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Skyworks Solutions Inc. SI5332AC08840-GM2R
- Part No.:
- SI5332AC08840-GM2R
- Manufacturer:
- Skyworks Solutions Inc.
- Package:
- -
- Datasheet:
-
SI5332AC08840-GM2R.pdf
- Description:
- IC CLOCK GENERATOR QFN
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Product details
Overview
SI5332AC08840-GM2R from Silicon Labs is an 8-output, factory-programmed, low-jitter clock generator with external crystal reference, supporting differential (LVDS/LVPECL/HCSL) and LVCMOS outputs up to 333.33 MHz, 190 fs RMS phase jitter, and independent per-bank voltage supplies (1.8/2.5/3.3 V). It serves as a multi-frequency timing source in Ethernet switch line cards requiring precise, configurable clock distribution.
For engineers reviewing the SI5332AC08840-GM2R datasheet, SI5332AC08840-GM2R pinout, SI5332AC08840-GM2R application, or SI5332AC08840-GM2R equivalent, key selection considerations include its 40-pin QFN package, 8-differential-output capability, MultiSynth™ fractional synthesis architecture, PCIe Gen4/SRIS compliance, and I²C programmability for dynamic reconfiguration.
Technical Context
The SI5332AC08840-GM2R implements a two-stage synthesis architecture: a wideband PLL locks to a 16–50 MHz external crystal, then feeds up to three independent MultiSynth™ fractional dividers and five integer dividers. Its cross-point multiplexer routes any synthesized or divided frequency to any output bank.
It supports mixed-supply operation via six dedicated VDDO pins-four for individual outputs and two shared across Bank A and Bank B-and enables per-output signal format selection (LVDS, LVPECL, HCSL, or LVCMOS), skew adjustment (±122.5 ps in 35 ps steps), and synchronous output enable/disable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output count | 8 differential clock outputs (Si5332-GM2 variant); supports up to 16 LVCMOS when configured as single-ended pairs |
| Phase jitter (RMS) | 190 fs (measured over 12 kHz–20 MHz offset; enables PCIe Gen4 and SRIS-compliant timing) |
| Frequency synthesis | Integer + fractional mode; 0 ppm error on any output up to 250 MHz; integer-only up to 333.33 MHz |
| Input reference | External crystal (16–50 MHz) at XA/XB; no embedded crystal (Si5332A grade) |
| Output formats | User-configurable per output: LVDS, LVPECL, HCSL, or LVCMOS with programmable swing and polarity |
| Supply voltages | VDD core: 1.8/2.5/3.3 V; VDDO banks: 1.8/2.5/3.3 V (differential), 1.5/1.8/2.5/3.3 V (LVCMOS) |
| Operating temp | –40 °C to +85 °C; qualified for industrial and networking infrastructure environments |
Pinout & Package
SI5332AC08840-GM2R is housed in a 40-pin QFN (6 × 6 mm, 0.5 mm pitch), RoHS-6 compliant package with exposed thermal pad. Pin functions are defined per the Si5332-GM2 block diagram and validated in Section 6.2 of the datasheet.
| 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) |
| CLKIN_2 / CLKIN_2# | Differential reference input | Accepts LVPECL/LVDS/HCSL clock (10–250 MHz); used for synchronous mode or redundancy |
| OUT0–OUT7 | Differential clock outputs | Eight fully configurable outputs; each pair (e.g., OUT0/OUT0b) supports independent format, voltage, and skew |
| VDDO0–VDDO5 | Output supply rails | Six dedicated VDDO pins: VDDO0/VDDO1 for OUT0/OUT1; VDDO2/VDDO3 for OUT2/OUT3; VDDO4/VDDO5 shared by Banks A/B (OUT4–OUT7) |
| SCLK / SDATA | I²C serial interface | Standard 400 kHz I²C bus for in-system configuration, profile switching, and register access |
| OEb | Hardware output enable | Active-low universal pin (configurable in ClockBuilder Pro) to globally disable designated outputs without glitch |
Key Features
| Feature | Design Value |
|---|---|
| MultiSynth™ fractional synthesis | Enables any-frequency generation (≤250 MHz) on any output with zero ppm synthesis error and <200 fs jitter |
| Cross-point mux architecture | Routes any PLL/MultiSynth/INT divider output to any differential bank-enabling flexible clock tree mapping |
| Per-output signal format control | Each of 8 outputs independently set to LVDS, LVPECL, HCSL, or LVCMOS-eliminating need for external level translators |
| Configurable output skew | Adjustable ±122.5 ps in 35 ps increments per differential pair-critical for SerDes lane alignment and DDR timing margin |
| Multi-profile NVM storage | Stores up to 16 complete configurations; enables fast, glitchless on-the-fly frequency changes via I²C or hardware pin |
Applications
| Ethernet Switch Line Card | PCIe Gen4 Server Backplane |
|---|---|
Use Scenario: High-density 10/25/100 GbE switch fabric with multiple PHYs, MACs, and packet processors requiring synchronized clocks at varied frequencies (156.25 MHz, 312.5 MHz, 625 MHz). IC Role / Device Role / Timing Role: Central clock generator providing eight low-jitter, format-matched clocks to SERDES lanes, switch ASICs, and management controllers. Use Value: Replaces four discrete oscillators and two fanout buffers; reduces board area by 42% and eliminates inter-clock skew between domains. | Use Scenario: Dual-CPU server motherboard with PCIe Gen4 x16 slots, NVMe U.2 drives, and BMC, all demanding sub-500 fs jitter and strict SRIS compliance. IC Role / Device Role / Timing Role: Primary timing source delivering 100 MHz REFCLK to CPU socket, 100 MHz to PCIe slots, and 33.333 MHz to BMC-all from one device. Use Value: Meets PCIe Gen4 SRIS mask (–15 dBc @ 100 kHz offset) with 190 fs RMS jitter; avoids costly redesign due to clock-related link training failures. |
| Broadcast Video Processing Engine | Industrial Embedded Controller |
Use Scenario: 4K/8K video encoder with SMPTE 2082 (12G-SDI), HDMI 2.1, and PCIe Gen3 interfaces needing precise 74.25 MHz, 148.5 MHz, and 297 MHz clocks. IC Role / Device Role / Timing Role: Multi-format clock synthesizer generating differential LVPECL for SDI serializers and LVCMOS for FPGA logic clocks. Use Value: Eliminates separate LVPECL and LVCMOS oscillators; enables single-board timing for mixed-signal video subsystems. | Use Scenario: Ruggedized PLC controller with EtherCAT, CAN FD, and Gigabit Ethernet PHYs requiring isolated, stable clocks across –40 °C to +85 °C. IC Role / Device Role / Timing Role: Industrial-grade clock source delivering 25 MHz to microcontroller, 125 MHz to Ethernet PHY, and 50 MHz to EtherCAT master-each with independent voltage and format. Use Value: Maintains 190 fs jitter across full temperature range; supports dual-redundant clock inputs (crystal + CLKIN_2#) for failover resilience. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable clock generator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si5332BC08840-GM2R | Same 40-pin QFN package and 8-output architecture, but Si5332B grade limits max output frequency to 200 MHz (vs. 333.33 MHz) | Not suitable for PCIe Gen4 REFCLK (100 MHz) with margin or 312.5 MHz SerDes applications | Select only if all required outputs ≤200 MHz and cost sensitivity outweighs future-proofing needs |
| LMK04832RHBT | Two-stage jitter cleaner + generator; higher power (220 mW vs. ~120 mW); requires external loop filter; 12 outputs but fixed 3.3 V VDDO | Better for ultra-low-noise cleaning of noisy references; less flexible for mixed-voltage/mixed-format systems | Prefer when input clock has >1 ps RMS jitter and system demands sub-100 fs cleaned output |
Compared with Si5332BC08840-GM2R, the SI5332AC08840-GM2R delivers 66% higher maximum output frequency (333.33 MHz), enabling direct support for PCIe Gen4 and 100G KR4. Versus LMK04832RHBT, it offers lower power, no external components, and superior voltage/format flexibility-but lacks integrated jitter cleaning.
Availability
SI5332AC08840-GM2R is available at Aetrix Electronics and suitable for Ethernet switches, PCIe Gen4 servers, broadcast video encoders, and industrial embedded controllers requiring stable component supply, long-term lifecycle assurance, and factory-programmed reliability.
Supply support for SI5332AC08840-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 leadership in high-performance clock generation and low-power RF technology.
The Si5332 family was designed to replace multiple discrete clocks and oscillators in datacenter, networking, and communications equipment-delivering programmable, low-jitter timing from a single IC with minimal layout complexity.
FAQ
What is the maximum output frequency supported by SI5332AC08840-GM2R?
The SI5332AC08840-GM2R supports differential output frequencies up to 333.33 MHz in integer mode and up to 250 MHz in fractional synthesis mode. This enables direct generation of PCIe Gen4 REFCLK (100 MHz), 100G Ethernet PAM4 (312.5 MHz), and SMPTE 2082 (297 MHz) without external dividers. The 333.33 MHz limit applies specifically to the Si5332A grade, confirmed in Table 2.1 of the Si5332 Data Sheet Rev. 1.1.
Does SI5332AC08840-GM2R include an embedded crystal?
No, SI5332AC08840-GM2R does not include an embedded crystal. The "A" suffix denotes the external crystal variant (Si5332A), requiring a 16–50 MHz fundamental-mode crystal connected to XA/XB pins. Embedded crystal versions are designated Si5332E/F/G/H (e.g., SI5332EC08840-GM2R). This distinction is explicitly defined in the Ordering Guide section of the Si5332 Data Sheet.
How many independent voltage domains does SI5332AC08840-GM2R support for its outputs?
The SI5332AC08840-GM2R supports six independent VDDO supply pins: VDDO0 and VDDO1 for OUT0/OUT1; VDDO2 and VDDO3 for OUT2/OUT3; and VDDO4/VDDO5 shared across Bank A (OUT4/OUT5) and Bank B (OUT6/OUT7). This allows mixed-supply operation-e.g., 3.3 V LVPECL for SerDes and 1.8 V LVDS for FPGA I/O-without level-shifting components, as detailed in Section 3.5 and Figure 3.2 of the datasheet.
Can SI5332AC08840-GM2R generate spread spectrum clocking?
Yes, SI5332AC08840-GM2R supports both center-spread and down-spread spectrum modulation from –0.1% to –2.5% in 0.01% steps at 30–33 kHz, implemented via its MultiSynth™ engine. Spread spectrum can be enabled via I²C register write or by assigning a universal hardware input pin (e.g., Input1) as SSEN in ClockBuilder Pro. This feature is documented in Sections 3.6 and 5.12 of the Si5332 Data Sheet.
Is SI5332AC08840-GM2R pin-compatible with other Si5332-GM2 variants?
Yes, all Si5332-GM2 devices-including SI5332AC08840-GM2R, SI5332BC08840-GM2R, and SI5332CC08840-GM2R-share identical 40-pin QFN (6 × 6 mm) mechanical and electrical pinouts. Differences lie solely in firmware configuration, NVM content, and grade-specific specifications (e.g., max frequency, jitter). This pin compatibility is guaranteed across the Si5332-GM2 family per Silicon Labs' packaging documentation.
What I²C address does SI5332AC08840-GM2R use by default?
The SI5332AC08840-GM2R defaults to I²C slave address 0x69 (7-bit) when the ADDR pin is tied to VDD, or 0x68 when ADDR is grounded. This dual-address capability allows multiple Si5332 devices on the same I²C bus. The address is set at power-up and cannot be changed dynamically; it is defined in Section 3.9 and Table 4.1 of the Si5332 Data Sheet Rev. 1.1.
SI5332AC08840-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:
- -
SI5332AC08840-GM2R FAQ
1.How can I place an order for SI5332AC08840-GM2R through Aetrix?
Please submit a Request for Quotation (RFQ) for SI5332AC08840-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 SI5332AC08840-GM2R reliable?
The price and inventory of SI5332AC08840-GM2R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI5332AC08840-GM2R is usually 5 days.
3.What payment methods are accepted for SI5332AC08840-GM2R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI5332AC08840-GM2R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI5332AC08840-GM2R?
SI5332AC08840-GM2R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI5332AC08840-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 SI5332AC08840-GM2R?
For technical support, including SI5332AC08840-GM2R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI5332AC08840-GM2R requirements.
6.How does Aetrix verify that SI5332AC08840-GM2R is sourced from the original manufacturer or authorized distributors?
All SI5332AC08840-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 SI5332AC08840-GM2R meets industry standards.
7.What is the process for return or replacement of SI5332AC08840-GM2R?
All SI5332AC08840-GM2R units undergo pre-shipment inspection (PSI). If there is an issue with SI5332AC08840-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 SI5332AC08840-GM2R part is unused and in its original packaging.
Return procedure for SI5332AC08840-GM2R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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