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Skyworks Solutions Inc. SI5332AC08966-GM1
- Part No.:
- SI5332AC08966-GM1
- Manufacturer:
- Skyworks Solutions Inc.
- Package:
- -
- Datasheet:
-
SI5332AC08966-GM1.pdf
- Description:
- IC CLOCK GENERATOR QFN
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Inventory:2,691
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Product details
Overview
SI5332AC08966-GM1 from Silicon Labs is a 6-output, 32-pin QFN programmable clock generator with MultiSynth™ fractional synthesis, delivering 190 fs RMS phase jitter (external crystal), 5–333.33 MHz differential output frequency range, and support for LVDS/LVPECL/HCSL/LVCMOS signal formats per output. It serves as a single-chip clock tree solution in Ethernet switches and storage controllers requiring precise, multi-voltage timing.
For engineers reviewing the SI5332AC08966-GM1 datasheet, SI5332AC08966-GM1 pinout, SI5332AC08966-GM1 application, or SI5332AC08966-GM1 equivalent, key selection criteria include its 6-differential-output capability, external 16–50 MHz crystal interface, independent VDDO per output bank, I²C programmability, and PCIe Gen4/SRIS compliance - all validated for industrial temperature operation (–40 to +85 °C).
Technical Context
The SI5332AC08966-GM1 implements a two-stage synthesis architecture: a wideband PLL locks to an external 16–50 MHz crystal (XA/XB pins), then feeds up to three independent MultiSynth fractional dividers and five integer dividers. Its cross-point mux routes any synthesized or reference source to any of six differential outputs.
Each output supports user-configurable format (LVDS/LVPECL/HCSL/LVCMOS), skew adjustment (±245 ps in 35 ps steps), and synchronous enable/disable. Input selection is configurable via register or two universal HW pins (CLKIN_SEL[1:0]), and spread spectrum (down/center, 0.1–2.5%) is supported per MultiSynth path.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output count | 6 differential clock outputs (12 LVCMOS possible), each with dedicated VDDO supply pin |
| Jitter (RMS) | 190 fs RMS (measured at 12 kHz–20 MHz offset, external crystal reference) |
| Frequency range | Differential outputs: 5–333.33 MHz; supports integer and fractional synthesis up to 250 MHz |
| Input reference | External crystal: 16–50 MHz on XA/XB; no embedded crystal (Si5332A variant) |
| Supply voltages | VDD core: 1.8/2.5/3.3 V; VDDO per output: 1.5/1.8/2.5/3.3 V (LVCMOS) or 1.8/2.5/3.3 V (differential) |
| Interface | I²C serial interface (SCLK/SDATA); factory-programmed NVM enables power-up default configuration |
| Temp range | –40 to +85 °C industrial grade, RoHS-6 compliant |
Pinout & Package
SI5332AC08966-GM1 uses a 32-pin QFN package (5 mm × 5 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined per the Si5332A 32-QFN pinout in the official datasheet (Rev. 1.1, Section 6.3). All pins support 1.8 V / 2.5 V / 3.3 V logic levels unless specified otherwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| XA, XB | Crystal oscillator input | Connects to external 16–50 MHz fundamental-mode crystal; internal load capacitance configurable (2–30 pF) or disabled |
| CLKIN_2, CLKIN_2# | Differential reference input | Accepts LVPECL/LVDS/HCSL clock (10–250 MHz); used for synchronous mode or backup reference |
| OUT0–OUT5, OUT0b–OUT5b | Differential clock outputs | 6 fully independent differential pairs; each pair supports format selection and skew tuning (±245 ps) |
| VDDO0–VDDO5 | Output driver supply | Individual 1.5/1.8/2.5/3.3 V supplies per output bank - enables mixed-voltage system interfacing |
| SCLK, SDATA | I²C interface | Standard 2-wire serial bus (up to 400 kHz) for in-system configuration and register access |
| OEb | Hardware output enable | Active-low global enable; disables all outputs synchronously without runt pulses |
| Input1–Input5 | Universal hardware pins | Configurable in ClockBuilder Pro as OE, spread-spectrum enable, input select, or I²C address |
Key Features
| Feature | Design Value |
|---|---|
| MultiSynth™ fractional synthesis | Enables any-frequency generation (5–333.33 MHz) on all 6 outputs with zero ppm synthesis error |
| Cross-point mux architecture | Routes any of three MultiSynth paths or five integer dividers to any output - maximizes routing flexibility |
| Per-output signal format control | Each differential pair independently configurable as LVDS, LVPECL, HCSL, or LVCMOS - eliminates level-shifting ICs |
| Programmable output skew | Adjustable ±245 ps in 35 ps increments per differential pair - enables precise timing alignment across FPGAs or SerDes lanes |
| Multi-profile NVM storage | Stores up to 16 complete configurations; enables glitchless on-the-fly frequency switching between profiles |
Applications
| Server Clock Distribution | Ethernet Switch Timing |
|---|---|
Use Scenario: Generating synchronized clocks for CPU, memory, PCIe Gen4, and NIC interfaces within a 1U rack server. IC Role / Device Role / Timing Role: Primary clock generator providing 6 low-jitter differential clocks (e.g., 100 MHz PCIe REFCLK, 125 MHz Ethernet PHY, 133.33 MHz DDR4) from one crystal reference. Use Value: Replaces 3–4 discrete oscillators and buffers; reduces BOM count and board area while maintaining <200 fs jitter for PCIe Gen4 compliance. | Use Scenario: Driving multiple line cards and switch fabric ASICs in a modular Layer 3 Ethernet switch with IEEE 1588 PTP support. IC Role / Device Role / Timing Role: Central timing hub delivering 125 MHz SGMII, 156.25 MHz XAUI, and 250 MHz SerDes reference clocks with matched skew across ports. Use Value: Independent VDDO per output allows simultaneous 1.8 V (ASIC core) and 3.3 V (PHY interface) supplies; skew tuning aligns clock edges across 16+ PHYs. |
| Storage Controller Timing | Industrial Embedded Computing |
Use Scenario: Providing reference clocks for NVMe SSD controllers, SAS expanders, and RAID-on-chip engines in enterprise storage arrays. IC Role / Device Role / Timing Role: Generates 100 MHz PCIe Gen3, 125 MHz SATA, and 200 MHz SAS clocks with deterministic phase relationships. Use Value: Fractional synthesis eliminates need for multiple crystals; 190 fs jitter ensures <1 ns timing margin for high-speed serial links under thermal stress. | Use Scenario: Supplying clocks to ARM-based SoM, FPGA I/O banks, and industrial Ethernet PHYs in ruggedized edge computing gateways. IC Role / Device Role / Timing Role: Single-device clock source for heterogeneous voltage domains: 1.8 V FPGA transceivers, 3.3 V RS-485 UARTs, and 2.5 V Gigabit PHYs. Use Value: Five universal HW pins enable field-selectable configurations (e.g., spread-spectrum ON/OFF, input failover) without firmware update. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable clock generator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si5332BC08966-GM1 | Same 6-output 32-QFN package but Si5332B variant: max 200 MHz output frequency (vs. 333.33 MHz), integer-only synthesis mode | Limited to lower-frequency applications (e.g., 100/125 MHz Ethernet only); not suitable for PCIe Gen4 (100 MHz REFCLK with tight jitter budget) | Select only if output frequencies ≤200 MHz and fractional synthesis is unnecessary |
| Si5338AC08966-GM1 | 4-output, 24-QFN clock generator; lower integration, no cross-point mux, max 250 MHz output, 215 fs RMS jitter | Fewer outputs and less flexible routing; lacks per-output skew control and multi-profile NVM; simpler configuration | Choose when system requires only 4 clocks and cost-sensitive design prioritizes smaller footprint over configurability |
Compared with Si5332BC08966-GM1 and Si5338AC08966-GM1, the SI5332AC08966-GM1 uniquely supports full 333.33 MHz operation with fractional synthesis and per-output skew tuning - critical for PCIe Gen4 and multi-ASIC synchronization where timing margin is constrained.
Availability
SI5332AC08966-GM1 is available at Aetrix Electronics and suitable for Ethernet switches, storage controllers, and industrial embedded computing applications requiring stable component supply, long-term lifecycle assurance, and factory-programmed configuration traceability.
Supply support for SI5332AC08966-GM1 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 leadership in low-jitter clock technology and configurable mixed-signal ICs.
The Si5332 family was designed to replace multiple fixed-frequency oscillators and clock buffers with a single programmable device - targeting high-density, multi-protocol systems in data center, networking, and industrial automation.
FAQ
What is the maximum output frequency supported by the SI5332AC08966-GM1?
The SI5332AC08966-GM1 supports differential output frequencies from 5 MHz to 333.33 MHz. This upper limit applies to integer-mode synthesis; fractional synthesis is rated up to 250 MHz. The 333.33 MHz capability enables direct generation of common high-speed SerDes reference clocks such as PCIe Gen4 (100 MHz), 25G Ethernet (312.5 MHz), and CPRI (307.2 MHz), all while maintaining 190 fs RMS jitter performance using an external crystal reference.
Does the SI5332AC08966-GM1 include an embedded crystal?
No, the SI5332AC08966-GM1 does not include an embedded crystal. As indicated by the "A" suffix in the part number (Si5332A), it is configured for external crystal operation on pins XA/XB (16–50 MHz fundamental-mode crystal). Embedded crystal variants are designated Si5332E/F/G/H. The SI5332AC08966-GM1 relies on an external crystal for free-run mode and supports differential clock inputs (CLKIN_2/CLKIN_2#) for synchronous operation.
How many independent power supplies does the SI5332AC08966-GM1 support for its outputs?
The SI5332AC08966-GM1 provides six dedicated VDDO pins (VDDO0 through VDDO5), one for each differential output pair. Each VDDO pin can be independently set to 1.5 V, 1.8 V, 2.5 V, or 3.3 V for LVCMOS outputs, or 1.8 V, 2.5 V, or 3.3 V for differential outputs. This enables true mixed-supply operation - for example, driving 1.8 V FPGA transceivers and 3.3 V legacy PHYs simultaneously from a single SI5332AC08966-GM1 device.
Can the SI5332AC08966-GM1 generate spread spectrum clocking?
Yes, the SI5332AC08966-GM1 supports both down-spread and center-spread spectrum modulation from 0.1% to 2.5% in 0.01% steps at 30–33 kHz. Spread spectrum can be enabled via I²C register write or by assigning one of the five universal hardware input pins (Input1–Input5) as a spread-enable control in ClockBuilder Pro. Each MultiSynth path can be independently modulated, allowing selective EMI reduction on specific clock domains without affecting others.
Is the SI5332AC08966-GM1 pin-compatible with other Si5332 variants like GM2 or GM3?
No, the SI5332AC08966-GM1 (32-pin QFN) is not pin-compatible with Si5332-GM2 (40-pin QFN) or Si5332-GM3 (48-pin QFN). The 32-pin package has fewer output, VDDO, and HW input pins - specifically, five universal HW inputs versus seven in GM2/GM3, and no Bank C/D VDDO pins. PCB layout, land pattern, and signal routing must be redesigned when migrating between GM1/GM2/GM3 packages; only the core functionality and register map remain consistent across the Si5332 family.
SI5332AC08966-GM1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tray
- 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:
- -
SI5332AC08966-GM1 FAQ
1.How can I place an order for SI5332AC08966-GM1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI5332AC08966-GM1 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 SI5332AC08966-GM1 reliable?
The price and inventory of SI5332AC08966-GM1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI5332AC08966-GM1 is usually 5 days.
3.What payment methods are accepted for SI5332AC08966-GM1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI5332AC08966-GM1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI5332AC08966-GM1?
SI5332AC08966-GM1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI5332AC08966-GM1 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 SI5332AC08966-GM1?
For technical support, including SI5332AC08966-GM1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI5332AC08966-GM1 requirements.
6.How does Aetrix verify that SI5332AC08966-GM1 is sourced from the original manufacturer or authorized distributors?
All SI5332AC08966-GM1 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 SI5332AC08966-GM1 meets industry standards.
7.What is the process for return or replacement of SI5332AC08966-GM1?
All SI5332AC08966-GM1 units undergo pre-shipment inspection (PSI). If there is an issue with SI5332AC08966-GM1, 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 SI5332AC08966-GM1 part is unused and in its original packaging.
Return procedure for SI5332AC08966-GM1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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