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

Skyworks Solutions Inc. SI5338C-B12241-GMR

Name: SI5338C-B12241-GMR
Brand: Skyworks Solutions Inc.
SKU: SI5338C-B12241-GMR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI5338C-B12241-GMR

Manufacturer:: Skyworks Solutions Inc.

Category:: Application Specific Clock/Timing

Package:: 24-VFQFN Exposed Pad

Datasheet:: SI5338C-B12241-GMR.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SI5338C-B12241-GMR from Skyworks Solutions is an I²C-programmable quad clock generator with four independently configurable differential or single-ended outputs, 0.7 ps RMS typical phase jitter, PCIe Gen 1–4 Common Clock and Gen 3 SRNS compliance, and operation across –40 to +85 °C. It replaces up to four crystal oscillators in Ethernet switch/router, PCIe, and FPGA clocking systems.

For engineers reviewing the SI5338C-B12241-GMR datasheet, SI5338C-B12241-GMR pinout, SI5338C-B12241-GMR application, or SI5338C-B12241-GMR equivalent, key selection criteria include its MultiSynth™-based any-frequency synthesis (0.16–710 MHz per output), independent output voltage support (1.5/1.8/2.5/3.3 V), spread-spectrum capability (0.5–5.0% down-spread), and 24-QFN package compatibility with high-density PCB layouts.

Technical Context

The SI5338C-B12241-GMR implements a two-stage PLL architecture: a high-stability integer-N PLL (Stage 1) locks to one of six input references (crystal, CMOS, SSTL/HSTL, or differential), followed by four independent MultiSynth™ fractional-N synthesizers (Stage 2) generating each output. Each synthesizer supports integer or fractional mode with <20 ps programmable phase step resolution and 1 ppm frequency increment/decrement.

Its output stage provides per-driver configuration for LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL formats, with independent VDDO supplies and internal 22 Ω series termination. The device supports external feedback for zero-delay mode and includes loss-of-lock and loss-of-signal alarms via the INTR pin.

Key Specifications

Parameter	Value and Actual Design Meaning
Phase Jitter (RMS)	0.7 ps typical (12 kHz–20 MHz); meets PCIe Gen 3 SRNS and GbE jitter requirements
Output Frequency Range	0.16–710 MHz per channel; supports up to two >350 MHz outputs simultaneously (Fvco/4 & Fvco/6)
Input Reference Support	Crystal (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), differential (5–710 MHz)
Output Formats	LVPECL, LVDS, HCSL, CML, CMOS, SSTL, HSTL - each driver independently selectable
Supply Voltages	VDD core: 1.8/2.5/3.3 V ±10%; VDDO per output: 1.4–3.63 V - enables mixed-voltage system interfacing
Package	24-pin QFN, 4 × 4 mm, 0.5 mm pitch - compatible with standard reflow profiles and high-density routing
Operating Temperature	–40 to +85 °C - qualified for industrial and telecom line card environments

Pinout & Package

SI5338C-B12241-GMR is housed in a 24-lead, 4 × 4 mm QFN package with exposed thermal pad. Pin assignments are fixed per the Si5338 family and validated for this variant.

Pin/Terminal	Circuit Role	Design Meaning
IN1, IN2, IN5, IN6	Differential Input Pairs	Accept AC-coupled differential clocks up to 710 MHz; require external 100 Ω termination
IN3, IN4	Single-Ended Inputs	Support CMOS/SSTL/HSTL inputs (5–350 MHz); VIH/VIL referenced to VDD
CLK0A/CLK0B through CLK3A/CLK3B	Differential Output Pairs	Four independent LVPECL/LVDS/HCSL/CML outputs; each pair shares VDDOx supply
VDDO0–VDDO3	Output Buffer Supplies	Independent 1.4–3.63 V supplies per output bank - enable mixed-signal voltage domain interfacing
VDD	Core Supply	1.8/2.5/3.3 V ±10% core power; PSRR optimized for low-noise timing performance
SCL, SDA	I²C Interface	SMBus-compatible serial interface (up to 400 kHz); supports in-system programming and dynamic reconfiguration
INTR	Interrupt Output	Open-drain status indicator for loss-of-lock and loss-of-signal events

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 Compliance	0.15–0.45 ps RMS jitter in Common Clock mode (2–5 MHz PLL BW, 10 MHz CDR) - meets PCIe Base Spec 4.0 rev 0.5
Programmable Spread Spectrum	Configurable down-spread (0.5–5.0%) and modulation rate (33–63 kHz) on any output - reduces EMI in noise-sensitive systems
Glitchless Frequency Adjustment	1 ppm step size with pin-controlled or I²C-triggered update - enables real-time clock tuning without output interruption
Phase Adjustment Resolution	<20 ps step accuracy per output - supports precise skew alignment in multi-lane SerDes interfaces

Applications

Ethernet Switch/Router Timing	PCIe Gen 1–4 Clocking
Use Scenario: High-port-count Layer 3 switches requiring synchronous 125 MHz, 156.25 MHz, and 312.5 MHz clocks for PHYs, MACs, and packet processors. IC Role / Device Role / Timing Role: Quad-output clock generator providing jitter-clean, independently configured clocks to multiple ASICs and PHYs from a single reference. Use Value: Eliminates four discrete oscillators and associated layout area; meets IEEE 802.3bj/802.3by jitter specs (<1 ps RMS) via MultiSynth™ synthesis.	Use Scenario: Server motherboard with CPU, GPU, NVMe, and add-in cards needing compliant common-clock or SRNS timing for PCIe Gen 3/4 links. IC Role / Device Role / Timing Role: PCIe-compliant clock source delivering 100 MHz HCSL clocks with sub-0.32 ps RMS jitter (Gen 3 SRNS) and 0.45 ps RMS (Gen 4). Use Value: Passes Intel Clock Jitter Tool validation; supports both common-clock and separate-reference topologies without hardware change.
Broadcast Video/Audio Sync	FPGA & Processor Clocking
Use Scenario: SMPTE ST 2082/2110 video routers requiring precise 74.25 MHz, 148.5 MHz, and 297 MHz pixel clocks with tight inter-channel skew. IC Role / Device Role / Timing Role: Multi-format clock generator supplying LVDS and HCSL outputs synchronized to a GPS-disciplined 10 MHz reference. Use Value: Achieves <100 ps output-to-output skew and <20 ps phase step resolution - enables frame-accurate genlock across multiple video paths.	Use Scenario: Industrial control FPGA (e.g., Xilinx Kintex/UltraScale+) needing 100 MHz system clock, 200 MHz DDR interface clock, 250 MHz transceiver reference, and 50 MHz debug clock. IC Role / Device Role / Timing Role: Single-chip clock source replacing multiple oscillators and buffers while supporting mixed-voltage I/O (1.8 V, 2.5 V, 3.3 V). Use Value: Reduces BOM count by 75%; independent VDDO supplies eliminate level-shifter ICs and simplify power sequencing.

Ethernet Switch/Router Timing

PCIe Gen 1–4 Clocking

Use Scenario: High-port-count Layer 3 switches requiring synchronous 125 MHz, 156.25 MHz, and 312.5 MHz clocks for PHYs, MACs, and packet processors.

IC Role / Device Role / Timing Role: Quad-output clock generator providing jitter-clean, independently configured clocks to multiple ASICs and PHYs from a single reference.

Use Value: Eliminates four discrete oscillators and associated layout area; meets IEEE 802.3bj/802.3by jitter specs (<1 ps RMS) via MultiSynth™ synthesis.

Use Scenario: Server motherboard with CPU, GPU, NVMe, and add-in cards needing compliant common-clock or SRNS timing for PCIe Gen 3/4 links.

IC Role / Device Role / Timing Role: PCIe-compliant clock source delivering 100 MHz HCSL clocks with sub-0.32 ps RMS jitter (Gen 3 SRNS) and 0.45 ps RMS (Gen 4).

Use Value: Passes Intel Clock Jitter Tool validation; supports both common-clock and separate-reference topologies without hardware change.

Broadcast Video/Audio Sync

FPGA & Processor Clocking

Use Scenario: SMPTE ST 2082/2110 video routers requiring precise 74.25 MHz, 148.5 MHz, and 297 MHz pixel clocks with tight inter-channel skew.

IC Role / Device Role / Timing Role: Multi-format clock generator supplying LVDS and HCSL outputs synchronized to a GPS-disciplined 10 MHz reference.

Use Value: Achieves <100 ps output-to-output skew and <20 ps phase step resolution - enables frame-accurate genlock across multiple video paths.

Use Scenario: Industrial control FPGA (e.g., Xilinx Kintex/UltraScale+) needing 100 MHz system clock, 200 MHz DDR interface clock, 250 MHz transceiver reference, and 50 MHz debug clock.

IC Role / Device Role / Timing Role: Single-chip clock source replacing multiple oscillators and buffers while supporting mixed-voltage I/O (1.8 V, 2.5 V, 3.3 V).

Use Value: Reduces BOM count by 75%; independent VDDO supplies eliminate level-shifter ICs and simplify power sequencing.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Si5338A-B12241-GMR	Same pinout and register map; differs only in factory-programmed NVM configuration - lacks pre-loaded PCIe Gen 4 profile	Requires full ClockBuilder Pro configuration for PCIe Gen 4; not pre-validated for SRNS mode	Select SI5338C-B12241-GMR when PCIe Gen 4 SRNS compliance and out-of-box validation are required.
LMK04832ISQE/NOPB	Two PLLs + 14 outputs; higher integration but larger 64-QFN package; 0.18 ps RMS jitter (lower), no integrated crystal oscillator support	Targets ultra-low-jitter applications (e.g., radar, test equipment); requires external crystal or clock source	Choose LMK04832 when >4 outputs or sub-0.2 ps jitter is mandatory; SI5338C-B12241-GMR offers better cost, size, and crystal integration.

Compared with Si5338A-B12241-GMR, the SI5338C-B12241-GMR delivers pre-validated PCIe Gen 4 SRNS timing without configuration overhead; versus LMK04832, it trades output count and ultimate jitter performance for smaller footprint, integrated crystal support, and lower system-level BOM cost.

Availability

SI5338C-B12241-GMR is available at Aetrix Electronics and suitable for Ethernet switch/router timing, PCIe Gen 1–4 clocking, and broadcast video/audio synchronization requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for SI5338C-B12241-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 and mixed-signal semiconductors, specializing in RF, mobile, infrastructure, and timing solutions with broad manufacturing scale and automotive-grade reliability.

The Si5338 product line was designed for high-performance, software-configurable clock generation in datacenter, telecom, and broadcast systems - emphasizing low jitter, multi-format flexibility, and seamless integration into complex SoC/FPGA platforms.

FAQ

What is the primary function of the SI5338C-B12241-GMR?

The SI5338C-B12241-GMR is an I²C-programmable quad clock generator that synthesizes up to four independent, low-jitter output frequencies from a single input reference. Its MultiSynth™ architecture enables true zero-ppm accuracy across all outputs, making it ideal for replacing multiple discrete oscillators in PCIe, Ethernet, and FPGA-based systems. SI5338C-B12241-GMR supports differential and single-ended formats with independent voltage supplies per output bank.

Does the SI5338C-B12241-GMR support PCIe Gen 4 timing requirements?

Yes, the SI5338C-B12241-GMR is explicitly validated for PCIe Gen 4 Common Clock mode with 0.15–0.45 ps RMS jitter (12 kHz–20 MHz), meeting the PCI-Express Base Specification 4.0 rev 0.5. This validation uses a 2–5 MHz PLL bandwidth and 10 MHz CDR setting. SI5338C-B12241-GMR also supports Gen 3 Separate Reference No Spread (SRNS) with 0.11–0.32 ps RMS jitter, confirmed via Skyworks' PCIe Clock Jitter Tool.

How many input reference sources does the SI5338C-B12241-GMR accept?

The SI5338C-B12241-GMR accepts six physical input pins (IN1–IN6) configured as three differential pairs or two single-ended inputs, supporting crystal (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), and differential (5–710 MHz) references. All inputs are internally multiplexed into a single PLL stage, and the device can be configured to auto-switch between references upon loss-of-signal detection.

What output voltage levels and signal formats are supported by the SI5338C-B12241-GMR?

The SI5338C-B12241-GMR supports LVPECL, LVDS, HCSL, CML, CMOS, SSTL, and HSTL output formats across its four drivers. Each output bank (CLK0–CLK3) has an independent VDDO supply (1.4–3.63 V), enabling simultaneous 1.8 V LVDS and 3.3 V CMOS outputs. Voltage levels comply with JEDEC standards - e.g., LVDS common-mode = 1.2 V (2.5/3.3 V), CMOS VOH = VDDO – 0.3 V - ensuring interoperability with diverse logic families. SI5338C-B12241-GMR includes internal 22 Ω series termination for all differential outputs.

Is the SI5338C-B12241-GMR pin-compatible with other Si5338 variants?

Yes, all Si5338 variants - including SI5338C-B12241-GMR - share identical 24-QFN packaging, pinout, register map, and electrical characteristics. Differences reside solely in factory-programmed NVM content (e.g., default configuration, PCIe profiles). SI5338C-B12241-GMR is pre-programmed with PCIe Gen 4 Common Clock and SRNS configurations, while variants like SI5338A require full ClockBuilder Pro setup. Hardware design reuse is fully supported across the Si5338 family.

SI5338C-B12241-GMR Specifications

Product attributes: Attribute value

Manufacturer:: Skyworks Solutions Inc.

Series:: MultiSynth™

Package/Case:: 24-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Programmable:: Not Verified

PLL:: Yes with Bypass

Main Purpose:: Ethernet, Fibre Channel, PCI Express (PCIe), Telecom

Input:: CML, CMOS, HCSL, HSCT, HSTL, LVDS, LVPECL, SSTL, Crystal

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

Number of Circuits:: 1

Ratio - Input:Output:: 3:4

Differential - Input:Output:: Yes/Yes

Frequency - Max:: 200MHz

Voltage - Supply:: 1.71V ~ 1.98V, 2.25V ~ 2.75V, 2.97V ~ 3.63V

Operating Temperature:: -40°C ~ 85°C (TA)

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

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

SI5338C-B12241-GMR FAQ

1.How can I place an order for SI5338C-B12241-GMR through Aetrix?

Please submit a Request for Quotation (RFQ) for SI5338C-B12241-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 SI5338C-B12241-GMR reliable?

The price and inventory of SI5338C-B12241-GMR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI5338C-B12241-GMR is usually 5 days.

3.What payment methods are accepted for SI5338C-B12241-GMR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI5338C-B12241-GMR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI5338C-B12241-GMR?

SI5338C-B12241-GMR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI5338C-B12241-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 SI5338C-B12241-GMR?

For technical support, including SI5338C-B12241-GMR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI5338C-B12241-GMR requirements.

6.How does Aetrix verify that SI5338C-B12241-GMR is sourced from the original manufacturer or authorized distributors?

All SI5338C-B12241-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 SI5338C-B12241-GMR meets industry standards.

7.What is the process for return or replacement of SI5338C-B12241-GMR?

All SI5338C-B12241-GMR units undergo pre-shipment inspection (PSI). If there is an issue with SI5338C-B12241-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 SI5338C-B12241-GMR part is unused and in its original packaging.

Return procedure for SI5338C-B12241-GMR:

1.Submit a request within 90 days.

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

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