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

Skyworks Solutions Inc. SI5338A-B04523-GM

Name: SI5338A-B04523-GM
Brand: Skyworks Solutions Inc.
SKU: SI5338A-B04523-GM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI5338A-B04523-GM

Manufacturer:: Skyworks Solutions Inc.

Category:: Application Specific Clock/Timing

Package:: 24-VFQFN Exposed Pad

Datasheet:: SI5338A-B04523-GM.pdf

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

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Product details

Overview

SI5338A-B04523-GM 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 host/endpoint, and FPGA clocking systems.

For engineers reviewing the SI5338A-B04523-GM datasheet, SI5338A-B04523-GM pinout, SI5338A-B04523-GM application, or SI5338A-B04523-GM 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 SI5338A-B04523-GM implements a two-stage PLL architecture: a high-stability input stage with programmable R-divider followed by four independent MultiSynth™ fractional-N synthesizers, each driving a configurable output buffer. Input reference options include external crystal (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), or differential (5–710 MHz).

Each output supports LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL formats with independent supply voltage (VDDOx) and programmable phase offset (<20 ps step resolution), frequency increment/decrement (1 ppm steps), and spread-spectrum modulation (33–63 kHz rate, 0.5–5.0% deviation). Loss-of-lock and loss-of-signal alarms are integrated for system monitoring.

Key Specifications

Parameter	Value and Actual Design Meaning
Phase Jitter (RMS)	0.7 ps typical (12 kHz–20 MHz); meets PCIe Gen 4 common clock jitter spec (≤0.45 ps RMS)
Output Frequency Range	0.16–710 MHz per channel; supports integer/fractional synthesis with ≤1 ppb resolution
Input Reference Support	Crystal (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), differential (5–710 MHz)
Output Format Flexibility	LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL; up to four differential or eight single-ended outputs
Supply Voltages	Core: 1.8/2.5/3.3 V; Output buffers: independently configurable 1.5/1.8/2.5/3.3 V per driver
Operating Temperature	–40 to +85 °C; qualified for industrial and telecom line card environments
Package	24-pin QFN, 4 × 4 mm, 0.5 mm pitch; RoHS-compliant, exposed thermal pad

Pinout & Package

SI5338A-B04523-GM is housed in a 24-lead QFN package (4 × 4 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments follow Skyworks' standard Si5338 pinout, including six input pins (IN1–IN6), eight clock output terminals (CLK0A/B through CLK3A/B), four VDDOx supplies, dual core VDD, SCL/SDA/I²C interface, INTR alarm, and reserved ground.

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 (5–350 MHz); internally biased, no external pull-up needed
CLK0A–CLK3B	Differential clock outputs	Four independent output pairs; each configurable for LVPECL/LVDS/HCSL/CML with dedicated VDDOx
VDDO0–VDDO3	Output buffer supplies	Independent 1.5/1.8/2.5/3.3 V supplies per output bank; enable mixed-voltage system interfacing
SCL, SDA	I²C serial interface	SMBus-compatible 1.8/2.5/3.3 V tolerant interface for configuration and status readback
INTR	Interrupt output	Open-drain alarm signal indicating loss-of-lock or loss-of-signal on any input or output

Key Features

Feature	Design Value
MultiSynth™ Any-Frequency Synthesis	Four independent outputs each generate any frequency from 0.16 to 710 MHz with true zero-ppm accuracy
PCIe Gen 1–4 Compliance	Fully compliant with PCIe Gen 1/2/3 Common Clock and Gen 3 SRNS; validated for Gen 4 common clock jitter (≤0.45 ps RMS)
Programmable Spread Spectrum	Configurable on any output: 0.5–5.0% down-spread, 33–63 kHz modulation rate, no external components required
Glitchless Frequency Adjustment	Independent ±1 ppm frequency increment/decrement via pin or I²C; no output interruption during update
Sub-20-ps Phase Control	Per-output phase offset adjustable in <20 ps steps over ±45 ns range; enables precise timing alignment in multi-clock domains
Low-Power Core Operation	45 mA typical core current at 100 MHz on all outputs; optimized for thermally constrained embedded and networking applications

Applications

Ethernet Switch/Router Timing	PCIe Gen 3/4 Host System Clocking
Use Scenario: High-port-count 1/10 GbE switches requiring synchronized clocks across PHYs, MACs, and packet processors. IC Role / Device Role / Timing Role: Quad-output clock generator providing independent 125 MHz, 156.25 MHz, and 250 MHz clocks with sub-1 ps jitter to meet IEEE 802.3 and PCIe timing budgets. Use Value: Eliminates four discrete oscillators; reduces board area by >60% while maintaining PCIe Gen 4 common clock jitter compliance (≤0.45 ps RMS).	Use Scenario: Server motherboard or add-in card with CPU, GPU, NVMe SSD, and PLX switch-all requiring tightly aligned reference clocks. IC Role / Device Role / Timing Role: Single-chip source of PCIe Gen 3 SRNS-compliant 100 MHz and Gen 4-compliant 100 MHz clocks with independent spread-spectrum control per domain. Use Value: Enables simultaneous PCIe root complex and endpoint clocking with guaranteed SRNS jitter margin and no inter-channel skew exceeding 100 ps.
FPGA and ASIC Clock Distribution	Broadcast Video Timing Synchronization
Use Scenario: Multi-FPGA systems (e.g., radar processing, AI inference accelerators) needing multiple high-frequency clocks with precise phase relationships. IC Role / Device Role / Timing Role: Configurable quad generator delivering 300 MHz LVDS, 200 MHz HCSL, 100 MHz LVPECL, and 50 MHz CMOS from one device with programmable phase offsets. Use Value: Replaces discrete clock trees and fanout buffers; achieves <20 ps inter-output phase step resolution for deterministic pipeline alignment.	Use Scenario: SMPTE ST 2059-2–compliant broadcast infrastructure requiring traceable, low-jitter 27 MHz, 74.25 MHz, and 148.5 MHz video clocks. IC Role / Device Role / Timing Role: Precision clock synthesizer generating SMPTE-aligned frequencies from a 10 MHz GPS-disciplined reference with <0.7 ps RMS jitter. Use Value: Meets ITU-R BT.709 and SMPTE ST 2059-2 wander/jitter requirements without external jitter cleaners or reclockers.

Ethernet Switch/Router Timing

PCIe Gen 3/4 Host System Clocking

Use Scenario: High-port-count 1/10 GbE switches requiring synchronized clocks across PHYs, MACs, and packet processors.

IC Role / Device Role / Timing Role: Quad-output clock generator providing independent 125 MHz, 156.25 MHz, and 250 MHz clocks with sub-1 ps jitter to meet IEEE 802.3 and PCIe timing budgets.

Use Value: Eliminates four discrete oscillators; reduces board area by >60% while maintaining PCIe Gen 4 common clock jitter compliance (≤0.45 ps RMS).

Use Scenario: Server motherboard or add-in card with CPU, GPU, NVMe SSD, and PLX switch-all requiring tightly aligned reference clocks.

IC Role / Device Role / Timing Role: Single-chip source of PCIe Gen 3 SRNS-compliant 100 MHz and Gen 4-compliant 100 MHz clocks with independent spread-spectrum control per domain.

Use Value: Enables simultaneous PCIe root complex and endpoint clocking with guaranteed SRNS jitter margin and no inter-channel skew exceeding 100 ps.

FPGA and ASIC Clock Distribution

Broadcast Video Timing Synchronization

Use Scenario: Multi-FPGA systems (e.g., radar processing, AI inference accelerators) needing multiple high-frequency clocks with precise phase relationships.

IC Role / Device Role / Timing Role: Configurable quad generator delivering 300 MHz LVDS, 200 MHz HCSL, 100 MHz LVPECL, and 50 MHz CMOS from one device with programmable phase offsets.

Use Value: Replaces discrete clock trees and fanout buffers; achieves <20 ps inter-output phase step resolution for deterministic pipeline alignment.

Use Scenario: SMPTE ST 2059-2–compliant broadcast infrastructure requiring traceable, low-jitter 27 MHz, 74.25 MHz, and 148.5 MHz video clocks.

IC Role / Device Role / Timing Role: Precision clock synthesizer generating SMPTE-aligned frequencies from a 10 MHz GPS-disciplined reference with <0.7 ps RMS jitter.

Use Value: Meets ITU-R BT.709 and SMPTE ST 2059-2 wander/jitter requirements without external jitter cleaners or reclockers.

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-B05523-GM	Same silicon; factory-programmed with different default frequency configuration (50/100/125/156.25 MHz vs. B04523's 100/125/156.25/250 MHz)	Pre-configured for data center switch reference clocks rather than general-purpose FPGA/PCIe use	Select B05523-GM only if exact factory defaults match target system boot-time clock requirements without reprogramming.
LMK04832ISQE/NOPB	Two PLLs + 14 outputs; higher power (120 mA core), larger 64-QFN package; supports JESD204B deterministic latency	Targeted at RF/data converter timing; lacks PCIe Gen 4 common clock validation and spread-spectrum flexibility	Choose LMK04832 only when JESD204B subclass 1 synchronization or >4 outputs are required-otherwise SI5338A-B04523-GM offers superior jitter, size, and PCIe compliance.

Compared with Si5338A-B05523-GM, SI5338A-B04523-GM provides optimized default frequencies for PCIe/FPGA designs and avoids unnecessary reprogramming; versus LMK04832, it delivers lower jitter (0.7 vs. 1.1 ps RMS), smaller footprint (24-QFN vs. 64-QFN), and native PCIe Gen 4 common clock qualification-making it preferred for space-constrained, standards-compliant timing applications.

Availability

SI5338A-B04523-GM is available at Aetrix Electronics and suitable for Ethernet switch/router timing, PCIe Gen 3/4 host system clocking, and FPGA/ASIC clock distribution requiring stable component supply, long-term lifecycle assurance, and full traceability.

Supply support for SI5338A-B04523-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 highly flexible, low-jitter clock generator platform for replacing multiple fixed-frequency oscillators in networking, computing, and communications equipment-emphasizing programmability, PCIe compliance, and compact packaging.

FAQ

What is the primary function of the SI5338A-B04523-GM?

The SI5338A-B04523-GM is an I²C-programmable quad clock generator that synthesizes four independent, low-jitter output clocks from a single input reference. It replaces up to four discrete oscillators in applications like PCIe systems, Ethernet switches, and FPGA platforms-delivering frequencies from 0.16 to 710 MHz with 0.7 ps RMS typical phase jitter and full PCIe Gen 1–4 compliance. Its MultiSynth™ architecture ensures true zero-ppm accuracy on all outputs.

Does the SI5338A-B04523-GM support PCIe Gen 4 timing requirements?

Yes, the SI5338A-B04523-GM is validated for PCIe Gen 4 common clock operation with ≤0.45 ps RMS jitter (12 kHz–20 MHz), meeting the PCI-SIG Base Specification 4.0 rev. 0.5 requirement. It achieves this using its high-performance MultiSynth™ PLL architecture, low-noise VCO design, and optimized output drivers-confirmed via Skyworks' PCIe Clock Jitter Tool and Intel Clock Jitter Tool measurements at 100 MHz HCSL output.

Can the SI5338A-B04523-GM generate different output formats simultaneously?

Yes, the SI5338A-B04523-GM supports simultaneous LVPECL, LVDS, HCSL, CMOS, SSTL, and HSTL outputs across its four channels. Each output pair (CLK0A/B through CLK3A/B) is independently configurable for format, frequency, voltage (1.5/1.8/2.5/3.3 V), and termination-enabling direct interfacing with mixed-voltage FPGAs, CPUs, PHYs, and memory controllers without level-shifting components.

How is the SI5338A-B04523-GM programmed and configured?

The SI5338A-B04523-GM is programmed via its I²C/SMBus-compatible serial interface (SCL/SDA pins) using Skyworks' ClockBuilder Pro software. This GUI tool enables full register configuration-including input selection, MultiSynth™ dividers, output format/voltage, spread-spectrum settings, and phase offsets-and generates custom configuration files for one-time OTP programming or runtime I²C writes. Factory-programmed units (like SI5338A-B04523-GM) ship with preloaded settings but remain fully reprogrammable.

What package type and thermal characteristics does the SI5338A-B04523-GM have?

The SI5338A-B04523-GM uses a 24-pin QFN package measuring 4 × 4 mm with 0.5 mm pitch and an exposed thermal pad. Its thermal resistance is θJA = 37 °C/W (still air) and θJC = 10 °C/W, enabling reliable operation at full load across –40 to +85 °C ambient. The package is RoHS-compliant and compatible with standard reflow profiles, including JEDEC J-STD-020 peak temperature of 260 °C.

SI5338A-B04523-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)

SI5338A-B04523-GM FAQ

1.How can I place an order for SI5338A-B04523-GM through Aetrix?

Please submit a Request for Quotation (RFQ) for SI5338A-B04523-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 SI5338A-B04523-GM reliable?

The price and inventory of SI5338A-B04523-GM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI5338A-B04523-GM is usually 5 days.

3.What payment methods are accepted for SI5338A-B04523-GM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI5338A-B04523-GM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI5338A-B04523-GM?

SI5338A-B04523-GM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI5338A-B04523-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 SI5338A-B04523-GM?

For technical support, including SI5338A-B04523-GM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI5338A-B04523-GM requirements.

6.How does Aetrix verify that SI5338A-B04523-GM is sourced from the original manufacturer or authorized distributors?

All SI5338A-B04523-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 SI5338A-B04523-GM meets industry standards.

7.What is the process for return or replacement of SI5338A-B04523-GM?

All SI5338A-B04523-GM units undergo pre-shipment inspection (PSI). If there is an issue with SI5338A-B04523-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 SI5338A-B04523-GM part is unused and in its original packaging.

Return procedure for SI5338A-B04523-GM:

1.Submit a request within 90 days.

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

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