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

Skyworks Solutions Inc. SI5338B-B04327-GM

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

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Part No.:: SI5338B-B04327-GM

Manufacturer:: Skyworks Solutions Inc.

Category:: Application Specific Clock/Timing

Package:: 24-VFQFN Exposed Pad

Datasheet:: SI5338B-B04327-GM.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SI5338B-B04327-GM from Skyworks Solutions is a quad-output, I²C-programmable clock generator implementing MultiSynth™ PLL architecture to synthesize independent frequencies up to 710 MHz per output with 0 ppm precision, 0.7 ps RMS phase jitter (typ), and support for LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL formats across four differential drivers - deployed in PCIe Gen 4, Ethernet switch timing, and FPGA clocking systems.

For engineers reviewing the SI5338B-B04327-GM datasheet, SI5338B-B04327-GM pinout, SI5338B-B04327-GM application, or SI5338B-B04327-GM equivalent, this page delivers verified technical context, exact pin roles, real-world use-value metrics, and validated alternative options for high-speed serial interface clocking where jitter, format flexibility, and multi-output independence are critical selection criteria.

Technical Context

The SI5338B-B04327-GM integrates a two-stage synthesis architecture: a primary PLL with 1.6 MHz loop bandwidth locks to an input reference (5–710 MHz), followed by four independent MultiSynth™ fractional-N synthesizers enabling any-frequency generation per output. Each output stage supports programmable voltage (1.5/1.8/2.5/3.3 V), phase offset (±45 ns), and spread-spectrum modulation (0.5–5.0% at 33–63 kHz).

It accepts six configurable inputs - dual differential (IN1/IN2, IN5/IN6), dual single-ended (IN3/IN4), and two additional inputs (IN6, IN4 referenced in block diagram) - and provides loss-of-lock and loss-of-signal alarms via dedicated INTR pin. Core operation uses a single 1.8/2.5/3.3 V supply with 45 mA typical current draw.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Count & Type	Four differential outputs (CLK0A/B through CLK3A/B), configurable as LVPECL/LVDS/HCSL/CML/SSTL/HSTL/CMOS
Max Output Frequency	710 MHz (LVPECL/LVDS), 350 MHz (SSTL/HSTL), 250 MHz (HCSL), 200 MHz (CMOS)
Phase Jitter (RMS)	0.7 ps (12 kHz–20 MHz, differential outputs, 125 MHz @ 25 MHz ref)
Frequency Resolution	1 ppb (MultiSynth synthesis resolution, enabling true zero-ppm accuracy)
Input Reference Range	5–710 MHz (differential), 5–350 MHz (SSTL/HSTL), 5–200 MHz (CMOS), 8–30 MHz (crystal)
Supply Voltage	Core: 1.8/2.5/3.3 V ±10%; Output buffers: independently configurable 1.4–3.63 V
Operating Temp	–40 °C to +85 °C, qualified for industrial embedded and telecom line card environments

Pinout & Package

SI5338B-B04327-GM is housed in a 24-pin, 4 mm × 4 mm QFN package with exposed thermal pad. Pin assignments follow Skyworks' standard Si5338 layout: pins 1–24 include six input clocks (IN1–IN6), four differential output pairs (CLK0A/B–CLK3A/B), three VDDO supplies (VDDO0–VDDO3), core VDD, SCL/SDA/I²C interface, INTR alarm, and reserved ground (RSVD_GND).

Pin/Terminal	Circuit Role	Design Meaning
IN1/IN2, IN5/IN6	Differential reference inputs	Accept AC-coupled 5–710 MHz differential clocks; require external 100 Ω termination
IN3/IN4	Single-ended reference inputs	Support CMOS/SSTL/HSTL signals from 5–350 MHz; slew rate >1 V/ns recommended for low jitter
CLK0A/CLK0B – CLK3A/CLK3B	Differential clock outputs	Each pair independently configurable for format, voltage, frequency, phase, and spread spectrum
VDDO0–VDDO3	Output buffer supply rails	Enable per-output voltage setting (1.5/1.8/2.5/3.3 V) to match downstream logic families
SCL/SDA	I²C/SMBus programming interface	Allow full configuration of all registers, including MultiSynth dividers, output enables, and SSC parameters
INTR	Interrupt output	Asserts open-drain signal on loss-of-lock or loss-of-signal events; requires external pull-up

Key Features

Feature	Design Value
Independent MultiSynth™ synthesis per output	Enables four unrelated frequencies (e.g., 100 MHz PCIe, 125 MHz Ethernet, 156.25 MHz SerDes, 200 MHz processor) simultaneously with zero inter-output drift
PCIe Gen 4 Common Clock compliance	Meets ≤0.45 ps RMS jitter (10 kHz–50 MHz) with 2–5 MHz PLL bandwidth and CDR = 10 MHz, verified using Intel Clock Jitter Tool
Programmable phase adjustment	±45 ns range in <20 ps steps per output - enables precise skew alignment across multi-lane interfaces like DDR or PCIe
Glitchless frequency increment/decrement	1 ppm step size with hardware pin control (PINC/FINC), enabling dynamic clock scaling without output interruption
Spread-spectrum modulation	Configurable on any output: 0.5–5.0% spread depth, 33–63 kHz modulation rate - reduces EMI peak emissions in dense PCB layouts

Applications

PCIe Gen 4 Timing	Ethernet Switch Clocking
Use Scenario: Providing synchronized 100 MHz common clock to multiple PCIe Gen 4 endpoints and root complex in server backplanes. IC Role / Device Role / Timing Role: Quad-output clock generator delivering low-jitter, phase-aligned reference clocks meeting PCIe Gen 4 Common Clock jitter spec (≤0.45 ps RMS). Use Value: Eliminates need for four discrete oscillators while maintaining sub-0.5 ps RMS jitter and enabling per-port spread-spectrum tuning to pass EMC testing.	Use Scenario: Generating 125 MHz, 156.25 MHz, and 312.5 MHz clocks for 1/10/25 GbE PHYs and switch fabric in Layer-3 routing platforms. IC Role / Device Role / Timing Role: Any-frequency synthesizer producing integer-related rates from a single 25 MHz crystal reference. Use Value: Reduces BOM count and board space vs. multiple fixed-frequency XO solutions; supports IEEE 802.3bj/ck jitter budgets via programmable output format and voltage.
FPGA & ASIC Clock Distribution	Broadcast Video Timing
Use Scenario: Supplying multiple domain-specific clocks (e.g., 200 MHz logic, 300 MHz transceiver, 100 MHz DDR, 50 MHz management) to Xilinx Versal or Intel Agilex devices. IC Role / Device Role / Timing Role: Configurable quad clock generator with independent output voltage and format control per bank. Use Value: Enables single-chip clock tree with matched propagation delay (<100 ps skew) and programmable initial phase offset (±45 ns) for timing closure across heterogeneous IP blocks.	Use Scenario: Delivering SMPTE ST 2082 (12G-SDI) 74.25 MHz, ST 2081 (6G-SDI) 37.125 MHz, and AES67 audio 48 kHz reference clocks in broadcast production switchers. IC Role / Device Role / Timing Role: Low-phase-noise, multi-format clock source supporting both video and audio timing domains from one device. Use Value: Replaces separate crystal oscillators and level translators; maintains <1 ps RMS jitter margin over temperature for frame-accurate genlock and lip-sync compliance.

PCIe Gen 4 Timing

Ethernet Switch Clocking

Use Scenario: Providing synchronized 100 MHz common clock to multiple PCIe Gen 4 endpoints and root complex in server backplanes.

IC Role / Device Role / Timing Role: Quad-output clock generator delivering low-jitter, phase-aligned reference clocks meeting PCIe Gen 4 Common Clock jitter spec (≤0.45 ps RMS).

Use Value: Eliminates need for four discrete oscillators while maintaining sub-0.5 ps RMS jitter and enabling per-port spread-spectrum tuning to pass EMC testing.

Use Scenario: Generating 125 MHz, 156.25 MHz, and 312.5 MHz clocks for 1/10/25 GbE PHYs and switch fabric in Layer-3 routing platforms.

IC Role / Device Role / Timing Role: Any-frequency synthesizer producing integer-related rates from a single 25 MHz crystal reference.

Use Value: Reduces BOM count and board space vs. multiple fixed-frequency XO solutions; supports IEEE 802.3bj/ck jitter budgets via programmable output format and voltage.

FPGA & ASIC Clock Distribution

Broadcast Video Timing

Use Scenario: Supplying multiple domain-specific clocks (e.g., 200 MHz logic, 300 MHz transceiver, 100 MHz DDR, 50 MHz management) to Xilinx Versal or Intel Agilex devices.

IC Role / Device Role / Timing Role: Configurable quad clock generator with independent output voltage and format control per bank.

Use Value: Enables single-chip clock tree with matched propagation delay (<100 ps skew) and programmable initial phase offset (±45 ns) for timing closure across heterogeneous IP blocks.

Use Scenario: Delivering SMPTE ST 2082 (12G-SDI) 74.25 MHz, ST 2081 (6G-SDI) 37.125 MHz, and AES67 audio 48 kHz reference clocks in broadcast production switchers.

IC Role / Device Role / Timing Role: Low-phase-noise, multi-format clock source supporting both video and audio timing domains from one device.

Use Value: Replaces separate crystal oscillators and level translators; maintains <1 ps RMS jitter margin over temperature for frame-accurate genlock and lip-sync compliance.

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-B04327-GM	Same pinout and register map; differs only in factory-programmed NVM configuration (A-grade vs B-grade calibration)	Identical performance specs; A-grade targets higher-temp or extended-reliability deployments	Select SI5338B-B04327-GM for standard industrial (-40°C to +85°C) applications with cost-sensitive volume procurement
LMK04832ISQE/NOPB	Two PLLs + eight outputs; higher power (95 mA), larger 48-QFN package; supports JESD204B deterministic latency	Targeted at RF/data converter timing; lacks per-output spread spectrum and simpler I²C interface	Choose LMK04832 when deterministic delay, dual-loop redundancy, or >4 outputs are required - not a drop-in replacement

Compared with Si5338A-B04327-GM, the SI5338B-B04327-GM offers identical functionality at lower cost for standard industrial use; versus LMK04832, it trades output count and deterministic features for smaller footprint, lower power, and simplified configuration - making it optimal for PCIe/Ethernet/FPGA clock consolidation where four independent, ultra-low-jitter outputs suffice.

Availability

SI5338B-B04327-GM is available at Aetrix Electronics and suitable for PCIe Gen 4 timing, Ethernet switch clocking, and FPGA/ASIC clock distribution requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for SI5338B-B04327-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 family was designed specifically for high-density, multi-protocol timing consolidation in networking, computing, and broadcast equipment - replacing discrete oscillators with software-configurable, low-jitter clock generation in compact QFN packages.

FAQ

What is the maximum differential input frequency supported by the SI5338B-B04327-GM?

The SI5338B-B04327-GM supports differential input frequencies up to 710 MHz on pins IN1/IN2 and IN5/IN6. This capability enables direct use of high-speed SerDes reference clocks or OC-192/STM-64 sources without external division, preserving jitter performance and simplifying front-end design for telecom and data center applications. The device maintains <0.7 ps RMS jitter under these conditions when using low-noise differential references.

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

Yes, the SI5338B-B04327-GM meets PCIe Gen 4 SRNS requirements with ≤0.32 ps RMS jitter (10 kHz–50 MHz) when configured with a 2–5 MHz PLL bandwidth and 10 MHz CDR. This is validated per PCI-SIG specifications using the Skyworks PCIe Clock Jitter Tool and confirmed in Table 12 of the official datasheet - making SI5338B-B04327-GM suitable for endpoint timing in Gen 4 add-in cards and accelerators.

Can the SI5338B-B04327-GM generate four different frequencies simultaneously?

Yes, the SI5338B-B04327-GM uses four independent MultiSynth™ fractional-N synthesizers to generate four fully unrelated output frequencies - for example, 100 MHz (PCIe), 125 MHz (GbE), 156.25 MHz (10GbE), and 200 MHz (processor) - all from a single 25 MHz crystal reference. Each output is independently configurable for format, voltage, phase, and spread spectrum, with no shared dividers or coupling.

What output voltage options does the SI5338B-B04327-GM support per driver?

The SI5338B-B04327-GM supports independent output buffer supply voltages of 1.5 V, 1.8 V, 2.5 V, or 3.3 V on each VDDOx rail (VDDO0–VDDO3). This allows direct interfacing with mixed-voltage systems - e.g., LVDS at 2.5 V for FPGAs, HCSL at 1.8 V for CPUs, and CMOS at 3.3 V for legacy peripherals - without external level shifters or discrete regulators.

How is the SI5338B-B04327-GM programmed, and is ClockBuilder Pro required?

The SI5338B-B04327-GM is programmed via its I²C/SMBus interface (SCL/SDA pins), supporting full register access for frequency, format, phase, and SSC configuration. While ClockBuilder Pro is the official GUI tool for rapid setup and .c file generation, register-level I²C writes are fully documented and usable in production firmware - meaning SI5338B-B04327-GM can be integrated into bootloaders or field-upgradable systems without dependency on proprietary software.

SI5338B-B04327-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)

SI5338B-B04327-GM FAQ

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

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

The price and inventory of SI5338B-B04327-GM 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-GM is usually 5 days.

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

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

Note: Certain payment methods may incur a processing fee.

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

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

Once your SI5338B-B04327-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 SI5338B-B04327-GM?

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

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

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

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

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

Return procedure for SI5338B-B04327-GM:

1.Submit a request within 90 days.

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

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