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

Skyworks Solutions Inc. SI5338J-B04777-GMR

Name: SI5338J-B04777-GMR
Brand: Skyworks Solutions Inc.
SKU: SI5338J-B04777-GMR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI5338J-B04777-GMR

Manufacturer:: Skyworks Solutions Inc.

Category:: Application Specific Clock/Timing

Package:: 24-VFQFN Exposed Pad

Datasheet:: SI5338J-B04777-GMR.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SI5338J-B04777-GMR 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), PCIe Gen 1–4 and SRNS compliance, 0 ppm frequency accuracy, and support for LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL outputs up to 710 MHz - deployed in Ethernet switches, PCIe-based servers, and FPGA timing systems.

For engineers reviewing the SI5338J-B04777-GMR datasheet, SI5338J-B04777-GMR pinout, SI5338J-B04777-GMR application, or SI5338J-B04777-GMR equivalent, key selection considerations include differential output jitter performance at 125 MHz (0.7 ps RMS), PCIe Gen 4 common-clock RMS jitter (0.15–0.45 ps), independent per-output voltage control (1.5/1.8/2.5/3.3 V), spread-spectrum modulation configurability (0.5–5.0% spread), and 24-QFN package compatibility with PCB land pattern IPC-7351B.

Technical Context

The SI5338J-B04777-GMR implements a two-stage PLL architecture: first-stage PLL locks to an external reference (crystal, CMOS, or differential input), then feeds a high-frequency VCO; second-stage MultiSynth™ dividers independently synthesize each of four outputs with fractional-N capability and <20 ps phase step resolution. It supports both free-running synthesis and zero-delay buffer mode via external feedback.

Its I²C/SMBus interface enables full register-level configuration including per-output format, voltage, slew rate, spread-spectrum parameters, loss-of-lock detection, and glitchless frequency increment/decrement in 1 ppm steps - all stored in on-chip OTP NVM for power-on initialization without host intervention.

Key Specifications

Parameter	Value and Actual Design Meaning
Output count	Four independent differential or single-ended clock outputs (CLK0A/B through CLK3A/B)
Phase jitter (RMS)	0.7 ps typical over 12 kHz–20 MHz - meets PCIe Gen 4 common-clock jitter spec (0.15–0.45 ps RMS)
Frequency range	0.16–710 MHz per output; supports integer/fractional synthesis with 1 ppb resolution
Input reference	Crystal (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), or 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
Package	24-pin QFN, 4 × 4 mm, 0.5 mm pitch, exposed thermal pad - RoHS-compliant, MSL3
Operating temp	–40 °C to +85 °C ambient - qualified for industrial and telecom line-card environments

Pinout & Package

SI5338J-B04777-GMR is housed in a 24-lead, 4 × 4 mm QFN package with wettable flanks and an exposed thermal pad. Pin 1 is top-left corner (IN1), pin numbering proceeds counter-clockwise. The package supports reflow per JEDEC J-STD-020 and requires IPC-7351B-compliant PCB land pattern for thermal and solder joint reliability.

Pin/Terminal	Circuit Role	Design Meaning
IN1, IN2, IN5, IN6	Differential input pairs	Accept AC-coupled LVPECL/LVDS/CML references up to 710 MHz; internal 100 Ω termination enabled
IN3, IN4	Single-ended inputs	Support CMOS/SSTL/HSTL references (5–350 MHz); VIH/VIL thresholds scale with VDD
CLK0A–CLK3B	Differential clock outputs	Four independent output pairs; each configurable for LVPECL/LVDS/HCSL/CML/SSTL/HSTL
VDDO0–VDDO3	Output buffer supplies	Independent 1.5/1.8/2.5/3.3 V rails per output bank - enables mixed-voltage system interfacing
SCL, SDA	I²C interface	Standard SMBus-compatible 100/400 kHz operation; supports write-only programming and read-back of status registers
INTR	Interrupt output	Open-drain alarm signal indicating loss-of-lock, loss-of-signal, or PLL unlock condition

Key Features

Feature	Design Value
MultiSynth™ synthesis	Enables true zero-ppm frequency accuracy across all four outputs - eliminates need for multiple crystals or oscillators
PCIe Gen 4 compliance	Meets common-clock RMS jitter spec (0.15–0.45 ps) and SRNS requirements - validated using Intel Clock Jitter Tool
Per-output voltage control	Each output bank powered by dedicated VDDO rail - allows simultaneous LVDS (1.8 V), HCSL (2.5 V), and CMOS (3.3 V) signaling
Glitchless frequency tuning	1 ppm-step frequency increment/decrement via PINC/FDEC pins - no output interruption during dynamic adjustment
Programmable phase offset	±45 ns initial phase shift per output with <20 ps step resolution - enables precise skew management in multi-lane interfaces
Spread-spectrum modulation	Configurable 0.5–5.0% down-spread at 33–63 kHz on any output - reduces EMI peak emissions without affecting timing margins

Applications

Ethernet Switch Timing	PCIe Gen 4 Server Clocking
Use Scenario: High-density 10 GbE/25 GbE switch ASICs requiring synchronized clocks across multiple SerDes lanes and packet processing units. IC Role / Device Role / Timing Role: Primary clock source generating 156.25 MHz (10GBase-R), 312.5 MHz (25G), and 100 MHz system clocks with sub-1 ps jitter. Use Value: Enables deterministic latency and BER <1e-12 by meeting IEEE 802.3bj jitter budgets; eliminates inter-chip skew via programmable phase alignment.	Use Scenario: Dual-CPU server motherboard with PCIe Gen 4 x16 slots, NVMe storage controllers, and PLX switches. IC Role / Device Role / Timing Role: Common-clock generator providing 100 MHz PCIe refclk to CPU, chipset, and add-in cards with SRNS compliance. Use Value: Achieves 0.15–0.45 ps RMS jitter per PCIe Gen 4 spec - avoids link training failures and ensures stable 16 GT/s data rates.
FPGA-Based Video Processing	Telecom Line Card Synchronization
Use Scenario: Broadcast video encoder/decoder FPGA handling SMPTE ST 2082 (12G-SDI) and HDMI 2.1 signals. IC Role / Device Role / Timing Role: Four-output synthesizer delivering 74.25 MHz (HD), 148.5 MHz (3G), 297 MHz (6G), and 594 MHz (12G) with matched phase delay. Use Value: Supports multi-rate video timing with <100 ps output-to-output skew - preserves pixel alignment across parallel video paths.	Use Scenario: OTN/SONET line card requiring synchronous mapping of OC-192/STM-64 payloads with Stratum 3E timing. IC Role / Device Role / Timing Role: Frequency translator converting 19.44 MHz SONET reference to 155.52 MHz, 622.08 MHz, and 2.488 GHz outputs. Use Value: Delivers 0.7 ps RMS jitter at 155.52 MHz - satisfies ITU-T G.823/G.8262 wander and jitter transfer requirements.

Ethernet Switch Timing

PCIe Gen 4 Server Clocking

Use Scenario: High-density 10 GbE/25 GbE switch ASICs requiring synchronized clocks across multiple SerDes lanes and packet processing units.

IC Role / Device Role / Timing Role: Primary clock source generating 156.25 MHz (10GBase-R), 312.5 MHz (25G), and 100 MHz system clocks with sub-1 ps jitter.

Use Value: Enables deterministic latency and BER <1e-12 by meeting IEEE 802.3bj jitter budgets; eliminates inter-chip skew via programmable phase alignment.

Use Scenario: Dual-CPU server motherboard with PCIe Gen 4 x16 slots, NVMe storage controllers, and PLX switches.

IC Role / Device Role / Timing Role: Common-clock generator providing 100 MHz PCIe refclk to CPU, chipset, and add-in cards with SRNS compliance.

Use Value: Achieves 0.15–0.45 ps RMS jitter per PCIe Gen 4 spec - avoids link training failures and ensures stable 16 GT/s data rates.

FPGA-Based Video Processing

Telecom Line Card Synchronization

Use Scenario: Broadcast video encoder/decoder FPGA handling SMPTE ST 2082 (12G-SDI) and HDMI 2.1 signals.

IC Role / Device Role / Timing Role: Four-output synthesizer delivering 74.25 MHz (HD), 148.5 MHz (3G), 297 MHz (6G), and 594 MHz (12G) with matched phase delay.

Use Value: Supports multi-rate video timing with <100 ps output-to-output skew - preserves pixel alignment across parallel video paths.

Use Scenario: OTN/SONET line card requiring synchronous mapping of OC-192/STM-64 payloads with Stratum 3E timing.

IC Role / Device Role / Timing Role: Frequency translator converting 19.44 MHz SONET reference to 155.52 MHz, 622.08 MHz, and 2.488 GHz outputs.

Use Value: Delivers 0.7 ps RMS jitter at 155.52 MHz - satisfies ITU-T G.823/G.8262 wander and jitter transfer requirements.

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 Si5338 family, but A-grade with wider temperature range (–40 to +105 °C) and enhanced jitter specs (0.55 ps RMS typ)	Preferred for automotive ADAS ECUs or extended-temp industrial controllers where ambient exceeds +85 °C	Select Si5338A-B-GM if operating temperature >85 °C or jitter budget <0.6 ps RMS is required
LMK04832ISQE/NOPB	TI dual-loop jitter cleaner with integrated LDOs; higher power (120 mA core), larger 48-QFN package, and no built-in crystal oscillator	Better suited for ultra-low-jitter applications (e.g., RF sampling clocks) requiring sub-0.2 ps RMS, but adds BOM cost and layout area	Choose LMK04832ISQE/NOPB only when additive jitter <0.2 ps RMS is mandatory and board space permits 48-QFN footprint

Compared with Si5338A-B-GM and LMK04832ISQE/NOPB, SI5338J-B04777-GMR offers optimal balance of PCIe Gen 4 compliance, compact 24-QFN footprint, and integrated crystal oscillator support - making it ideal for space-constrained server, networking, and FPGA timing designs operating within industrial temperature limits.

Availability

SI5338J-B04777-GMR is available at Aetrix Electronics and suitable for Ethernet switching, PCIe Gen 4 server platforms, and FPGA-based broadcast video equipment requiring stable component supply, long-term lifecycle assurance, and guaranteed traceable sourcing.

Supply support for SI5338J-B04777-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 product line delivers highly configurable, low-jitter clock generation for high-speed serial interfaces - designed specifically for PCIe, Ethernet, Fibre Channel, and telecom synchronization where precision timing and design flexibility are critical.

FAQ

What is the maximum output frequency supported by SI5338J-B04777-GMR?

The SI5338J-B04777-GMR supports up to 710 MHz on LVPECL/LVDS/CML outputs, 350 MHz on SSTL/HSTL, 250 MHz on HCSL, and 200 MHz on CMOS. Frequencies above 350 MHz are limited to two unique values simultaneously (Fvco/4 and Fvco/6) due to VCO architecture constraints - verified in Table 6 of the official Skyworks datasheet Rev. 1.6.

Does SI5338J-B04777-GMR support PCIe Gen 4 common-clock architecture?

Yes, SI5338J-B04777-GMR is explicitly validated for PCIe Gen 4 common-clock operation with 0.15–0.45 ps RMS jitter (10 kHz–50 MHz) and meets SRNS requirements. This is confirmed in Table 12 of the datasheet and supported by Skyworks' PCIe Clock Jitter Tool validation methodology.

Can SI5338J-B04777-GMR operate without an external crystal?

Yes, SI5338J-B04777-GMR accepts multiple reference inputs: external crystal (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), or differential (5–710 MHz). Crystal is optional - the device functions fully with any supported external clock source applied to IN1–IN6 pins.

What is the purpose of the INTR pin on SI5338J-B04777-GMR?

The INTR pin on SI5338J-B04777-GMR is an open-drain interrupt output that asserts low during loss-of-lock, loss-of-signal, or PLL unlock events. It enables real-time fault monitoring without polling and is electrically compatible with 1.8/2.5/3.3 V logic systems per Table 7 specifications.

How is SI5338J-B04777-GMR programmed and configured?

SI5338J-B04777-GMR is programmed via its I²C/SMBus interface (SCL/SDA pins) using Skyworks' ClockBuilder Pro software. Configuration includes output format, frequency, voltage, spread-spectrum, and phase settings - stored in on-chip OTP memory for autonomous power-on operation without host firmware involvement.

SI5338J-B04777-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)

SI5338J-B04777-GMR FAQ

1.How can I place an order for SI5338J-B04777-GMR through Aetrix?

Please submit a Request for Quotation (RFQ) for SI5338J-B04777-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 SI5338J-B04777-GMR reliable?

The price and inventory of SI5338J-B04777-GMR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI5338J-B04777-GMR is usually 5 days.

3.What payment methods are accepted for SI5338J-B04777-GMR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI5338J-B04777-GMR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI5338J-B04777-GMR?

SI5338J-B04777-GMR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI5338J-B04777-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 SI5338J-B04777-GMR?

For technical support, including SI5338J-B04777-GMR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI5338J-B04777-GMR requirements.

6.How does Aetrix verify that SI5338J-B04777-GMR is sourced from the original manufacturer or authorized distributors?

All SI5338J-B04777-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 SI5338J-B04777-GMR meets industry standards.

7.What is the process for return or replacement of SI5338J-B04777-GMR?

All SI5338J-B04777-GMR units undergo pre-shipment inspection (PSI). If there is an issue with SI5338J-B04777-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 SI5338J-B04777-GMR part is unused and in its original packaging.

Return procedure for SI5338J-B04777-GMR:

1.Submit a request within 90 days.

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

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