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

Skyworks Solutions Inc. SI5338C-B04503-GM

Name: SI5338C-B04503-GM
Brand: Skyworks Solutions Inc.
SKU: SI5338C-B04503-GM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI5338C-B04503-GM

Manufacturer:: Skyworks Solutions Inc.

Category:: Application Specific Clock/Timing

Package:: 24-VFQFN Exposed Pad

Datasheet:: SI5338C-B04503-GM.pdf

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

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Product details

Overview

SI5338C-B04503-GM from Skyworks Solutions is a quad-output, I²C-programmable clock generator with MultiSynth™ frequency synthesis, delivering four independent low-jitter clocks (0.7 ps RMS typ) across LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL formats, supporting PCIe Gen 1–4 and Ethernet timing in telecom line cards and FPGA-based systems.

For engineers reviewing the SI5338C-B04503-GM datasheet, SI5338C-B04503-GM pinout, SI5338C-B04503-GM application, or SI5338C-B04503-GM equivalent, key selection considerations include its 24-QFN package, 4× differential output capability, ±0.1 ppm synthesis resolution, spread-spectrum control per output, and support for external crystal (8–30 MHz) or high-frequency differential inputs (up to 710 MHz).

Technical Context

The SI5338C-B04503-GM implements a two-stage PLL architecture: a high-stability reference stage followed by four independent MultiSynth™ fractional-N synthesizers, each driving a configurable output buffer. It supports both free-running synthesis and synchronous frequency translation modes.

Its I²C/SMBus interface enables full register-level configuration of output format, voltage (1.5/1.8/2.5/3.3 V), phase offset (±45 ns), frequency increment/decrement (1 ppm steps), and spread-spectrum parameters (0.5–5.0% deviation, 33–63 kHz modulation rate), all without disrupting output clocks.

Key Specifications

Parameter	Value and Actual Design Meaning
Output count & type	4 differential outputs (CLK0A/B through CLK3A/B), configurable as LVPECL/LVDS/HCSL/CML/SSTL/HSTL/CMOS
Phase jitter (RMS)	0.7 ps typical (12 kHz–20 MHz), compliant with PCIe Gen 3 SRNS and GbE jitter requirements
Synthesis resolution	1 ppb frequency step size, enabling true zero-ppm accuracy on all outputs
Input flexibility	Supports 8–30 MHz crystal, 5–200 MHz CMOS, 5–350 MHz SSTL/HSTL, or 5–710 MHz differential reference
Supply & temp	Single 1.8/2.5/3.3 V core supply; operates from –40 °C to +85 °C
Package	24-pin QFN, 4 mm × 4 mm, 0.5 mm pitch, exposed thermal pad
Power consumption	45 mA typical core current at 100 MHz on all outputs with 25 MHz reference

Pinout & Package

SI5338C-B04503-GM is housed in a 24-lead, 4 mm × 4 mm QFN package with wettable flanks and an exposed thermal pad. Pin 1 is top-left (IN1), pin 24 is bottom-right (GND). The package supports reflow soldering per JEDEC J-STD-020 (peak 260 °C).

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 input pins	Support CMOS/SSTL/HSTL inputs up to 350 MHz; VIH = 0.7×VDD, VIL = 0.3×VDD
CLK0A–CLK3B	Differential output pairs	Four independent output drivers; each configurable for format, voltage, and slew rate
VDDO0–VDDO3	Output buffer supplies	Independent 1.5/1.8/2.5/3.3 V rails per output bank; enable mixed-voltage system interfacing
VDD	Core supply	Single 1.8/2.5/3.3 V supply with >60 dB PSRR; powers PLL, MultiSynth, and control logic
SCL, SDA	I²C interface	Standard SMBus-compatible serial bus (up to 400 kHz); supports write-only programming and read-back status
INTR	Interrupt output	Open-drain flag indicating loss-of-lock or loss-of-signal; active-low, 3 mA sink capability
GND, RSVD_GND	Ground terminals	Eight dedicated ground pins including thermal pad connection; critical for jitter performance and EMI control

Key Features

Feature	Design Value
Independent per-output phase adjustment	±45 ns range in <20 ps steps, enabling precise skew compensation across multi-lane interfaces like PCIe or DDR
Glitchless frequency tuning	Real-time 1 ppm increment/decrement via PINC/FDEC pins or I²C, no output interruption during update
Configurable spread spectrum	Per-output SSC with programmable deviation (0.5–5.0%), rate (33–63 kHz), and direction (down/spread-center)
External feedback mode	Enables zero-delay clock distribution by feeding back a system clock to the PLL reference path
Loss-of-signal monitoring	Detects input failure in 2.6–5 µs and releases alarm in 0.01–1 µs, supporting fail-safe system timing recovery

Applications

PCIe Gen 4 Switch Timing	Ethernet Switch Clocking
Use Scenario: Providing synchronized 100 MHz reference clocks to multiple PCIe Gen 4 switch ASICs in a 1U data center switch chassis. IC Role / Device Role / Timing Role: Quad-output clock generator delivering four independent, low-jitter HCSL clocks meeting PCIe Gen 4 Common Clock jitter spec (<0.45 ps RMS). Use Value: Eliminates need for four discrete oscillators; enables dynamic frequency margining and SSC tuning per port to pass EMI compliance.	Use Scenario: Generating 125 MHz, 156.25 MHz, and 312.5 MHz clocks for 10GbE PHYs, packet processors, and SerDes in carrier-grade Ethernet switches. IC Role / Device Role / Timing Role: Any-frequency synthesizer producing exact IEEE 802.3-compliant rates from a single 25 MHz crystal reference. Use Value: Reduces BOM count and layout area; supports multi-rate operation without changing crystals or layout.
FPGA-Based Video Processing	Telecom Line Card Synchronization
Use Scenario: Supplying pixel clock (148.5 MHz), reference clock (27 MHz), and DDR memory clock (400 MHz) to a broadcast video encoder FPGA. IC Role / Device Role / Timing Role: Configurable quad clock source with mixed-output formats (LVDS for pixel clock, SSTL for DDR, CMOS for FPGA logic). Use Value: Single-chip solution replaces three separate clock ICs; independent voltage control per output matches diverse I/O standards.	Use Scenario: Distributing stratum-3-compliant 2.048 MHz, 19.44 MHz, and 155.52 MHz clocks across SONET/SDH and OTN line card modules. IC Role / Device Role / Timing Role: High-stability frequency translator accepting OC-12 or SyncE input and generating multiple telecom-standard outputs. Use Value: Meets OC-12 random jitter spec (0.7 ps RMS typ); supports holdover via internal oscillator during reference loss.

PCIe Gen 4 Switch Timing

Ethernet Switch Clocking

Use Scenario: Providing synchronized 100 MHz reference clocks to multiple PCIe Gen 4 switch ASICs in a 1U data center switch chassis.

IC Role / Device Role / Timing Role: Quad-output clock generator delivering four independent, low-jitter HCSL clocks meeting PCIe Gen 4 Common Clock jitter spec (<0.45 ps RMS).

Use Value: Eliminates need for four discrete oscillators; enables dynamic frequency margining and SSC tuning per port to pass EMI compliance.

Use Scenario: Generating 125 MHz, 156.25 MHz, and 312.5 MHz clocks for 10GbE PHYs, packet processors, and SerDes in carrier-grade Ethernet switches.

IC Role / Device Role / Timing Role: Any-frequency synthesizer producing exact IEEE 802.3-compliant rates from a single 25 MHz crystal reference.

Use Value: Reduces BOM count and layout area; supports multi-rate operation without changing crystals or layout.

FPGA-Based Video Processing

Telecom Line Card Synchronization

Use Scenario: Supplying pixel clock (148.5 MHz), reference clock (27 MHz), and DDR memory clock (400 MHz) to a broadcast video encoder FPGA.

IC Role / Device Role / Timing Role: Configurable quad clock source with mixed-output formats (LVDS for pixel clock, SSTL for DDR, CMOS for FPGA logic).

Use Value: Single-chip solution replaces three separate clock ICs; independent voltage control per output matches diverse I/O standards.

Use Scenario: Distributing stratum-3-compliant 2.048 MHz, 19.44 MHz, and 155.52 MHz clocks across SONET/SDH and OTN line card modules.

IC Role / Device Role / Timing Role: High-stability frequency translator accepting OC-12 or SyncE input and generating multiple telecom-standard outputs.

Use Value: Meets OC-12 random jitter spec (0.7 ps RMS typ); supports holdover via internal oscillator during reference loss.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Si5338A-B-GM	Same silicon, factory-programmed with fixed configuration; lacks OTP NVM for field reprogramming	Pre-configured for specific OEM designs; not suitable for prototyping or multi-project reuse	Select SI5338C-B04503-GM when full I²C programmability and field tuning are required.
ICS8430I-01LG	Fixed-frequency, non-synthesizing quad LVDS buffer; no frequency generation or I²C interface	Limited to clock fanout and level translation; cannot replace crystal oscillators or perform frequency translation	Choose SI5338C-B04503-GM when any-frequency synthesis, jitter reduction, or flexible output formatting is needed.

Compared with Si5338A-B-GM and ICS8430I-01LG, SI5338C-B04503-GM uniquely combines field-programmable MultiSynth™ synthesis, per-output format/voltage control, and PCIe Gen 4–compliant jitter in a single 4×4 mm package-enabling design reuse across multiple platforms without hardware changes.

Availability

SI5338C-B04503-GM is available at Aetrix Electronics and suitable for PCIe switch timing, Ethernet switch clocking, FPGA-based video processing, and telecom line card synchronization requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for SI5338C-B04503-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 wireless, broadband, automotive, and industrial markets.

The Si5338 family is designed as a programmable, low-jitter clock generator platform targeting high-speed serial interface timing (PCIe, Ethernet, Fibre Channel) and multi-clock domain systems requiring precision frequency synthesis and flexible output formatting.

FAQ

What is the primary function of the SI5338C-B04503-GM in a system?

The SI5338C-B04503-GM serves as a quad-output, I²C-programmable clock generator that synthesizes four independent, low-jitter frequencies from a single reference. It replaces multiple discrete oscillators or buffers, supports PCIe Gen 1–4, Ethernet, and telecom timing standards, and enables dynamic frequency and phase tuning in real time without output glitches.

Does the SI5338C-B04503-GM support spread-spectrum clocking (SSC)?

Yes, the SI5338C-B04503-GM supports fully configurable spread-spectrum clocking on any output, with programmable deviation (0.5–5.0%), modulation rate (33–63 kHz), and direction (down-spread or center-spread). This feature is implemented per-output and can be enabled or disabled independently via I²C registers or pin control.

What input reference sources does the SI5338C-B04503-GM accept?

The SI5338C-B04503-GM accepts multiple reference types: an 8–30 MHz fundamental-mode crystal connected to IN1/IN2; a 5–200 MHz CMOS clock on IN3/IN4; or differential inputs up to 710 MHz on IN1/IN2 or IN5/IN6. It also supports external feedback mode for zero-delay operation using a system clock as reference.

Can the SI5338C-B04503-GM generate different output voltages simultaneously?

Yes, the SI5338C-B04503-GM provides four independent VDDOx supply pins (VDDO0–VDDO3), each configurable for 1.5 V, 1.8 V, 2.5 V, or 3.3 V. This allows simultaneous LVDS (2.5 V), HCSL (1.8 V), and CMOS (3.3 V) outputs on the same device, matching diverse I/O standards across FPGAs, ASICs, and PHYs without external level shifters.

Is the SI5338C-B04503-GM pin-compatible with other Si5338 variants?

Yes, all Si5338 variants-including SI5338C-B04503-GM-share identical 24-QFN packaging, pinout, and footprint. Differences lie in factory-programmed OTP content and default configurations; electrical and mechanical compatibility is maintained across the family for drop-in replacement in existing PCB layouts.

SI5338C-B04503-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)

SI5338C-B04503-GM FAQ

1.How can I place an order for SI5338C-B04503-GM through Aetrix?

Please submit a Request for Quotation (RFQ) for SI5338C-B04503-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 SI5338C-B04503-GM reliable?

The price and inventory of SI5338C-B04503-GM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI5338C-B04503-GM is usually 5 days.

3.What payment methods are accepted for SI5338C-B04503-GM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI5338C-B04503-GM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI5338C-B04503-GM?

SI5338C-B04503-GM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI5338C-B04503-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 SI5338C-B04503-GM?

For technical support, including SI5338C-B04503-GM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI5338C-B04503-GM requirements.

6.How does Aetrix verify that SI5338C-B04503-GM is sourced from the original manufacturer or authorized distributors?

All SI5338C-B04503-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 SI5338C-B04503-GM meets industry standards.

7.What is the process for return or replacement of SI5338C-B04503-GM?

All SI5338C-B04503-GM units undergo pre-shipment inspection (PSI). If there is an issue with SI5338C-B04503-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 SI5338C-B04503-GM part is unused and in its original packaging.

Return procedure for SI5338C-B04503-GM:

1.Submit a request within 90 days.

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

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