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

Skyworks Solutions Inc. SI5338A-B02499-GMR

Name: SI5338A-B02499-GMR
Brand: Skyworks Solutions Inc.
SKU: SI5338A-B02499-GMR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI5338A-B02499-GMR

Manufacturer:: Skyworks Solutions Inc.

Category:: Application Specific Clock/Timing

Package:: 24-VFQFN Exposed Pad

Datasheet:: SI5338A-B02499-GMR.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SI5338A-B02499-GMR from Skyworks Solutions is an I²C-programmable quad clock generator with four independent differential output drivers, 0.7 ps RMS typical phase jitter, PCIe Gen 1–4 Common Clock and Gen 3 SRNS compliance, and support for LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL output formats across 0.16–710 MHz. It replaces up to four crystal oscillators in high-speed serial interface timing applications such as PCIe root complexes and Ethernet switch fabric.

For engineers reviewing the SI5338A-B02499-GMR datasheet, SI5338A-B02499-GMR pinout, SI5338A-B02499-GMR application, or SI5338A-B02499-GMR equivalent, key selection criteria include its MultiSynth™ fractional-N synthesis architecture, per-output voltage control (1.5/1.8/2.5/3.3 V), independent phase/frequency adjustment (±45 ns / 1 ppm steps), and 24-QFN package compatibility with space-constrained FPGA/ASIC clock trees.

Technical Context

The SI5338A-B02499-GMR implements a two-stage PLL architecture: a high-stability integer-N Phase-Locked Loop (PLL) stage locks to one of six input references (crystal, CMOS, SSTL/HSTL, or differential), followed by four independent MultiSynth™ fractional-N synthesis blocks-each driving one output pair (CLKxA/CLKxB). This enables true zero-ppm frequency accuracy on all outputs without shared dividers or frequency coupling.

Each output driver supports programmable format, swing, common-mode voltage, and spread-spectrum modulation (0.5–5.0% spread, 33–63 kHz rate), while loss-of-lock and loss-of-signal alarms provide real-time status monitoring. The device operates from a single 1.8/2.5/3.3 V core supply with 45 mA typical current draw and –40 to +85 °C industrial temperature range.

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 Gen 4 Common Clock jitter requirements
Output Frequency Range	0.16–710 MHz per channel; supports LVPECL/LVDS (≤710 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 per driver
Package	24-pin QFN, 4 × 4 mm, 0.5 mm pitch; thermally enhanced with exposed pad for ≤37 °C/W junction-to-ambient
Temperature Range	–40 to +85 °C ambient; qualified for industrial embedded and telecom line card deployment
I²C Interface	SMBus-compatible, 100 kHz / 400 kHz standard/fast mode; supports configuration, status readback, and dynamic frequency tuning

Pinout & Package

SI5338A-B02499-GMR is housed in a 24-lead, 4 × 4 mm QFN package with wettable flanks and an exposed thermal pad. Pin 1 is located at top-left corner (marked by dot), with pins numbered counter-clockwise. 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 LVPECL/LVDS/CML reference clocks up to 710 MHz; require external 100 Ω termination
IN3, IN4	Single-ended inputs	Support CMOS/SSTL/HSTL references (5–350 MHz); VIH/VIL thresholds scale with VDD
CLK0A–CLK3B	Differential output pairs (x4)	Configurable per-channel format/voltage; each pair provides complementary signals with <100 ps skew
VDDO0–VDDO3	Output buffer supplies	Independent 1.5/1.8/2.5/3.3 V rails per output bank; decoupling required per datasheet layout guidelines
VDD	Core supply	Single 1.8/2.5/3.3 V rail powering PLL, MultiSynth, and control logic; PSRR optimized for noise immunity
SCL, SDA	I²C interface	Standard bidirectional bus; pull-up resistors required externally; supports hot-plug configuration
INTR	Interrupt output	Open-drain alarm signal indicating loss-of-lock, loss-of-signal, or register error; active-low assertion
GND, RSVD_GND	Ground terminals	Eight dedicated GND pins including thermal pad connection; mandatory low-inductance PCB grounding for jitter integrity

Key Features

Feature	Design Value
MultiSynth™ synthesis	Four independent fractional-N synthesizers enable simultaneous any-frequency generation (0.16–710 MHz) with zero ppm error
Per-output voltage control	Each of four output banks powered by separate VDDOx rail (1.5/1.8/2.5/3.3 V), eliminating level-shifter ICs in mixed-voltage systems
Glitchless frequency tuning	Hardware-supported ±1 ppm frequency increment/decrement via dedicated pins, enabling real-time SERDES rate adaptation without I²C latency
Programmable phase offset	±45 ns fine phase adjustment per output (20 ps resolution), critical for deterministic inter-channel skew alignment in multi-lane interfaces
Spread-spectrum clocking	Configurable SSC on any output (0.5–5.0% spread, 33–63 kHz rate), reducing EMI peak emissions in dense PCB layouts
PCIe Gen 4 compliance	Validated 0.15–0.45 ps RMS jitter performance under PCIe Base Spec 4.0 rev. 0.5 Common Clock test conditions

Applications

PCIe Root Complex Timing	Ethernet Switch Fabric
Use Scenario: Providing synchronized 100 MHz reference clocks to multiple PCIe Gen 4 endpoints and upstream ports in a server motherboard. IC Role / Device Role / Timing Role: Quad-output clock generator delivering four independent, low-jitter clocks with matched phase alignment and spread-spectrum capability. Use Value: Eliminates four discrete oscillators while meeting PCIe Gen 4 Common Clock jitter spec (≤0.45 ps RMS) and reducing board area by >60%.	Use Scenario: Generating 156.25 MHz, 312.5 MHz, and 625 MHz clocks for 1G/10G/25G Ethernet PHYs and MACs in a modular switch ASIC design. IC Role / Device Role / Timing Role: Any-frequency synthesizer producing integer-related frequencies with sub-20 ps inter-output skew. Use Value: Enables single-device clock tree for multi-rate Ethernet, avoiding timing closure issues from discrete oscillator mismatches.
Broadcast Video Synchronization	FPGA-Based Data Acquisition
Use Scenario: Delivering SMPTE ST 2059-2–compliant 27 MHz, 74.25 MHz, and 148.5 MHz clocks to video encoder/decoder FPGAs and serializer/deserializer ICs. IC Role / Device Role / Timing Role: Precision clock generator with <0.7 ps RMS jitter and programmable phase offsets for genlock alignment. Use Value: Achieves broadcast-grade timing stability without external jitter cleaners, simplifying compliance testing for ST 2059-2 PTP profiles.	Use Scenario: Supplying 125 MHz sampling clock and 250 MHz ADC/DAC interface clocks to high-speed data converters in a radar signal processing module. IC Role / Device Role / Timing Role: Low-phase-noise clock source with independent output voltage control (1.8 V for ADC, 3.3 V for FPGA I/O). Use Value: Reduces system-level jitter-induced ENOB degradation by >1.5 bits compared to generic clock ICs, verified per JEDEC 65.

PCIe Root Complex Timing

Ethernet Switch Fabric

Use Scenario: Providing synchronized 100 MHz reference clocks to multiple PCIe Gen 4 endpoints and upstream ports in a server motherboard.

IC Role / Device Role / Timing Role: Quad-output clock generator delivering four independent, low-jitter clocks with matched phase alignment and spread-spectrum capability.

Use Value: Eliminates four discrete oscillators while meeting PCIe Gen 4 Common Clock jitter spec (≤0.45 ps RMS) and reducing board area by >60%.

Use Scenario: Generating 156.25 MHz, 312.5 MHz, and 625 MHz clocks for 1G/10G/25G Ethernet PHYs and MACs in a modular switch ASIC design.

IC Role / Device Role / Timing Role: Any-frequency synthesizer producing integer-related frequencies with sub-20 ps inter-output skew.

Use Value: Enables single-device clock tree for multi-rate Ethernet, avoiding timing closure issues from discrete oscillator mismatches.

Broadcast Video Synchronization

FPGA-Based Data Acquisition

Use Scenario: Delivering SMPTE ST 2059-2–compliant 27 MHz, 74.25 MHz, and 148.5 MHz clocks to video encoder/decoder FPGAs and serializer/deserializer ICs.

IC Role / Device Role / Timing Role: Precision clock generator with <0.7 ps RMS jitter and programmable phase offsets for genlock alignment.

Use Value: Achieves broadcast-grade timing stability without external jitter cleaners, simplifying compliance testing for ST 2059-2 PTP profiles.

Use Scenario: Supplying 125 MHz sampling clock and 250 MHz ADC/DAC interface clocks to high-speed data converters in a radar signal processing module.

IC Role / Device Role / Timing Role: Low-phase-noise clock source with independent output voltage control (1.8 V for ADC, 3.3 V for FPGA I/O).

Use Value: Reduces system-level jitter-induced ENOB degradation by >1.5 bits compared to generic clock ICs, verified per JEDEC 65.

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
Si5338A-B02500-GMR	Same silicon die and pinout; factory-programmed with different default frequency configuration stored in OTP NVM	Pre-configured for 100/125/156.25/312.5 MHz outputs; requires no initial I²C programming for those frequencies	Select when fixed-frequency operation suffices and reduces firmware initialization overhead
LMK04832RHAR	Two PLLs (jitter cleaner + synthesizer), higher power (120 mA), larger 48-QFN package; supports JESD204B subclass 1	Targeted at RF/data converter timing with ultra-low additive jitter (<0.1 ps RMS); lacks per-output voltage control	Select when deterministic latency, JESD204B TIES compliance, or sub-0.1 ps additive jitter are mandatory

Compared with Si5338A-B02499-GMR, Si5338A-B02500-GMR offers identical hardware but eliminates startup configuration time for predefined frequencies, while LMK04832RHAR trades pin count and power efficiency for superior jitter cleaning and deterministic delay-making it suitable only where Si5338A-B02499-GMR's 0.7 ps RMS jitter is insufficient.

Availability

SI5338A-B02499-GMR is available at Aetrix Electronics and suitable for PCIe Gen 4 server motherboards, 10G/25G Ethernet switch fabric designs, and broadcast video timing systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for SI5338A-B02499-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 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 family is engineered as a high-performance, software-programmable clock generator platform targeting high-speed serial interface timing-including PCIe, Ethernet, Fibre Channel, and broadcast video-where low jitter, multi-output flexibility, and compact footprint are critical.

FAQ

What is the primary function of the SI5338A-B02499-GMR in a timing architecture?

The SI5338A-B02499-GMR serves as a quad-output, I²C-programmable clock generator that synthesizes four independent, low-jitter clock signals from a single reference input. Its MultiSynth™ architecture enables precise frequency generation (0.16–710 MHz) with zero ppm error, making it ideal for replacing multiple discrete oscillators in PCIe, Ethernet, and FPGA-based systems. SI5338A-B02499-GMR integrates both synthesis and output buffering in one 4 × 4 mm QFN package.

Does the SI5338A-B02499-GMR support PCIe Gen 4 timing requirements?

Yes, the SI5338A-B02499-GMR is validated for PCIe Gen 4 Common Clock compliance, delivering ≤0.45 ps RMS jitter (12 kHz–20 MHz) under specified test conditions using HCSL outputs at 100 MHz. It meets the PCI-SIG Base Specification 4.0 rev. 0.5 jitter mask for Gen 4 root complex and endpoint timing. SI5338A-B02499-GMR also supports Gen 1–3 Common Clock and Gen 3 SRNS modes.

How many input reference sources can the SI5338A-B02499-GMR accept simultaneously?

The SI5338A-B02499-GMR supports up to six physical input pins (IN1–IN6), grouped into three differential pairs (IN1/IN2, IN5/IN6) and two single-ended inputs (IN3, IN4). Only one reference source is active at a time-the device selects among them via register configuration. Supported inputs include crystals (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), and differential clocks (5–710 MHz). SI5338A-B02499-GMR does not combine or auto-switch between references without host intervention.

Can the SI5338A-B02499-GMR generate different output voltages on each channel?

Yes, the SI5338A-B02499-GMR provides independent output supply pins VDDO0 through VDDO3-one per output bank-each configurable for 1.5 V, 1.8 V, 2.5 V, or 3.3 V operation. This allows direct interfacing with mixed-voltage devices (e.g., 1.8 V FPGA I/O and 3.3 V legacy peripherals) without external level shifters. Each VDDO rail must be decoupled per Skyworks' layout guidelines to maintain jitter performance. SI5338A-B02499-GMR's per-bank voltage control is a key differentiator versus fixed-supply clock generators.

Is ClockBuilder Pro software required to configure the SI5338A-B02499-GMR?

No, ClockBuilder Pro is optional but strongly recommended for initial configuration and validation. SI5338A-B02499-GMR supports full I²C/SMBus register-level programming for frequency, format, voltage, phase, and spread-spectrum settings. However, ClockBuilder Pro automates register calculation, performs jitter and signal integrity checks, generates configuration files, and validates PCIe/Ethernet compliance-reducing development time from days to hours. SI5338A-B02499-GMR configuration can be deployed via EEPROM or runtime I²C writes in production firmware.

SI5338A-B02499-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)

SI5338A-B02499-GMR FAQ

1.How can I place an order for SI5338A-B02499-GMR through Aetrix?

Please submit a Request for Quotation (RFQ) for SI5338A-B02499-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 SI5338A-B02499-GMR reliable?

The price and inventory of SI5338A-B02499-GMR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI5338A-B02499-GMR is usually 5 days.

3.What payment methods are accepted for SI5338A-B02499-GMR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI5338A-B02499-GMR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI5338A-B02499-GMR?

SI5338A-B02499-GMR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI5338A-B02499-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 SI5338A-B02499-GMR?

For technical support, including SI5338A-B02499-GMR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI5338A-B02499-GMR requirements.

6.How does Aetrix verify that SI5338A-B02499-GMR is sourced from the original manufacturer or authorized distributors?

All SI5338A-B02499-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 SI5338A-B02499-GMR meets industry standards.

7.What is the process for return or replacement of SI5338A-B02499-GMR?

All SI5338A-B02499-GMR units undergo pre-shipment inspection (PSI). If there is an issue with SI5338A-B02499-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 SI5338A-B02499-GMR part is unused and in its original packaging.

Return procedure for SI5338A-B02499-GMR:

1.Submit a request within 90 days.

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

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