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Home > Products > Integrated Circuits (ICs) > Clock/Timing > Clock Generators, PLLs, Frequency Synthesizers

Skyworks Solutions Inc. SI5332DC08837-GM2R

Name: SI5332DC08837-GM2R
Brand: Skyworks Solutions Inc.
SKU: SI5332DC08837-GM2R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI5332DC08837-GM2R

Manufacturer:: Skyworks Solutions Inc.

Category:: Clock Generators, PLLs, Frequency Synthesizers

Package:: -

Datasheet:: SI5332DC08837-GM2R.pdf

Description:: IC CLOCK GENERATOR QFN

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Product details

Overview

SI5332DC08837-GM2R from Silicon Labs is an 8-output, factory-programmed, low-jitter clock generator based on MultiSynth™ fractional synthesis. It delivers up to eight differential outputs (LVDS/LVPECL/HCSL) or sixteen LVCMOS outputs, supports 5–333.33 MHz differential and 5–170 MHz LVCMOS frequencies, achieves 190 fs RMS phase jitter (external crystal), and operates across –40 to +85 °C for Ethernet switch timing and server clock tree consolidation.

For engineers reviewing the SI5332DC08837-GM2R datasheet, SI5332DC08837-GM2R pinout, SI5332DC08837-GM2R application, or SI5332DC08837-GM2R equivalent, key selection criteria include output count (8), QFN-40 package, external crystal input support, I²C programmability, multi-supply bank configuration, and PCIe Gen4/SRIS compliance - all confirmed in the official Si5332 family reference manual and ordering guide.

Technical Context

The SI5332DC08837-GM2R implements a two-stage synthesis architecture: a wideband PLL locks to a 16–50 MHz external crystal (XA/XB), then feeds up to three independent MultiSynth fractional dividers and five integer dividers. Its cross-point mux routes any synthesized or divided frequency to individual outputs or shared banks.

It features six VDDO supply pins supporting mixed-voltage operation (1.5/1.8/2.5/3.3 V), seven user-configurable hardware input pins (for OE, spread-spectrum enable, or input selection), and synchronous output disable to prevent runt pulses - all verified in the Si5332-GM2 functional block diagram and register map.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Count	8 differential outputs (or 16 LVCMOS); enables consolidated clock tree with fan-out flexibility.
Jitter Performance	190 fs RMS (12 kHz–20 MHz); meets PCIe Gen4 and SRIS timing margin requirements.
Frequency Range	Differential: 5–333.33 MHz; supports Ethernet 1G/10G/25G, DDR4/5 memory clocks, and CPU reference clocks.
Synthesis Modes	Integer and fractional synthesis per output; eliminates need for multiple fixed-frequency oscillators.
Input Reference	External crystal (16–50 MHz) at XA/XB; no embedded crystal - requires external 50 MHz fundamental-mode crystal.
Supply Voltages	VDD core: 1.8/2.5/3.3 V; VDDO banks: 1.5/1.8/2.5/3.3 V; supports mixed-signal SoC interface voltage levels.
Package	40-pin QFN (6 × 6 mm, 0.5 mm pitch); RoHS-6 compliant; validated land pattern in Si5332 datasheet Figure 8.2.

Pinout & Package

SI5332DC08837-GM2R uses a 40-pin QFN (6 × 6 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions are defined per the Si5332-GM2 block diagram and Pin Descriptions section (Datasheet Rev. 1.1, Section 6.2).

Pin/Terminal	Circuit Role	Design Meaning
XA, XB	Crystal oscillator input	Accepts 16–50 MHz fundamental-mode crystal; internal load capacitance configurable via register.
CLKIN_2, CLKIN_2#	Differential reference input	Supports LVPECL/LVDS/HCSL; optional synchronous mode input if crystal not used.
VDDO0–VDDO5	Output bank supply rails	Each powers one or more outputs; enables independent 1.5/1.8/2.5/3.3 V signaling per bank.
OUT0–OUT7, OUT0b–OUT7b	Differential clock outputs	Configurable per-output signal format (LVDS/LVPECL/HCSL) and skew (±122.5 ps in 35 ps steps).
SCLK, SDATA	I²C serial interface	Standard 100/400 kHz I²C bus; used for in-circuit reprogramming or runtime configuration updates.
Input1–Input7	Universal hardware control pins	Programmable as OE#, SS_EN, CLKIN_SEL[1:0], or I²C address select via ClockBuilder Pro.

Key Features

Feature	Design Value
MultiSynth™ fractional synthesis	Enables any-frequency output up to 250 MHz with zero ppm synthesis error - replaces discrete oscillator arrays.
Cross-point output mux	Routes any MultiSynth or integer divider output to any output bank - maximizes routing flexibility without redesign.
Independent output supply banks	Six VDDO pins allow simultaneous 1.8 V DDR and 3.3 V PHY signaling on same device - eliminates level-shifters.
Configurable output skew	35 ps resolution, ±122.5 ps range per differential pair - enables precise trace-length compensation in high-speed SerDes lanes.
Spread spectrum modulation	Down or center spread from –0.1% to –2.5% at 30–33 kHz - reduces EMI peak emissions without affecting system timing.

Applications

Server Clock Distribution	Ethernet Switch Timing
Use Scenario: Generating synchronized 100 MHz, 156.25 MHz, and 312.5 MHz clocks for CPU, memory controller, and PCIe Gen4 root complex in 1U rack servers. IC Role / Device Role / Timing Role: Primary clock generator providing jitter-clean, multi-voltage, multi-format reference clocks across processor, memory, and I/O subsystems. Use Value: Replaces 4–5 discrete oscillators and buffers; reduces BOM count and PCB area while maintaining <200 fs RMS jitter for PCIe Gen4 link training.	Use Scenario: Delivering 125 MHz SGMII, 156.25 MHz XAUI, and 312.5 MHz 25G Ethernet clocks to multiple PHYs and MACs in Layer 3 switches. IC Role / Device Role / Timing Role: Centralized timing hub with bank-isolated VDDO supplies enabling concurrent 1.8 V SFP+ and 3.3 V management interface clocks. Use Value: Eliminates inter-bank noise coupling; configurable skew aligns SerDes launch edges across 16-lane switch fabric interfaces.
Broadcast Video Sync	Industrial Embedded Computing
Use Scenario: Providing genlock-capable 27 MHz, 74.25 MHz, and 148.5 MHz SMPTE ST 2082/ST 2110 reference clocks to video processing FPGAs and ADC/DACs. IC Role / Device Role / Timing Role: Low-jitter, multi-output clock source with deterministic phase relationships between video pixel and audio sample clocks. Use Value: Meets SMPTE ST 2059-2 wander tolerance (<10 ns) via 190 fs RMS jitter and synchronous output disable during frame boundary transitions.	Use Scenario: Supplying 50 MHz real-time OS timer, 100 MHz FPGA fabric clock, and 200 MHz ADC sampling clock in ruggedized edge AI gateways operating at –40 °C. IC Role / Device Role / Timing Role: Industrial-grade clock generator with extended temperature support and robust power supply filtering for mission-critical timing. Use Value: Integrated power supply filtering and –40 to +85 °C qualification ensure stable operation in uncontrolled thermal environments without derating.

Server Clock Distribution

Ethernet Switch Timing

Use Scenario: Generating synchronized 100 MHz, 156.25 MHz, and 312.5 MHz clocks for CPU, memory controller, and PCIe Gen4 root complex in 1U rack servers.

IC Role / Device Role / Timing Role: Primary clock generator providing jitter-clean, multi-voltage, multi-format reference clocks across processor, memory, and I/O subsystems.

Use Value: Replaces 4–5 discrete oscillators and buffers; reduces BOM count and PCB area while maintaining <200 fs RMS jitter for PCIe Gen4 link training.

Use Scenario: Delivering 125 MHz SGMII, 156.25 MHz XAUI, and 312.5 MHz 25G Ethernet clocks to multiple PHYs and MACs in Layer 3 switches.

IC Role / Device Role / Timing Role: Centralized timing hub with bank-isolated VDDO supplies enabling concurrent 1.8 V SFP+ and 3.3 V management interface clocks.

Use Value: Eliminates inter-bank noise coupling; configurable skew aligns SerDes launch edges across 16-lane switch fabric interfaces.

Broadcast Video Sync

Industrial Embedded Computing

Use Scenario: Providing genlock-capable 27 MHz, 74.25 MHz, and 148.5 MHz SMPTE ST 2082/ST 2110 reference clocks to video processing FPGAs and ADC/DACs.

IC Role / Device Role / Timing Role: Low-jitter, multi-output clock source with deterministic phase relationships between video pixel and audio sample clocks.

Use Value: Meets SMPTE ST 2059-2 wander tolerance (<10 ns) via 190 fs RMS jitter and synchronous output disable during frame boundary transitions.

Use Scenario: Supplying 50 MHz real-time OS timer, 100 MHz FPGA fabric clock, and 200 MHz ADC sampling clock in ruggedized edge AI gateways operating at –40 °C.

IC Role / Device Role / Timing Role: Industrial-grade clock generator with extended temperature support and robust power supply filtering for mission-critical timing.

Use Value: Integrated power supply filtering and –40 to +85 °C qualification ensure stable operation in uncontrolled thermal environments without derating.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Si5332DC08838-GM2R	Same 8-output GM2 package but factory-programmed with embedded 50 MHz crystal (Si5332E variant); no external crystal required.	Preferred where board space is constrained and crystal layout sensitivity must be avoided.	Select only if eliminating external crystal and reducing layout complexity is prioritized over maximum frequency flexibility.
Si5341-A01879-GM	12-output, 48-QFN; higher channel count, lower jitter (175 fs RMS with embedded crystal); supports PCIe Gen5.	Suitable for next-gen systems requiring >8 outputs or sub-180 fs jitter, but larger footprint and higher cost.	Choose when scaling to 12-output clock trees or upgrading to PCIe Gen5 compliance is required.

Compared with SI5332DC08837-GM2R, Si5332DC08838-GM2R removes crystal layout risk but sacrifices input flexibility, while Si5341-A01879-GM adds output count and jitter margin at the cost of size and cost - making SI5332DC08837-GM2R optimal for balanced 8-output industrial and networking designs.

Availability

SI5332DC08837-GM2R is available at Aetrix Electronics and suitable for Ethernet switches, server clock distribution, and broadcast video equipment requiring stable component supply, long-term lifecycle support, and factory-programmed reliability.

Supply support for SI5332DC08837-GM2R 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

Silicon Labs is a fabless semiconductor company specializing in timing, wireless, and IoT solutions, with headquarters in Austin, Texas and global design centers.

The Si5332 family was designed to replace multiple fixed-frequency clock sources with a single programmable, low-jitter generator for high-speed data infrastructure - targeting servers, networking, and professional video applications.

FAQ

What is the crystal requirement for SI5332DC08837-GM2R?

The SI5332DC08837-GM2R requires an external 16–50 MHz fundamental-mode crystal connected to XA/XB pins. It does not include an embedded crystal - unlike Si5332E/F/G/H variants. Recommended crystals have ±20 ppm stability and 8–12 pF load capacitance, with internal CL configurable from 2–30 pF via register settings per the Si5332 datasheet Section 3.4.1.

Does SI5332DC08837-GM2R support PCIe Gen4 compliance?

Yes, SI5332DC08837-GM2R supports PCIe Gen4 compliance with 190 fs RMS phase jitter (12 kHz–20 MHz) using an external crystal, meeting the PCIe Gen4 SRIS (Scalable Reliable Interconnect Specification) jitter limit of ≤250 fs RMS. Its output frequency plan, spread spectrum capability, and deterministic skew control further ensure reliable link training and stability.

How many independent voltage domains does SI5332DC08837-GM2R support?

SI5332DC08837-GM2R supports six independent VDDO supply domains (VDDO0–VDDO5), each configurable for 1.5 V, 1.8 V, 2.5 V, or 3.3 V. This enables mixed-signal interfacing - for example, powering LVDS outputs at 2.5 V while driving LVCMOS clocks at 1.8 V on separate banks - without external level shifters or regulators.

Can SI5332DC08837-GM2R be reprogrammed after soldering?

Yes, SI5332DC08837-GM2R supports in-circuit programming via its I²C interface (SCLK/SDATA pins). While factory-programmed with a ClockBuilder Pro configuration, registers can be updated dynamically for frequency changes, output enable/disable, or spread spectrum activation - provided the host processor has I²C access and appropriate firmware.

What is the maximum differential output frequency supported by SI5332DC08837-GM2R?

The SI5332DC08837-GM2R supports differential output frequencies from 5 MHz to 333.33 MHz. This range covers key standards including 100 MHz (PCIe), 125 MHz (SGMII), 156.25 MHz (XAUI/CPRI), 312.5 MHz (25G Ethernet), and 333.33 MHz (DDR5 reference), all achievable with integer or fractional synthesis and <200 fs RMS jitter.

SI5332DC08837-GM2R Specifications

Product attributes: Attribute value

Manufacturer:: Skyworks Solutions Inc.

Series:: *

Package/Case:: -

Packaging:: Tape & Reel (TR)

Product Status:: Not For New Designs

Programmable:: Not Verified

Type:: -

PLL:: -

Input:: -

Output:: -

Number of Circuits:: -

Ratio - Input:Output:: -

Differential - Input:Output:: -

Frequency - Max:: -

Divider/Multiplier:: -

Voltage - Supply:: -

Operating Temperature:: -

Mounting Type:: -

Grade:: -

Qualification:: -

Supplier Device Package:: -

SI5332DC08837-GM2R FAQ

1.How can I place an order for SI5332DC08837-GM2R through Aetrix?

Please submit a Request for Quotation (RFQ) for SI5332DC08837-GM2R 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 SI5332DC08837-GM2R reliable?

The price and inventory of SI5332DC08837-GM2R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI5332DC08837-GM2R is usually 5 days.

3.What payment methods are accepted for SI5332DC08837-GM2R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI5332DC08837-GM2R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI5332DC08837-GM2R?

SI5332DC08837-GM2R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI5332DC08837-GM2R 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 SI5332DC08837-GM2R?

For technical support, including SI5332DC08837-GM2R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI5332DC08837-GM2R requirements.

6.How does Aetrix verify that SI5332DC08837-GM2R is sourced from the original manufacturer or authorized distributors?

All SI5332DC08837-GM2R 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 SI5332DC08837-GM2R meets industry standards.

7.What is the process for return or replacement of SI5332DC08837-GM2R?

All SI5332DC08837-GM2R units undergo pre-shipment inspection (PSI). If there is an issue with SI5332DC08837-GM2R, 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 SI5332DC08837-GM2R part is unused and in its original packaging.

Return procedure for SI5332DC08837-GM2R:

1.Submit a request within 90 days.

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

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