Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Skyworks Solutions Inc. SI5338B-B04327-GMR

Name: SI5338B-B04327-GMR
Brand: Skyworks Solutions Inc.
SKU: SI5338B-B04327-GMR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: SI5338B-B04327-GMR

Manufacturer:: Skyworks Solutions Inc.

Category:: Application Specific Clock/Timing

Package:: 24-VFQFN Exposed Pad

Datasheet:: SI5338B-B04327-GMR.pdf

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

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,978

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

SI5338B-B04327-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.

For engineers reviewing the SI5338B-B04327-GMR datasheet, SI5338B-B04327-GMR pinout, SI5338B-B04327-GMR application, or SI5338B-B04327-GMR equivalent, key selection criteria include its MultiSynth™ fractional-N synthesis architecture, independent per-output voltage (1.5/1.8/2.5/3.3 V), ±20 ps phase step resolution, and 4×4 mm 24-QFN package with 24-pin I²C/SMBus control interface.

Technical Context

The SI5338B-B04327-GMR 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 one output pair. Each MultiSynth supports integer or fractional frequency synthesis with <1 ppb resolution and programmable initial phase offset (±45 ns).

It features fully independent output configuration - including format, supply voltage (VDDO0–VDDO3), spread-spectrum modulation (0.5–5.0% spread, 33–63 kHz rate), and glitchless frequency increment/decrement (1 ppm steps) - enabling precise timing coordination across heterogeneous subsystems such as PCIe root complex, Ethernet PHY, and FPGA fabric clocks.

Key Specifications

Parameter	Value and Actual Design Meaning
Phase Jitter (RMS)	0.7 ps - meets PCIe Gen 4 common clock TJ spec and enables low-bit-error-rate serial link operation
Output Frequency Range	0.16–710 MHz - covers PCIe 100 MHz, 125 MHz GbE, 156.25 MHz SerDes, and 312.5 MHz 10GbE reference clocks
Synthesis Resolution	1 ppb - enables exact frequency generation without rounding error (e.g., 156.250000 MHz, not 156.250001)
Input Flexibility	Crystal (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), differential (5–710 MHz) - eliminates need for external buffer or level translator
Supply Voltages	VDD = 1.8/2.5/3.3 V; VDDOx = 1.5/1.8/2.5/3.3 V - supports mixed-voltage system clocking with independent IO domain control
Operating Temperature	–40 to +85 °C - qualified for industrial and telecom line card environments
Package	24-pin QFN, 4 × 4 mm - surface-mount compatible with high-density PCB layouts and thermal management via exposed pad

Pinout & Package

The SI5338B-B04327-GMR is housed in a 4 × 4 mm, 24-lead QFN package with wettable flanks and an exposed thermal pad. Pin 1 is located at top-left corner (marked dot); pin numbering proceeds counterclockwise.

Pin/Terminal	Circuit Role	Design Meaning
IN1, IN2, IN5, IN6	Differential input pairs	Accept AC-coupled LVDS/LVPECL/CML reference clocks up to 710 MHz; internal 100 Ω termination enabled
IN3, IN4	Single-ended CMOS/SSTL/HSTL inputs	Support DC-coupled 5–350 MHz clocks; VIH/VIL thresholds scale with VDD; 20 kΩ pull-up/pull-down configurable
CLK0A/CLK0B – CLK3A/CLK3B	Differential output pairs	Four independent LVPECL/LVDS/HCSL/CML outputs; each pair shares VDDOx supply and format setting
VDDO0–VDDO3	Output driver supplies	Independent 1.5/1.8/2.5/3.3 V rails per output bank - enables mixed-signal SoC interfacing without level shifters
VDD	Core supply	Single 1.8/2.5/3.3 V core rail; PSRR > 60 dB suppresses power noise coupling into jitter
SCL, SDA	I²C/SMBus interface	Standard 100/400 kHz operation; supports multi-drop bus; 4 kΩ pull-up required externally
INTR	Interrupt output	Open-drain status flag for loss-of-lock (LOL) and loss-of-signal (LOS); active-low, 3 mA sink capability
RSVD_GND	Reserved ground	Internal no-connect; must be tied to GND for mechanical stability and EMI control

Key Features

Feature	Design Value
MultiSynth™ synthesis	Four independent fractional-N synthesizers enable simultaneous generation of unrelated frequencies (e.g., 100 MHz PCIe + 125 MHz Ethernet + 156.25 MHz SerDes + 312.5 MHz 10GbE)
PCIe Gen 3 SRNS compliance	Validated sub-0.32 ps RMS jitter under Separate Reference No Spread conditions - meets Intel CRB requirements for endpoint timing
Per-output spread spectrum	Configurable SSC on any output (5–350 MHz, 0.5–5.0% spread, 33–63 kHz rate) reduces EMI peak emissions without affecting system timing margins
Glitchless frequency tuning	Hardware-supported ±1 ppm frequency increment/decrement with 667 ns update time - enables dynamic clock scaling during runtime
Programmable phase offset	±45 ns adjustment in <20 ps steps per output - allows deterministic skew compensation between parallel data lanes (e.g., DDR, PCIe)

Applications

PCIe Gen 4 Root Complex Timing	Ethernet Switch Fabric Clocking
Use Scenario: Providing synchronized 100 MHz common clock to CPU, chipset, and peripheral controllers in server motherboard designs. IC Role / Device Role / Timing Role: Primary clock generator delivering PCIe Gen 4-compliant timing with <0.45 ps RMS jitter and zero ppm accuracy across all four outputs. Use Value: Eliminates need for multiple discrete oscillators while meeting Intel's TJ and RJ specifications for root port and endpoint interoperability.	Use Scenario: Generating 125 MHz, 156.25 MHz, and 312.5 MHz reference clocks for 1/10/25 GbE PHYs and packet switch ASICs in modular switches. IC Role / Device Role / Timing Role: Quad-output clock source with independent voltage domains (1.8 V for SerDes, 3.3 V for management MCU) and sub-1 ps jitter. Use Value: Enables single-chip timing for multi-rate Ethernet interfaces without external level translators or jitter cleaners.
FPGA-Based Video Processing System	Telecom Line Card Synchronization
Use Scenario: Supplying pixel clock (148.5 MHz), reference clock (156.25 MHz), and auxiliary clocks (27 MHz, 74.25 MHz) to Xilinx Zynq UltraScale+ MPSoC in broadcast video encoder. IC Role / Device Role / Timing Role: Configurable any-frequency generator supporting HDMI/SDI/ASI standards with programmable phase alignment between outputs. Use Value: Reduces BOM count and layout area versus discrete crystal + buffer solutions while maintaining frame-sync precision.	Use Scenario: Delivering stratum-3 compliant 2.048 MHz, 19.44 MHz, and 155.52 MHz clocks to TDM framer, OTN mapper, and control processor in optical line terminal (OLT) cards. IC Role / Device Role / Timing Role: High-stability clock synthesizer with crystal input and OC-12–qualified jitter (<1 ps RMS) for SONET/SDH transport layers. Use Value: Meets Telcordia GR-1244-CORE jitter mask without requiring external jitter attenuators or dual-loop PLLs.

PCIe Gen 4 Root Complex Timing

Ethernet Switch Fabric Clocking

Use Scenario: Providing synchronized 100 MHz common clock to CPU, chipset, and peripheral controllers in server motherboard designs.

IC Role / Device Role / Timing Role: Primary clock generator delivering PCIe Gen 4-compliant timing with <0.45 ps RMS jitter and zero ppm accuracy across all four outputs.

Use Value: Eliminates need for multiple discrete oscillators while meeting Intel's TJ and RJ specifications for root port and endpoint interoperability.

Use Scenario: Generating 125 MHz, 156.25 MHz, and 312.5 MHz reference clocks for 1/10/25 GbE PHYs and packet switch ASICs in modular switches.

IC Role / Device Role / Timing Role: Quad-output clock source with independent voltage domains (1.8 V for SerDes, 3.3 V for management MCU) and sub-1 ps jitter.

Use Value: Enables single-chip timing for multi-rate Ethernet interfaces without external level translators or jitter cleaners.

FPGA-Based Video Processing System

Telecom Line Card Synchronization

Use Scenario: Supplying pixel clock (148.5 MHz), reference clock (156.25 MHz), and auxiliary clocks (27 MHz, 74.25 MHz) to Xilinx Zynq UltraScale+ MPSoC in broadcast video encoder.

IC Role / Device Role / Timing Role: Configurable any-frequency generator supporting HDMI/SDI/ASI standards with programmable phase alignment between outputs.

Use Value: Reduces BOM count and layout area versus discrete crystal + buffer solutions while maintaining frame-sync precision.

Use Scenario: Delivering stratum-3 compliant 2.048 MHz, 19.44 MHz, and 155.52 MHz clocks to TDM framer, OTN mapper, and control processor in optical line terminal (OLT) cards.

IC Role / Device Role / Timing Role: High-stability clock synthesizer with crystal input and OC-12–qualified jitter (<1 ps RMS) for SONET/SDH transport layers.

Use Value: Meets Telcordia GR-1244-CORE jitter mask without requiring external jitter attenuators or dual-loop PLLs.

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-B04327-GM	Same pinout and register map; differs only in factory-programmed NVM configuration (different default frequency plan)	Identical use cases; requires reprogramming via ClockBuilder Pro if default config does not match target design	Select when preconfigured startup frequencies align with system boot requirements
LMK04832RHAT	Two-stage jitter cleaner architecture (vs. pure synthesizer); higher power (120 mA vs. 45 mA); supports JESD204B SYSREF	Better suited for RF sampling systems requiring ultra-low additive jitter; less optimal for cost-sensitive PCIe/Ethernet timing	Choose when additive jitter <0.15 ps RMS or deterministic SYSREF distribution is mandatory

Compared with Si5338A-B04327-GM and LMK04832RHAT, the SI5338B-B04327-GMR offers identical hardware functionality but ships with a distinct factory-programmed configuration optimized for general-purpose any-frequency synthesis - making it ideal for designs requiring full I²C programmability without preloaded constraints.

Availability

SI5338B-B04327-GMR is available at Aetrix Electronics and suitable for PCIe Gen 4 platform development, multi-gigabit Ethernet switch timing, and FPGA-based video processing systems requiring stable component supply and long-term lifecycle support.

Supply support for SI5338B-B04327-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 programmable, low-jitter clock generation for high-speed serial interfaces - designed specifically to replace multiple fixed-frequency oscillators while supporting PCIe, Ethernet, Fibre Channel, and broadcast video timing standards.

FAQ

What is the default factory configuration of the SI5338B-B04327-GMR?

The SI5338B-B04327-GMR ships with a pre-programmed non-volatile memory (NVM) image that configures all four outputs as LVDS at 100 MHz, 125 MHz, 156.25 MHz, and 312.5 MHz respectively, using a 25 MHz crystal input. This configuration is stored in one-time-programmable (OTP) memory and can be overwritten via I²C using ClockBuilder Pro software. The SI5338B-B04327-GMR retains this default state until actively reprogrammed.

Does the SI5338B-B04327-GMR support PCIe Gen 4 Separate Reference No Spread (SRNS) mode?

Yes, the SI5338B-B04327-GMR is validated for PCIe Gen 4 SRNS operation with 0.11–0.32 ps RMS jitter (typ/max) when configured with PLL bandwidth of 2–5 MHz and CDR set to 10 MHz. This performance meets the PCI-SIG Base Specification 4.0 rev. 0.5 requirements for endpoint timing. The SI5338B-B04327-GMR achieves this using its MultiSynth™ fractional-N synthesis engine and low-noise VCO architecture.

Can the SI5338B-B04327-GMR generate four different frequencies simultaneously above 350 MHz?

No - the SI5338B-B04327-GMR supports only two unique frequencies above 350 MHz simultaneously (Fvco/4 and Fvco/6), as constrained by its VCO operating range and synthesis architecture. For example, it can output 473.33 MHz and 710 MHz concurrently, but cannot generate three or four distinct frequencies >350 MHz. Frequencies ≤350 MHz have no such restriction and may all differ. This limitation applies to the SI5338B-B04327-GMR and all Si5338 variants.

How is spread-spectrum clocking (SSC) implemented on the SI5338B-B04327-GMR?

The SI5338B-B04327-GMR implements SSC independently on any output via dedicated registers controlling modulation depth (0.5–5.0%), center frequency (5–350 MHz), and modulation rate (33–63 kHz). SSC is generated digitally within the MultiSynth™ block and does not require external components. Default settings are 0.5% down-spread at ~31.5 kHz. The SI5338B-B04327-GMR maintains <1 ps RMS jitter even with SSC enabled, preserving signal integrity in EMI-sensitive environments.

What is the minimum input clock slew rate required to achieve specified jitter performance for the SI5338B-B04327-GMR?

To achieve the datasheet's 0.7 ps RMS phase jitter specification, the SI5338B-B04327-GMR requires a differential input slew rate >0.3 V/ns (measured at midpoint) on pins IN1/IN2/IN5/IN6, and a single-ended input slew rate >1.0 V/ns on pins IN3/IN4. These values are measured at 20–80% of swing amplitude. Failure to meet these slew rate thresholds increases deterministic jitter and degrades total jitter margin - particularly critical for PCIe and 10GbE applications where the SI5338B-B04327-GMR is commonly deployed.

SI5338B-B04327-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)

SI5338B-B04327-GMR FAQ

1.How can I place an order for SI5338B-B04327-GMR through Aetrix?

Please submit a Request for Quotation (RFQ) for SI5338B-B04327-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 SI5338B-B04327-GMR reliable?

The price and inventory of SI5338B-B04327-GMR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI5338B-B04327-GMR is usually 5 days.

3.What payment methods are accepted for SI5338B-B04327-GMR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI5338B-B04327-GMR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI5338B-B04327-GMR?

SI5338B-B04327-GMR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI5338B-B04327-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 SI5338B-B04327-GMR?

For technical support, including SI5338B-B04327-GMR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI5338B-B04327-GMR requirements.

6.How does Aetrix verify that SI5338B-B04327-GMR is sourced from the original manufacturer or authorized distributors?

All SI5338B-B04327-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 SI5338B-B04327-GMR meets industry standards.

7.What is the process for return or replacement of SI5338B-B04327-GMR?

All SI5338B-B04327-GMR units undergo pre-shipment inspection (PSI). If there is an issue with SI5338B-B04327-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 SI5338B-B04327-GMR part is unused and in its original packaging.

Return procedure for SI5338B-B04327-GMR:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…