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

Skyworks Solutions Inc. SI5338A-B01449-GM

Name: SI5338A-B01449-GM
Brand: Skyworks Solutions Inc.
SKU: SI5338A-B01449-GM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI5338A-B01449-GM

Manufacturer:: Skyworks Solutions Inc.

Category:: Application Specific Clock/Timing

Package:: 24-VFQFN Exposed Pad

Datasheet:: SI5338A-B01449-GM.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SI5338A-B01449-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, and FPGA clocking systems.

For engineers reviewing the SI5338A-B01449-GM datasheet, SI5338A-B01449-GM pinout, SI5338A-B01449-GM application, or SI5338A-B01449-GM equivalent, key selection criteria include output format flexibility (LVPECL/LVDS/HCSL/CMOS/SSTL), independent per-output voltage (1.5–3.3 V), any-frequency synthesis (0.16–710 MHz), spread-spectrum control (0.5–5.0% at 33–63 kHz), and glitchless frequency adjustment in 1 ppm steps.

Technical Context

The SI5338A-B01449-GM implements a two-stage PLL architecture: a high-stability reference stage (with crystal or external clock input) followed by four independent MultiSynth™ fractional-N synthesis blocks, each driving a configurable output buffer. Its core operates from a single 1.8/2.5/3.3 V supply with 45 mA typical current draw.

Each output supports independent signal format selection, voltage rail assignment (VDDO0–VDDO3), programmable phase offset (±45 ns, <20 ps step), and spread-spectrum modulation. Input options include differential (5–710 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), or 8–30 MHz crystal.

Key Specifications

Parameter	Value and Actual Design Meaning
Phase Jitter (RMS)	0.7 ps typical (12 kHz–20 MHz); meets PCIe Gen 3 SRNS & Gen 4 common clock specs
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 Options	8–30 MHz crystal, or AC/DC-coupled external clock: 5–710 MHz differential, 5–200 MHz CMOS, 5–350 MHz SSTL/HSTL
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
Temperature Range	–40 to +85 °C ambient; qualified for industrial and telecom line card deployment
Package	24-pin QFN, 4 × 4 mm, 0.5 mm pitch; RoHS-compliant, lead-free, halogen-free
Interface	I²C/SMBus-compatible serial interface (SCL/SDA); supports ClockBuilder Pro configuration

Pinout & Package

SI5338A-B01449-GM uses a 24-lead QFN package (4 × 4 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments are fixed per the Si5338 family: IN1/IN2 (differential ref 1), IN3/IN4 (single-ended ref 2/3), IN5/IN6 (differential ref 4/5), CLK0A/CLK0B through CLK3A/CLK3B (four differential output pairs), VDDO0–VDDO3 (independent output supply rails), VDD (core supply), SCL/SDA/INTR (I²C control and interrupt), and GND/RSVD_GND.

Pin/Terminal	Circuit Role	Design Meaning
IN1, IN2	Differential reference input 1	Accepts 5–710 MHz AC-coupled differential clock; internal 100 Ω termination enabled
IN3, IN4	Single-ended reference inputs	Support CMOS/SSTL/HSTL clocks (5–350 MHz); each configurable as independent input source
IN5, IN6	Differential reference input 2	Second 5–710 MHz differential input path; enables dual-reference redundancy or frequency translation
CLK0A, CLK0B – CLK3A, CLK3B	Differential output pairs	Four independent outputs; each configurable as LVPECL, LVDS, HCSL, CML, or SSTL with per-output VDDO
VDDO0 – VDDO3	Output buffer supply rails	Independent 1.5/1.8/2.5/3.3 V supplies per output pair; enables mixed-voltage system interfacing
VDD	Core supply	Single 1.8/2.5/3.3 V supply powers PLL, MultiSynth, and logic; PSRR optimized for noise immunity
SCL, SDA	I²C interface	Standard SMBus-compatible 100/400 kHz interface; supports ClockBuilder Pro programming and runtime reconfiguration
INTR	Interrupt output	Open-drain status indicator for loss-of-lock (LOL) and loss-of-signal (LOS) events

Key Features

Feature	Design Value
MultiSynth™ fractional-N synthesis	Enables true zero-ppm frequency accuracy on all four outputs simultaneously, with resolution down to 1 ppb
Independent output voltage per driver	Eliminates level-shifting components when interfacing with mixed-voltage FPGAs, ASICs, or SerDes PHYs
Glitchless frequency increment/decrement	Adjusts output frequency in precise 1 ppm steps without cycle slips or phase discontinuities-critical for dynamic rate adaptation
Programmable phase offset	±45 ns range with <20 ps step size enables fine-grained skew alignment across multi-lane interfaces (e.g., PCIe, DDR)
Spread-spectrum modulation	Configurable on any output: 0.5–5.0% spread depth, 33–63 kHz modulation rate-reduces EMI without affecting timing margin

Applications

PCIe Gen 1–4 Clocking	Ethernet Switch/Routing
Use Scenario: Providing synchronized reference clocks to multiple PCIe root complexes and endpoints in server backplanes or AI accelerators. IC Role / Device Role / Timing Role: Quad-output clock generator delivering Gen 3 SRNS-compliant and Gen 4 common-clock signals with sub-0.32 ps RMS jitter. Use Value: Eliminates need for four discrete oscillators while meeting stringent PCIe jitter masks and enabling scalable lane-count expansion.	Use Scenario: Generating low-jitter clocks for 1 GbE/10 GbE PHYs, packet processors, and switch fabric controllers in enterprise routers. IC Role / Device Role / Timing Role: Configurable clock source supporting multiple standards (IEEE 802.3, ITU-T G.8262) with selectable output formats and voltages. Use Value: Reduces BOM count and layout complexity while maintaining deterministic latency and jitter performance across heterogeneous PHY interfaces.
FPGA & Processor Clocking	Broadcast Video/Audio Timing
Use Scenario: Supplying independent, phase-aligned clocks to FPGA I/O banks, transceivers, and hard processor subsystems in broadcast infrastructure or test equipment. IC Role / Device Role / Timing Role: Programmable quad clock generator with per-output phase control and format flexibility (LVDS, HCSL, CMOS). Use Value: Enables precise clock domain crossing and eliminates external delay lines or PLLs for multi-clock-domain SoC integration.	Use Scenario: Delivering SMPTE-compliant timing references (e.g., 27 MHz, 74.25 MHz, 148.5 MHz) to video encoders, decoders, and genlock circuits in studio production gear. IC Role / Device Role / Timing Role: Any-frequency synthesizer with ultra-low jitter (<1 ps RMS) and stable temperature drift over –40 to +85 °C. Use Value: Ensures frame-accurate synchronization and prevents lip-sync errors or video artifacts in real-time broadcast chains.

PCIe Gen 1–4 Clocking

Ethernet Switch/Routing

Use Scenario: Providing synchronized reference clocks to multiple PCIe root complexes and endpoints in server backplanes or AI accelerators.

IC Role / Device Role / Timing Role: Quad-output clock generator delivering Gen 3 SRNS-compliant and Gen 4 common-clock signals with sub-0.32 ps RMS jitter.

Use Value: Eliminates need for four discrete oscillators while meeting stringent PCIe jitter masks and enabling scalable lane-count expansion.

Use Scenario: Generating low-jitter clocks for 1 GbE/10 GbE PHYs, packet processors, and switch fabric controllers in enterprise routers.

IC Role / Device Role / Timing Role: Configurable clock source supporting multiple standards (IEEE 802.3, ITU-T G.8262) with selectable output formats and voltages.

Use Value: Reduces BOM count and layout complexity while maintaining deterministic latency and jitter performance across heterogeneous PHY interfaces.

FPGA & Processor Clocking

Broadcast Video/Audio Timing

Use Scenario: Supplying independent, phase-aligned clocks to FPGA I/O banks, transceivers, and hard processor subsystems in broadcast infrastructure or test equipment.

IC Role / Device Role / Timing Role: Programmable quad clock generator with per-output phase control and format flexibility (LVDS, HCSL, CMOS).

Use Value: Enables precise clock domain crossing and eliminates external delay lines or PLLs for multi-clock-domain SoC integration.

Use Scenario: Delivering SMPTE-compliant timing references (e.g., 27 MHz, 74.25 MHz, 148.5 MHz) to video encoders, decoders, and genlock circuits in studio production gear.

IC Role / Device Role / Timing Role: Any-frequency synthesizer with ultra-low jitter (<1 ps RMS) and stable temperature drift over –40 to +85 °C.

Use Value: Ensures frame-accurate synchronization and prevents lip-sync errors or video artifacts in real-time broadcast chains.

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-B01450-GM	Same silicon, factory-programmed with different default configuration (e.g., output frequencies, formats, or spread-spectrum settings)	Pre-configured for alternate reference input or output topology; requires no field programming for that specific use case	Select when pre-loaded firmware matches target system clock tree without customization
LMK04832RHAT	Two PLLs (not four independent MultiSynths); higher power (120 mA typ), larger 48-QFN package; supports JESD204B deterministic latency	Targeted at high-speed data converter timing (JESD204B), not PCIe or Ethernet; lacks per-output voltage control and flexible SSC	Choose only if JESD204B deterministic latency or dual-loop redundancy is required over multi-format flexibility

Compared with SI5338A-B01449-GM, Si5338A-B01450-GM offers identical hardware capability but reduced engineering effort for a fixed configuration, whereas LMK04832RHAT trades output flexibility and power efficiency for specialized JESD204B support and tighter inter-device skew control.

Availability

SI5338A-B01449-GM is available at Aetrix Electronics and suitable for PCIe Gen 4 server backplanes, 10 GbE routing platforms, and FPGA-based broadcast video systems requiring stable component supply, long-term lifecycle assurance, and full traceability.

Supply support for SI5338A-B01449-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 leader in analog and mixed-signal semiconductors, specializing in RF, timing, and connectivity solutions for infrastructure, automotive, and mobile markets.

The Si5338 product line delivers programmable, low-jitter clock generation for high-speed digital systems-including PCIe, Ethernet, and broadcast video-where precise frequency synthesis and flexible output formatting are critical.

FAQ

What is the maximum output frequency supported by SI5338A-B01449-GM in LVPECL mode?

The SI5338A-B01449-GM supports LVPECL output up to 710 MHz. This capability is validated per Table 6 of the datasheet and applies when using differential outputs with appropriate termination. Frequencies above 350 MHz require careful attention to VCO division ratios (Fvco/4 or Fvco/6) and layout to maintain jitter performance below 1 ps RMS.

Does SI5338A-B01449-GM support PCIe Gen 4 Common Clock compliance?

Yes, SI5338A-B01449-GM meets PCIe Gen 4 Common Clock RMS jitter requirements (0.15–0.45 ps RMS, 10 kHz–50 MHz) when configured per Skyworks' recommended settings-including PLL bandwidth of 2–5 MHz and proper input reference selection. Validation is documented in Table 12 and AN562.

Can SI5338A-B01449-GM generate four different output frequencies simultaneously?

Yes, SI5338A-B01449-GM uses four independent MultiSynth™ engines to synthesize four distinct frequencies simultaneously-from 0.16 MHz to 710 MHz-with zero ppm error. Each output is fully programmable via I²C, and frequencies may be integer- or fractional-related without mutual interference.

What reference inputs does SI5338A-B01449-GM accept?

SI5338A-B01449-GM accepts up to six reference inputs: two differential pairs (IN1/IN2, IN5/IN6) supporting 5–710 MHz; two single-ended inputs (IN3, IN4) supporting CMOS/SSTL/HSTL at 5–350 MHz; and an on-chip oscillator for 8–30 MHz crystals. All inputs are selectable per output path in the configuration.

Is ClockBuilder Pro software required to configure SI5338A-B01449-GM?

No, ClockBuilder Pro is optional but strongly recommended for SI5338A-B01449-GM configuration. The device supports full I²C register-level programming; however, ClockBuilder Pro automates MultiSynth divider calculations, jitter optimization, and validation against PCIe/Ethernet standards-reducing configuration time from hours to minutes.

SI5338A-B01449-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-B01449-GM FAQ

1.How can I place an order for SI5338A-B01449-GM through Aetrix?

Please submit a Request for Quotation (RFQ) for SI5338A-B01449-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-B01449-GM reliable?

The price and inventory of SI5338A-B01449-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-B01449-GM is usually 5 days.

3.What payment methods are accepted for SI5338A-B01449-GM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI5338A-B01449-GM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI5338A-B01449-GM?

SI5338A-B01449-GM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI5338A-B01449-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-B01449-GM?

For technical support, including SI5338A-B01449-GM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI5338A-B01449-GM requirements.

6.How does Aetrix verify that SI5338A-B01449-GM is sourced from the original manufacturer or authorized distributors?

All SI5338A-B01449-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-B01449-GM meets industry standards.

7.What is the process for return or replacement of SI5338A-B01449-GM?

All SI5338A-B01449-GM units undergo pre-shipment inspection (PSI). If there is an issue with SI5338A-B01449-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-B01449-GM part is unused and in its original packaging.

Return procedure for SI5338A-B01449-GM:

1.Submit a request within 90 days.

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

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