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

Skyworks Solutions Inc. SI5338N-B04252-GM

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

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Part No.:: SI5338N-B04252-GM

Manufacturer:: Skyworks Solutions Inc.

Category:: Application Specific Clock/Timing

Package:: 24-VFQFN Exposed Pad

Datasheet:: SI5338N-B04252-GM.pdf

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

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Product details

Overview

SI5338N-B04252-GM from Skyworks Solutions is a quad-output, I²C-programmable clock generator implementing MultiSynth™ frequency synthesis with 0 ppm precision per output. It delivers four independent differential or single-ended clocks (LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL) across 0.16–710 MHz, supports PCIe Gen 1–4 common-clock and SRNS compliance, and operates from 1.8/2.5/3.3 V core supply in a 4×4 mm 24-QFN package for FPGA, processor, and Ethernet switch timing.

For engineers reviewing the SI5338N-B04252-GM datasheet, SI5338N-B04252-GM pinout, SI5338N-B04252-GM application, or SI5338N-B04252-GM equivalent, key selection criteria include its 0.7 ps RMS typical phase jitter, independent per-output voltage (1.5–3.3 V), flexible reference inputs (crystal, CMOS, SSTL, differential), glitchless 1 ppm frequency increment/decrement, and <20 ps phase step resolution.

Technical Context

The SI5338N-B04252-GM integrates two-stage PLL architecture: a high-stability integer-N PLL (Stage 1) locks to input references (8–30 MHz crystal or 5–710 MHz differential/CMOS), followed by four independent MultiSynth™ fractional-N synthesizers (Stage 2) generating outputs with sub-ppb resolution. Each output driver is fully configurable for format, voltage, and termination.

It supports external feedback for zero-delay mode, loss-of-lock and loss-of-signal alarms, and I²C/SMBus programming with ClockBuilder Pro software. The device enables true any-frequency synthesis without external components-replacing up to four discrete oscillators while maintaining PCIe Gen 4 SRNS-compliant jitter performance at ≤0.45 ps RMS.

Key Specifications

Parameter	Value and Actual Design Meaning
Phase Jitter (RMS)	0.7 ps typical (12 kHz–20 MHz); meets PCIe Gen 3/4 SRNS and GbE jitter requirements
Output Frequency Range	0.16–710 MHz per channel; supports LVPECL (≤710 MHz), LVDS (≤350 MHz), HCSL (≤250 MHz), CMOS (≤200 MHz), SSTL/HSTL (≤350 MHz)
Input Reference Support	Crystal (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), differential (5–710 MHz)
Supply Voltages	Core: 1.8/2.5/3.3 V ±10%; Output buffers: independently configurable 1.5/1.8/2.5/3.3 V
Package & Pins	24-pin QFN, 4 × 4 mm; 4 differential clock outputs (CLK0A/B–CLK3A/B), 2 differential inputs (IN1/2, IN5/6), 2 single-ended inputs (IN3/4), I²C interface (SCL/SDA), interrupt (INTR)
Temperature Range	–40 °C to +85 °C ambient; qualified for industrial and telecom line card deployment
Power Consumption	45 mA typical core current (100 MHz on all outputs, 25 MHz refclk); <12 mA in buffer-only mode

Pinout & Package

SI5338N-B04252-GM uses a 24-lead, 4 × 4 mm QFN package with exposed thermal pad. Pin assignments are standardized across Si5338 variants per Skyworks Rev. 1.6 datasheet (page 37).

Pin/Terminal	Circuit Role	Design Meaning
CLK0A / CLK0B	Differential Output Pair 0	LVPECL/LVDS/HCSL/CML-capable; independently configured format, frequency, voltage, and phase
CLK1A / CLK1B	Differential Output Pair 1	Same configurability as CLK0; supports integer/fractional synthesis with <20 ps phase step accuracy
CLK2A / CLK2B	Differential Output Pair 2	Programmable drive strength and termination; supports spread-spectrum modulation (0.5–5.0% spread, 33–63 kHz)
CLK3A / CLK3B	Differential Output Pair 3	Independent frequency increment/decrement control via dedicated pins (FINC/FDEC) for real-time tuning
IN1 / IN2	Differential Input Pair 1	Accepts 5–710 MHz AC-coupled differential clocks; internal 100 Ω termination option
IN3 / IN4	Single-Ended Input Pair	Supports CMOS/SSTL/HSTL inputs (5–350 MHz); VIH/VIL referenced to VDD
SCL / SDA	I²C Serial Interface	Standard-mode (100 kHz) and fast-mode (400 kHz) compatible; used for full register configuration and status readback
INTR	Interrupt Output	Open-drain active-low signal indicating loss-of-lock, loss-of-signal, or programmable alarm conditions
VDD / VDDO0–VDDO3	Power Supplies	VDD = core supply (1.8/2.5/3.3 V); VDDOx = independent output buffer supplies (1.5/1.8/2.5/3.3 V)

Key Features

Feature	Design Value
MultiSynth™ Any-Frequency Synthesis	Four independent outputs each capable of generating any frequency from 0.16–710 MHz with true zero-ppm accuracy and sub-ppb resolution
PCIe Gen 4 Common Clock Compliance	0.15–0.45 ps RMS jitter (10 kHz–50 MHz) meets PCIe Base Spec 4.0 rev. 0.5 for common-clock architectures
Glitchless Frequency Tuning	Independent FINC/FDEC pins enable real-time 1 ppm-step frequency adjustment without output interruption or phase discontinuity
Per-Output Voltage & Format Control	Each of four output drivers supports selectable voltage (1.5/1.8/2.5/3.3 V) and signal format (LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL)
Spread Spectrum Clocking (SSC)	Configurable on any output: spread range 0.5–5.0%, modulation rate 33–63 kHz, enabling EMI reduction without altering system timing margins
Zero-Delay Mode Support	External feedback path allows synchronous alignment of output clocks to input reference-critical for deterministic latency in telecom and broadcast video

Applications

Ethernet Switch Timing	PCIe Gen 4 Server Interconnect
Use Scenario: High-density 10/25/100 GbE switch fabric requiring synchronized clocks across multiple SerDes lanes and packet processing ASICs. IC Role / Device Role / Timing Role: Quad-output clock generator providing four independent, low-jitter clocks (e.g., 156.25 MHz, 312.5 MHz, 625 MHz, 1.25 GHz divided) for PHY, MAC, and CPU domains. Use Value: Eliminates four discrete oscillators; achieves <0.45 ps RMS PCIe Gen 4 jitter compliance and <100 ps output-to-output skew across all four channels.	Use Scenario: Dual-CPU server motherboard with PCIe Gen 4 x16 slots, NVMe SSDs, and PLX switches demanding strict common-clock jitter and skew control. IC Role / Device Role / Timing Role: Central timing hub delivering synchronized 100 MHz common reference to all PCIe endpoints and root complexes. Use Value: Meets PCIe Gen 4 SRNS jitter spec (≤0.32 ps RMS) and supports spread-spectrum modulation to reduce EMI without violating PCIe timing windows.
Broadcast Video Synchronization	FPGA-Based Industrial Controller
Use Scenario: SMPTE 2082/2081 12G-SDI router requiring frame-accurate genlock across multiple video processing modules. IC Role / Device Role / Timing Role: Configurable clock source generating 74.25 MHz, 148.5 MHz, and 297 MHz outputs with programmable phase offsets for pixel-level alignment. Use Value: <20 ps phase step resolution and <45 ns initial phase offset range enable precise inter-module synchronization without external delay lines.	Use Scenario: Programmable logic controller (PLC) with dual FPGAs handling motion control, I/O expansion, and EtherCAT communication. IC Role / Device Role / Timing Role: Single-chip clock source for FPGA fabric clocks (100–200 MHz), transceiver reference (125 MHz), and microcontroller domain (50 MHz). Use Value: Independent output voltage control (1.8 V for FPGA I/O, 3.3 V for MCU) reduces need for external level shifters; I²C reprogramming enables field firmware updates to timing parameters.

Ethernet Switch Timing

PCIe Gen 4 Server Interconnect

Use Scenario: High-density 10/25/100 GbE switch fabric requiring synchronized clocks across multiple SerDes lanes and packet processing ASICs.

IC Role / Device Role / Timing Role: Quad-output clock generator providing four independent, low-jitter clocks (e.g., 156.25 MHz, 312.5 MHz, 625 MHz, 1.25 GHz divided) for PHY, MAC, and CPU domains.

Use Value: Eliminates four discrete oscillators; achieves <0.45 ps RMS PCIe Gen 4 jitter compliance and <100 ps output-to-output skew across all four channels.

Use Scenario: Dual-CPU server motherboard with PCIe Gen 4 x16 slots, NVMe SSDs, and PLX switches demanding strict common-clock jitter and skew control.

IC Role / Device Role / Timing Role: Central timing hub delivering synchronized 100 MHz common reference to all PCIe endpoints and root complexes.

Use Value: Meets PCIe Gen 4 SRNS jitter spec (≤0.32 ps RMS) and supports spread-spectrum modulation to reduce EMI without violating PCIe timing windows.

Broadcast Video Synchronization

FPGA-Based Industrial Controller

Use Scenario: SMPTE 2082/2081 12G-SDI router requiring frame-accurate genlock across multiple video processing modules.

IC Role / Device Role / Timing Role: Configurable clock source generating 74.25 MHz, 148.5 MHz, and 297 MHz outputs with programmable phase offsets for pixel-level alignment.

Use Value: <20 ps phase step resolution and <45 ns initial phase offset range enable precise inter-module synchronization without external delay lines.

Use Scenario: Programmable logic controller (PLC) with dual FPGAs handling motion control, I/O expansion, and EtherCAT communication.

IC Role / Device Role / Timing Role: Single-chip clock source for FPGA fabric clocks (100–200 MHz), transceiver reference (125 MHz), and microcontroller domain (50 MHz).

Use Value: Independent output voltage control (1.8 V for FPGA I/O, 3.3 V for MCU) reduces need for external level shifters; I²C reprogramming enables field firmware updates to timing parameters.

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, lower jitter (0.35 ps RMS), but larger 5×5 mm 32-QFN package and higher power (65 mA typ)	Preferred for new designs needing >4 outputs or ultra-low jitter; not drop-in due to pin count, footprint, and register map differences	Select when expanding channel count or tightening jitter budgets beyond SI5338N-B04252-GM capability; requires PCB redesign.
ICS8430I-01T	Fixed-function 4-output LVDS generator (no I²C programming); 0.9 ps RMS jitter; 3.3 V only; no spread spectrum or phase adjustment	Suitable only for static, non-reconfigurable clock trees; lacks flexibility for multi-standard systems (PCIe + Ethernet + video)	Choose only for cost-sensitive, fixed-frequency applications where field reconfiguration and multi-format support are unnecessary.

Compared with Si5332A-D06189-GM, SI5338N-B04252-GM offers smaller footprint and lower power at the expense of output count and jitter floor; versus ICS8430I-01T, it provides full programmability and multi-standard compliance at higher BOM and design complexity cost.

Availability

SI5338N-B04252-GM is available at Aetrix Electronics and suitable for Ethernet switch/router, PCIe Gen 1–4 server interconnect, broadcast video timing, and FPGA-based industrial controller applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for SI5338N-B04252-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, with leadership in RF, timing, and power management ICs for infrastructure, automotive, and mobile markets.

The Si5338 product line was designed to replace multiple discrete oscillators in high-speed digital systems, delivering programmable, low-jitter clock generation for PCIe, Ethernet, telecom, and broadcast video applications with minimal board space and design effort.

FAQ

What is the maximum output frequency supported by SI5338N-B04252-GM in LVPECL format?

The SI5338N-B04252-GM supports LVPECL outputs up to 710 MHz per channel, as confirmed in Table 6 of the Skyworks Rev. 1.6 datasheet. This capability enables direct clocking of high-speed SerDes interfaces such as 100G KR4 and 200G CAUI-4 without external frequency multiplication. Operation above 350 MHz is limited to two unique frequencies simultaneously (Fvco/4 and Fvco/6) due to VCO constraints.

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

Yes, SI5338N-B04252-GM meets PCIe Gen 4 SRNS requirements with ≤0.32 ps RMS jitter (10 kHz–50 MHz) when configured with PLL bandwidth of 2–4 MHz and CDR = 10 MHz, as specified in Table 12 of the datasheet. This compliance is validated using the Skyworks PCIe Clock Jitter Tool and aligns with PCI-Express Base Specification 4.0 rev. 0.5.

Can SI5338N-B04252-GM generate different output voltages on each of its four clock drivers?

Yes, SI5338N-B04252-GM provides independent VDDO0–VDDO3 supplies, allowing each of its four output drivers to be set to 1.5 V, 1.8 V, 2.5 V, or 3.3 V. This eliminates external level shifters in mixed-voltage systems-for example, driving 1.8 V FPGA I/O banks and 3.3 V microcontroller peripherals from a single SI5338N-B04252-GM device.

How is the SI5338N-B04252-GM programmed, and is external hardware required?

SI5338N-B04252-GM is programmed via its I²C/SMBus-compatible interface using Skyworks' ClockBuilder Pro software. No external programmer is required-configuration is performed through a standard USB-to-I²C adapter (e.g., Si5338-EVB or third-party FT232H). The device includes one-time-programmable (OTP) NVM to retain settings after power cycle.

What reference inputs does SI5338N-B04252-GM accept, and what is the minimum crystal frequency supported?

SI5338N-B04252-GM accepts crystal (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), and differential (5–710 MHz) references. The minimum supported crystal frequency is 8 MHz, as defined in Table 8–11 of the datasheet; crystals below 8 MHz require external buffering and are not natively supported.

SI5338N-B04252-GM Specifications

Product attributes: Attribute value

Manufacturer:: Skyworks Solutions Inc.

Series:: MultiSynth™

Package/Case:: 24-VFQFN Exposed Pad

Packaging:: Tray

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-GM FAQ

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

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

The price and inventory of SI5338N-B04252-GM 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-GM is usually 5 days.

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

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

Note: Certain payment methods may incur a processing fee.

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

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

Once your SI5338N-B04252-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 SI5338N-B04252-GM?

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

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

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

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

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

Return procedure for SI5338N-B04252-GM:

1.Submit a request within 90 days.

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

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