Ethernet, and Fibre Channel, emphasizing low jitter, flexible I/O, and ease of configuration via ClockBuilder Pro software.

FAQ

What is the maximum output frequency supported by SI5338N-B04252-GMR?

The SI5338N-B04252-GMR supports up to 710 MHz on LVPECL/LVDS/CML outputs, 350 MHz on SSTL/HSTL, 250 MHz on HCSL, and 200 MHz on CMOS. Frequencies above 350 MHz are limited to two unique values simultaneously (Fvco/4 and Fvco/6) per Skyworks Rev. 1.6 datasheet Table 6 note 6.

Does SI5338N-B04252-GMR support PCIe Gen 4 Separate Reference No Spread (SRNS) mode?

Yes, SI5338N-B04252-GMR is explicitly validated for PCIe Gen 4 SRNS operation with 0.11–0.32 ps RMS jitter (Table 12), meeting PCI-SIG Base Specification 4.0 requirements when configured with PLL bandwidth of 2–4 MHz and CDR = 10 MHz.

How many independent supply voltages can be applied to the output buffers of SI5338N-B04252-GMR?

SI5338N-B04252-GMR supports four independent output buffer supplies (VDDO0–VDDO3), each configurable from 1.4 V to 3.63 V. This allows mixed-voltage operation - for example, driving a 1.8 V FPGA bank and a 3.3 V PHY simultaneously without external level shifters.

What is the phase adjustment resolution and range for SI5338N-B04252-GMR outputs?

Each output of SI5338N-B04252-GMR supports programmable initial phase offset from –45 ns to +45 ns with <20 ps step resolution (Table 5), enabling precise inter-channel skew alignment critical for multi-lane SerDes and DDR interfaces.

Can SI5338N-B04252-GMR operate in clock buffer (PLL bypass) mode?

Yes, SI5338N-B04252-GMR supports clock buffer mode with additive phase jitter as low as 0.165 ps RMS (12 kHz–20 MHz) for 622.08 MHz differential input. In this mode, it provides low-latency (<4 ns propagation delay), low-jitter fanout without frequency translation.

SI5338N-B04252-GMR Specifications

Product attributes: Attribute value

Manufacturer:: Skyworks Solutions Inc.

Series:: MultiSynth™

Package/Case:: 24-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

PLL:: -

Main Purpose:: -

Input:: -

Output:: -

Number of Circuits:: -

Ratio - Input:Output:: -

Differential - Input:Output:: -

Frequency - Max:: -

Voltage - Supply:: -

Operating Temperature:: -

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 24-QFN (4x4)

SI5338N-B04252-GMR FAQ

1.How can I place an order for SI5338N-B04252-GMR through Aetrix?

Please submit a Request for Quotation (RFQ) for SI5338N-B04252-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 SI5338N-B04252-GMR reliable?

The price and inventory of SI5338N-B04252-GMR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI5338N-B04252-GMR is usually 5 days.

3.What payment methods are accepted for SI5338N-B04252-GMR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI5338N-B04252-GMR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI5338N-B04252-GMR?

SI5338N-B04252-GMR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI5338N-B04252-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 SI5338N-B04252-GMR?

For technical support, including SI5338N-B04252-GMR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI5338N-B04252-GMR requirements.

6.How does Aetrix verify that SI5338N-B04252-GMR is sourced from the original manufacturer or authorized distributors?

All SI5338N-B04252-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 SI5338N-B04252-GMR meets industry standards.

7.What is the process for return or replacement of SI5338N-B04252-GMR?

All SI5338N-B04252-GMR units undergo pre-shipment inspection (PSI). If there is an issue with SI5338N-B04252-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 SI5338N-B04252-GMR part is unused and in its original packaging.

Return procedure for SI5338N-B04252-GMR:

1.Submit a request within 90 days.

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

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