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

Skyworks Solutions Inc. SI5332BC08478-GM3R

Name: SI5332BC08478-GM3R
Brand: Skyworks Solutions Inc.
SKU: SI5332BC08478-GM3R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI5332BC08478-GM3R

Manufacturer:: Skyworks Solutions Inc.

Category:: Clock Generators, PLLs, Frequency Synthesizers

Package:: -

Datasheet:: SI5332BC08478-GM3R.pdf

Description:: IC CLOCK GENERATOR QFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SI5332BC08478-GM3R from Silicon Labs is a 12-output, factory-programmed, any-frequency clock generator with MultiSynth™ fractional synthesis, delivering 190 fs RMS phase jitter (external crystal), 5–333.33 MHz differential output range, and user-configurable LVDS/LVPECL/HCSL/LVCMOS signal formats per output. It serves as a single-chip clock tree solution in high-speed networking and server timing systems.

For engineers reviewing the SI5332BC08478-GM3R datasheet, SI5332BC08478-GM3R pinout, SI5332BC08478-GM3R application, or SI5332BC08478-GM3R equivalent, key selection considerations include its 48-pin QFN package, embedded configuration for PCIe Gen4/SRIS compliance, 12-differential-output capability with independent VDDO banks, and I²C programmability for field updates.

Technical Context

The SI5332BC08478-GM3R implements a two-stage synthesis architecture: a wideband PLL locks to an external 16–50 MHz crystal (XA/XB), then feeds up to three independent MultiSynth fractional dividers and five integer dividers. Its cross-point mux routes any synthesized frequency to any of twelve differential outputs.

All 12 outputs are grouped into four voltage-isolated banks (A–D), each with shared VDDO supply pins supporting 1.8 V/2.5 V/3.3 V differential logic. Each output supports configurable skew (±122.5 ps in 35 ps steps), synchronous enable/disable, and selectable spread spectrum (down or center, 0.1–2.5% at 30–33 kHz).

Key Specifications

Parameter	Value and Actual Design Meaning
Output Count	12 differential clock outputs (Si5332-GM3 variant); enables full clock tree replacement in multi-protocol systems.
Phase Jitter (RMS)	190 fs (12 kHz–20 MHz integration band, external crystal); meets PCIe Gen4 SRIS and SONET OC-192 requirements.
Output Frequency Range	Differential: 5–333.33 MHz; supports Ethernet 10G/25G/100G, CPRI, and SyncE line rates.
Synthesis Accuracy	0 ppm frequency error; eliminates manual trimming and guarantees exact target frequencies across temperature.
Input Reference	External crystal (16–50 MHz on XA/XB); no embedded crystal - matches Si5332B grade specification.
Supply Voltages	VDD core: 1.8/2.5/3.3 V; VDDO banks: 1.8/2.5/3.3 V (differential), enabling mixed-voltage board designs.
Interface	I²C (400 kHz standard mode); allows host MCU reconfiguration without firmware update or power cycle.

Pinout & Package

SI5332BC08478-GM3R uses a 6×6 mm, 48-pin QFN package (RoHS-6 compliant) with exposed thermal pad. Pin functions align with the Si5332-GM3 48-QFN layout: six VDDO pins (VDDO0–VDDO5) power four output banks, seven universal hardware input pins (IN1–IN7) support OE, spread-spectrum enable, or input selection, and dedicated XTAL pins (XA/XB) accept external 16–50 MHz crystals.

Pin/Terminal	Circuit Role	Design Meaning
XA / XB	Crystal oscillator input	Connects to fundamental-mode 16–50 MHz crystal; internal load capacitance configurable via register (2–30 pF).
VDDO0–VDDO5	Output bank supply	Each powers one or more differential outputs (e.g., VDDO0 → OUT0/OUT0b); enables independent voltage domains per bank.
OUT0–OUT11, OUT0b–OUT11b	Differential clock outputs	Twelve fully independent pairs; each pair supports LVDS/LVPECL/HCSL/LVCMOS format and 35-ps-step skew control.
IN1–IN7	Universal hardware input	Configurable in ClockBuilder Pro as OE#, CLKIN_SEL[1:0], SS_EN#, or I²C address select - no fixed function.
SCLK / SDATA	I²C serial interface	Standard bidirectional I²C bus (400 kHz max); supports in-system reprogramming and runtime profile switching.

Key Features

Feature	Design Value
MultiSynth™ fractional synthesis	Enables any-frequency generation up to 250 MHz on any output with zero ppm error - eliminates discrete crystal oscillators.
Cross-point mux architecture	Routes any MultiSynth or integer divider output to any differential output pair - maximizes routing flexibility in dense PCB layouts.
Four isolated VDDO banks	Supports simultaneous 1.8 V LVDS, 2.5 V LVPECL, and 3.3 V HCSL outputs - removes level-shifter ICs in mixed-interface systems.
Synchronous output disable	Prevents runt pulses by disabling drivers only at clock-edge boundaries - critical for glitch-free hot-swap and power management.
Programmable spread spectrum	Reduces EMI peak emissions by ±0.1–2.5% modulation at 30–33 kHz - meets FCC Class B without added shielding or ferrites.

Applications

100G Ethernet Switch Timing	PCIe Gen4 Server Clocking
Use Scenario: High-density data center switch ASICs requiring multiple synchronized clocks for SerDes lanes, packet processors, and memory controllers. IC Role / Device Role / Timing Role: Primary clock generator providing 12 precisely aligned, low-jitter clocks (100.00 MHz, 156.25 MHz, 312.5 MHz) from single crystal reference. Use Value: Replaces 4–6 discrete oscillators and fanout buffers; reduces BOM count, layout area, and jitter accumulation across clock domains.	Use Scenario: Dual-CPU server motherboards needing PCIe Gen4 reference clocks (100 MHz), CPU interconnect clocks (133.33 MHz), and DDR4 memory clocks (1200 MHz DDR rate). IC Role / Device Role / Timing Role: Single-device clock tree synthesizer meeting PCIe Gen4 SRIS spec (190 fs RMS jitter) and Intel VR ready timing requirements. Use Value: Eliminates need for separate PCIe clock buffer + CPU clock generator + memory clock IC - simplifies validation and improves system-level jitter margin.
Broadcast Video Synchronization	5G Small Cell Baseband
Use Scenario: SMPTE ST 2059-2 compliant video routers and IP media gateways requiring genlock-capable 27 MHz, 74.25 MHz, and 148.5 MHz clocks. IC Role / Device Role / Timing Role: Master timing source with selectable input reference (crystal or external sync pulse) and sub-100 ps inter-output skew. Use Value: Enables frame-accurate video switching across 12 independent processing paths without external delay-matching networks.	Use Scenario: 5G NR small cell units requiring CPRI/OBSAI-compatible clocks (30.72 MHz, 61.44 MHz, 122.88 MHz) plus fronthaul synchronization (1588 PTP clock recovery). IC Role / Device Role / Timing Role: Dual-role timing IC: generates baseband clocks and recovers IEEE 1588 time-of-day from packetized sync streams. Use Value: Integrates timing for both physical layer and network layer - reduces component count and latency between RF and MAC layers.

100G Ethernet Switch Timing

PCIe Gen4 Server Clocking

Use Scenario: High-density data center switch ASICs requiring multiple synchronized clocks for SerDes lanes, packet processors, and memory controllers.

IC Role / Device Role / Timing Role: Primary clock generator providing 12 precisely aligned, low-jitter clocks (100.00 MHz, 156.25 MHz, 312.5 MHz) from single crystal reference.

Use Value: Replaces 4–6 discrete oscillators and fanout buffers; reduces BOM count, layout area, and jitter accumulation across clock domains.

Use Scenario: Dual-CPU server motherboards needing PCIe Gen4 reference clocks (100 MHz), CPU interconnect clocks (133.33 MHz), and DDR4 memory clocks (1200 MHz DDR rate).

IC Role / Device Role / Timing Role: Single-device clock tree synthesizer meeting PCIe Gen4 SRIS spec (190 fs RMS jitter) and Intel VR ready timing requirements.

Use Value: Eliminates need for separate PCIe clock buffer + CPU clock generator + memory clock IC - simplifies validation and improves system-level jitter margin.

Broadcast Video Synchronization

5G Small Cell Baseband

Use Scenario: SMPTE ST 2059-2 compliant video routers and IP media gateways requiring genlock-capable 27 MHz, 74.25 MHz, and 148.5 MHz clocks.

IC Role / Device Role / Timing Role: Master timing source with selectable input reference (crystal or external sync pulse) and sub-100 ps inter-output skew.

Use Value: Enables frame-accurate video switching across 12 independent processing paths without external delay-matching networks.

Use Scenario: 5G NR small cell units requiring CPRI/OBSAI-compatible clocks (30.72 MHz, 61.44 MHz, 122.88 MHz) plus fronthaul synchronization (1588 PTP clock recovery).

IC Role / Device Role / Timing Role: Dual-role timing IC: generates baseband clocks and recovers IEEE 1588 time-of-day from packetized sync streams.

Use Value: Integrates timing for both physical layer and network layer - reduces component count and latency between RF and MAC layers.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SI5332BC08478-GM2R	8-output, 40-pin QFN; identical silicon revision and NVM configuration but fewer outputs and reduced pin count.	Suitable for cost-sensitive 8-output designs (e.g., mid-tier switches); lacks Bank C/D outputs and two VDDO pins.	Select when 12 outputs are unnecessary and PCB space/layout complexity must be minimized.
SI5338AC08478-GM	4-output, non-fractional clock generator; uses older MultiSynth architecture with higher jitter (350 fs RMS) and no spread spectrum.	Limited to fixed-ratio integer synthesis; cannot generate arbitrary frequencies like SI5332BC08478-GM3R.	Choose only for legacy designs where pin compatibility and lower cost outweigh jitter and flexibility requirements.

Compared with SI5332BC08478-GM2R, the SI5332BC08478-GM3R adds four outputs and two VDDO banks for expanded multi-voltage support; versus SI5338AC08478-GM, it delivers 160 fs lower jitter, fractional synthesis, and spread spectrum - making it essential for PCIe Gen4 and 100G+ systems.

Availability

SI5332BC08478-GM3R is available at Aetrix Electronics and suitable for 100G Ethernet switches, PCIe Gen4 servers, broadcast video infrastructure, and 5G small cell baseband requiring stable component supply, long-term lifecycle assurance, and factory-programmed reliability.

Supply support for SI5332BC08478-GM3R 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 over 20 years of leadership in high-performance clock technology and programmable oscillators.

The SI5332 family was designed to replace multiple discrete clock sources in high-speed communications equipment, offering single-chip programmability, ultra-low jitter, and mixed-signal flexibility for next-generation networking and computing platforms.

FAQ

What is the factory-programmed configuration of SI5332BC08478-GM3R?

The SI5332BC08478-GM3R is pre-programmed using ClockBuilder Pro with a unique NVM configuration (NVM code 08478) that defines its output frequencies, signal formats, VDDO assignments, and spread spectrum settings. This eliminates the need for initial I²C programming - the device powers up with fully functional clocks immediately after power-on reset.

Does SI5332BC08478-GM3R support PCIe Gen4 SRIS compliance?

Yes, SI5332BC08478-GM3R delivers 190 fs RMS phase jitter (12 kHz–20 MHz) with external crystal reference, meeting the PCI-SIG SRIS specification for PCIe Gen4 root complex and endpoint timing. Its low jitter floor and deterministic skew control ensure reliable link training and bit-error-rate performance at 16 GT/s.

Can SI5332BC08478-GM3R generate both integer and fractional output frequencies?

Yes, SI5332BC08478-GM3R supports both integer and fractional synthesis modes. Its MultiSynth™ engine enables exact generation of non-integer-related frequencies (e.g., 122.88 MHz, 155.52 MHz) on any output up to 250 MHz, while integer dividers handle higher frequencies up to 333.33 MHz - all with zero ppm error.

What package and thermal characteristics does SI5332BC08478-GM3R have?

SI5332BC08478-GM3R uses a 6×6 mm, 48-pin QFN package (GM3 suffix) with exposed thermal pad. Its θ_JA is 36 °C/W (JEDEC standard board), and maximum junction temperature is +125 °C. The package supports reflow soldering per IPC/JEDEC J-STD-020 and is rated for –40 to +85 °C ambient operation.

How many independent voltage domains does SI5332BC08478-GM3R support for its outputs?

SI5332BC08478-GM3R supports four independent VDDO voltage domains (Bank A–D), each powered by dedicated VDDO pins (VDDO0–VDDO5). This allows simultaneous operation of LVDS (1.8 V), LVPECL (2.5 V), and HCSL (3.3 V) outputs - eliminating external level shifters in mixed-interface timing architectures.

SI5332BC08478-GM3R 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:: -

SI5332BC08478-GM3R FAQ

1.How can I place an order for SI5332BC08478-GM3R through Aetrix?

Please submit a Request for Quotation (RFQ) for SI5332BC08478-GM3R 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 SI5332BC08478-GM3R reliable?

The price and inventory of SI5332BC08478-GM3R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI5332BC08478-GM3R is usually 5 days.

3.What payment methods are accepted for SI5332BC08478-GM3R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI5332BC08478-GM3R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI5332BC08478-GM3R?

SI5332BC08478-GM3R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI5332BC08478-GM3R 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 SI5332BC08478-GM3R?

For technical support, including SI5332BC08478-GM3R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI5332BC08478-GM3R requirements.

6.How does Aetrix verify that SI5332BC08478-GM3R is sourced from the original manufacturer or authorized distributors?

All SI5332BC08478-GM3R 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 SI5332BC08478-GM3R meets industry standards.

7.What is the process for return or replacement of SI5332BC08478-GM3R?

All SI5332BC08478-GM3R units undergo pre-shipment inspection (PSI). If there is an issue with SI5332BC08478-GM3R, 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 SI5332BC08478-GM3R part is unused and in its original packaging.

Return procedure for SI5332BC08478-GM3R:

1.Submit a request within 90 days.

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

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