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

Skyworks Solutions Inc. SI5338M-B05842-GM

Name: SI5338M-B05842-GM
Brand: Skyworks Solutions Inc.
SKU: SI5338M-B05842-GM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI5338M-B05842-GM

Manufacturer:: Skyworks Solutions Inc.

Category:: Application Specific Clock/Timing

Package:: 24-VFQFN Exposed Pad

Datasheet:: SI5338M-B05842-GM.pdf

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

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Product details

Overview

SI5338M-B05842-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 SI5338M-B05842-GM datasheet, SI5338M-B05842-GM pinout, SI5338M-B05842-GM application, or SI5338M-B05842-GM equivalent, key selection criteria include its MultiSynth™-based any-frequency synthesis (0.16–710 MHz per output), independent output voltage support (1.5/1.8/2.5/3.3 V), spread-spectrum capability (0.5–5.0% at 33–63 kHz), and 24-QFN package compatibility with space-constrained timing designs.

Technical Context

The SI5338M-B05842-GM implements a two-stage PLL architecture: a high-stability reference stage followed by four independent MultiSynth™ fractional-N synthesizers, each driving one output pair. Its input flexibility supports external crystals (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), and differential clocks (5–710 MHz).

Each output driver supports LVPECL/LVDS/HCSL/CMOS/SSTL/HSTL formats with programmable voltage per channel, independent phase adjustment (<20 ps steps), and glitchless frequency increment/decrement in 1 ppm steps. The device operates from a single 1.8/2.5/3.3 V core supply with 45 mA typical current draw.

Key Specifications

Parameter	Value and Actual Design Meaning
Phase Jitter (RMS)	0.7 ps - meets PCIe Gen 3/4 SRNS and GbE jitter requirements for high-speed serial links
Output Frequency Range	0.16–710 MHz - covers PCIe 100 MHz, Ethernet 125/156.25 MHz, Fibre Channel 212.5/425 MHz, and processor clocks
Input Reference Support	Crystal (8–30 MHz), CMOS (5–200 MHz), differential (5–710 MHz) - enables flexible system-level clock sourcing
Output Formats	LVPECL, LVDS, HCSL, CMOS, SSTL, HSTL - allows direct interface to FPGAs, ASICs, SerDes, and memory controllers
Supply Voltage	Core: 1.8/2.5/3.3 V; Output buffers: 1.4–3.63 V - supports mixed-voltage board designs without level shifters
Package	24-pin QFN, 4 × 4 mm - surface-mount compatible with standard reflow profiles and high-density PCB layouts
Operating Temperature	–40 to +85 °C - qualified for industrial and telecom line card environments

Pinout & Package

SI5338M-B05842-GM uses a 24-lead, 4 × 4 mm QFN package with exposed thermal pad. Pin assignments follow the standard Si5338 top-view layout: IN1/IN2 (differential ref 1), IN3/IN4 (single-ended ref 1/2), IN5/IN6 (differential ref 2/3), CLK0A/CLK0B through CLK3A/CLK3B (four differential output pairs), VDDO0–VDDO3 (independent output supply pins), VDD (core supply), SCL/SDA (I²C interface), INTR (interrupt output), and RSVD_GND (reserved ground).

Pin/Terminal	Circuit Role	Design Meaning
CLK0A / CLK0B	Differential Output Pair 0	Configurable as LVPECL/LVDS/HCSL; supports 0.16–710 MHz; independent voltage (VDDO0)
CLK1A / CLK1B	Differential Output Pair 1	Independent frequency/format/voltage control; synchronized skew <100 ps vs. CLK0
CLK2A / CLK2B	Differential Output Pair 2	Supports PCIe Gen 4 common clock (100 MHz) with <0.45 ps RMS jitter
CLK3A / CLK3B	Differential Output Pair 3	Programmable phase offset (±45 ns); glitchless frequency tuning via PINC/FDEC pins
IN1 / IN2	Differential Reference Input 1	Accepts 5–710 MHz; internal 100 Ω termination; optimized for low-jitter performance
IN3 / IN4	Single-Ended Reference Inputs	CMOS-compatible (5–200 MHz); VIH = 0.7×VDD, VIL = 0.3×VDD; 4 pF input capacitance
SCL / SDA	I²C Serial Interface	Standard SMBus-compatible; supports ClockBuilder Pro programming and runtime configuration
INTR	Interrupt Output	Open-drain status signal indicating loss-of-lock or loss-of-signal events

Key Features

Feature	Design Value
MultiSynth™ Synthesis	Four independent fractional-N synthesizers enable true zero-ppm accuracy on all outputs without external VCXOs
PCIe Gen 3/4 Compliance	Meets SRNS jitter spec (0.11–0.45 ps RMS) and common clock timing requirements for host/root complex applications
Spread Spectrum Clocking	Configurable on any output: 0.5–5.0% down-spread at 33–63 kHz - reduces EMI in dense PCB layouts
Independent Output Control	Per-output voltage (1.5/1.8/2.5/3.3 V), format, frequency, phase, and enable - eliminates need for external buffers
Glitchless Frequency Tuning	Hardware pin-controlled frequency increment/decrement in 1 ppm steps - enables dynamic clock scaling without disruption
Low-Power Operation	45 mA typical core current at 100 MHz outputs; 12 mA in buffer-only mode - suitable for thermally constrained systems

Applications

PCIe Gen 4 Host Platform	Ethernet Switch Timing
Use Scenario: Providing synchronized 100 MHz common clock and 125 MHz reference to multiple PCIe Gen 4 endpoints and Ethernet PHYs on a server motherboard. IC Role / Device Role / Timing Role: Quad clock generator delivering four low-jitter, independently configured clocks - one for PCIe root complex, one for switch fabric, two for SerDes lanes. Use Value: Eliminates four discrete oscillators; achieves <0.45 ps RMS jitter required for PCIe Gen 4 compliance; reduces BOM count and layout area by 60%.	Use Scenario: Generating 125 MHz, 156.25 MHz, and 312.5 MHz clocks for 1/10 GbE MAC/PHY interfaces and packet buffer memory in a Layer 3 switch. IC Role / Device Role / Timing Role: Any-frequency clock synthesizer providing precise, jitter-clean clocks directly matched to IEEE 802.3 standards. Use Value: Enables single-device timing for multi-rate Ethernet; supports HCSL and LVDS outputs for direct SerDes drive; meets GbE random jitter spec (0.38 ps RMS).
FPGA-Based Video Processing	Telecom Line Card Synchronization
Use Scenario: Supplying pixel clock (74.25 MHz), reference clock (148.5 MHz), and DDR3 memory clock (400 MHz) to a broadcast video encoder FPGA. IC Role / Device Role / Timing Role: Programmable clock source with independent phase alignment across three domains to meet setup/hold timing closure. Use Value: Achieves <20 ps phase step resolution for sub-cycle skew control; supports CMOS and LVDS outputs on same device; simplifies timing convergence in multi-clock-domain designs.	Use Scenario: Distributing synchronized 2.048 MHz, 19.44 MHz, and 155.52 MHz clocks across SONET/SDH, T1/E1, and OTN interfaces on a carrier-grade line card. IC Role / Device Role / Timing Role: High-stability frequency translator accepting OC-12 reference and generating multiple telecom-standard frequencies. Use Value: Delivers 0.7 ps RMS jitter at 155.52 MHz meeting OC-12 requirements; supports differential inputs for noise immunity in noisy backplane environments.

PCIe Gen 4 Host Platform

Ethernet Switch Timing

Use Scenario: Providing synchronized 100 MHz common clock and 125 MHz reference to multiple PCIe Gen 4 endpoints and Ethernet PHYs on a server motherboard.

IC Role / Device Role / Timing Role: Quad clock generator delivering four low-jitter, independently configured clocks - one for PCIe root complex, one for switch fabric, two for SerDes lanes.

Use Value: Eliminates four discrete oscillators; achieves <0.45 ps RMS jitter required for PCIe Gen 4 compliance; reduces BOM count and layout area by 60%.

Use Scenario: Generating 125 MHz, 156.25 MHz, and 312.5 MHz clocks for 1/10 GbE MAC/PHY interfaces and packet buffer memory in a Layer 3 switch.

IC Role / Device Role / Timing Role: Any-frequency clock synthesizer providing precise, jitter-clean clocks directly matched to IEEE 802.3 standards.

Use Value: Enables single-device timing for multi-rate Ethernet; supports HCSL and LVDS outputs for direct SerDes drive; meets GbE random jitter spec (0.38 ps RMS).

FPGA-Based Video Processing

Telecom Line Card Synchronization

Use Scenario: Supplying pixel clock (74.25 MHz), reference clock (148.5 MHz), and DDR3 memory clock (400 MHz) to a broadcast video encoder FPGA.

IC Role / Device Role / Timing Role: Programmable clock source with independent phase alignment across three domains to meet setup/hold timing closure.

Use Value: Achieves <20 ps phase step resolution for sub-cycle skew control; supports CMOS and LVDS outputs on same device; simplifies timing convergence in multi-clock-domain designs.

Use Scenario: Distributing synchronized 2.048 MHz, 19.44 MHz, and 155.52 MHz clocks across SONET/SDH, T1/E1, and OTN interfaces on a carrier-grade line card.

IC Role / Device Role / Timing Role: High-stability frequency translator accepting OC-12 reference and generating multiple telecom-standard frequencies.

Use Value: Delivers 0.7 ps RMS jitter at 155.52 MHz meeting OC-12 requirements; supports differential inputs for noise immunity in noisy backplane environments.

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad clock generator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Si5332A-D05842-GM	Lower jitter (0.35 ps RMS), integrated crystal option, higher frequency range (up to 3.2 GHz), but larger 32-QFN package	Better suited for ultra-low-jitter 5G wireless and optical transport where sub-0.4 ps RMS is mandatory	Select when PCIe Gen 5 or OTU4 timing is required; avoid if board space or cost sensitivity favors the Si5338's 24-QFN footprint
ICS8430I-01LG	Fixed-frequency (no I²C programming), lower integration (no spread spectrum, no phase adjust), 0.9 ps RMS jitter, 32-QFN	Targeted at cost-sensitive, high-volume applications where clock frequencies are static and design reuse is prioritized	Choose for legacy PCIe Gen 2/3 systems with fixed timing trees; not suitable for dynamic reconfiguration or multi-standard support

Compared with Si5332A-D05842-GM and ICS8430I-01LG, the SI5338M-B05842-GM delivers optimal balance of programmability, jitter performance, and compact packaging - enabling one-time hardware design to support PCIe, Ethernet, and telecom timing across multiple product generations without layout changes.

Availability

SI5338M-B05842-GM is available at Aetrix Electronics and suitable for PCIe Gen 4 host platforms, Ethernet switch timing, and FPGA-based video processing requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for SI5338M-B05842-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 is designed for high-performance, software-configurable clock generation in data center, networking, and communications equipment - emphasizing low jitter, multi-format flexibility, and field-upgradable timing architectures.

FAQ

What is the primary function of the SI5338M-B05842-GM in a system design?

The SI5338M-B05842-GM serves as an I²C-programmable quad clock generator that synthesizes up to four independent, low-jitter output clocks from a single reference input. It replaces multiple discrete oscillators in applications like PCIe Gen 4, Ethernet switches, and FPGA clock trees. Its MultiSynth™ technology ensures zero-ppm frequency accuracy, while independent output configuration supports mixed-signal environments without external level shifters or buffers.

Does the SI5338M-B05842-GM support PCIe Gen 4 timing requirements?

Yes, the SI5338M-B05842-GM meets PCIe Gen 4 Common Clock jitter specifications with 0.15–0.45 ps RMS typical phase jitter (10 kHz–50 MHz band) when configured per Skyworks' recommended settings. It is explicitly validated for PCIe Gen 1/2/3/4 Common Clock and Gen 3 SRNS compliance, supporting 100 MHz HCSL outputs with measured jitter below the 0.5 ps RMS limit defined in the PCI-SIG specification.

How is the SI5338M-B05842-GM programmed and configured?

The SI5338M-B05842-GM is programmed via its I²C/SMBus-compatible serial interface using Skyworks' ClockBuilder Pro software. This GUI tool enables full register configuration - including input selection, output frequency, format, voltage, spread spectrum, and phase offset - and generates custom configuration files. Configuration can be stored in on-chip OTP memory for autonomous startup, eliminating the need for external microcontrollers or firmware.

What package type and pin count does the SI5338M-B05842-GM use?

The SI5338M-B05842-GM uses a 24-lead QFN package measuring 4 × 4 mm with an exposed thermal pad. It features four differential output pairs (CLK0A/B through CLK3A/B), six reference inputs (IN1–IN6), independent output supply pins (VDDO0–VDDO3), core supply (VDD), I²C interface (SCL/SDA), interrupt output (INTR), and reserved ground (RSVD_GND). Pinout matches the standard Si5338 family layout documented in Skyworks' datasheet Rev. 1.6.

Can the SI5338M-B05842-GM generate spread spectrum clocking (SSC) on its outputs?

Yes, the SI5338M-B05842-GM supports highly configurable spread spectrum clocking on any output: spread range from 0.5% to 5.0%, modulation rate from 33 kHz to 63 kHz, and selectable up/down/spread modes. SSC is programmable per-output via I²C registers and can be enabled/disabled dynamically. This feature reduces electromagnetic interference (EMI) in high-density PCBs without compromising timing integrity or system compatibility.

SI5338M-B05842-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)

SI5338M-B05842-GM FAQ

1.How can I place an order for SI5338M-B05842-GM through Aetrix?

Please submit a Request for Quotation (RFQ) for SI5338M-B05842-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 SI5338M-B05842-GM reliable?

The price and inventory of SI5338M-B05842-GM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI5338M-B05842-GM is usually 5 days.

3.What payment methods are accepted for SI5338M-B05842-GM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI5338M-B05842-GM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI5338M-B05842-GM?

SI5338M-B05842-GM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI5338M-B05842-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 SI5338M-B05842-GM?

For technical support, including SI5338M-B05842-GM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI5338M-B05842-GM requirements.

6.How does Aetrix verify that SI5338M-B05842-GM is sourced from the original manufacturer or authorized distributors?

All SI5338M-B05842-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 SI5338M-B05842-GM meets industry standards.

7.What is the process for return or replacement of SI5338M-B05842-GM?

All SI5338M-B05842-GM units undergo pre-shipment inspection (PSI). If there is an issue with SI5338M-B05842-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 SI5338M-B05842-GM part is unused and in its original packaging.

Return procedure for SI5338M-B05842-GM:

1.Submit a request within 90 days.

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

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