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Skyworks Solutions Inc. SI5351A-B02124-GM
- Part No.:
- SI5351A-B02124-GM
- Manufacturer:
- Skyworks Solutions Inc.
- Package:
- -
- Datasheet:
-
SI5351A-B02124-GM.pdf
- Description:
- IC CLOCK GENERATOR
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Inventory:4,534
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Product details
Overview
SI5351A-B02124-GM from Skyworks Solutions is an I²C-programmable 8-output CMOS clock generator with integrated VCXO, designed to replace crystals, crystal oscillators, and discrete PLLs in cost-sensitive embedded systems. It delivers up to eight independent, non-integer-related frequencies from 2.5 kHz to 200 MHz with 0 ppm synthesis error, operates from a 25/27 MHz crystal, and supports 1.8/2.5/3.3 V output voltage levels for mixed-signal timing in networking and audio/video equipment.
For engineers reviewing the SI5351A-B02124-GM datasheet, SI5351A-B02124-GM pinout, SI5351A-B02124-GM application, or SI5351A-B02124-GM equivalent, key selection criteria include its 20-QFN (4×4 mm) package with 20 pins, VCXO tuning capability (±240 ppm pull range), low period jitter (<70 ps pk-pk), I²C configurability, and support for HCSL-compatible swing and spread spectrum modulation.
Technical Context
The SI5351A-B02124-GM implements a dual-PLL architecture with one PLL dedicated to VCXO operation and the other supporting free-running or reference-synchronized synthesis. Its MultiSynth fractional dividers enable exact frequency generation per output without integer constraints, while crosspoint switching allows flexible routing of either PLL output to any of eight MultiSynth blocks.
It features separate core (VDD) and output (VDDOx) supply rails-supporting 2.5 V or 3.3 V core operation and independent 1.8/2.5/3.3 V output buffers-with excellent PSRR eliminating external filtering. Glitchless frequency transitions and programmable rise/fall times ensure clean signal integrity during dynamic reconfiguration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Outputs | 8 independent CMOS clock outputs with individual frequency, phase, and drive control |
| Frequency Range | 2.5 kHz to 200 MHz per output; two unique frequencies >112.5 MHz allowed simultaneously |
| Period Jitter | <70 ps pk-pk (all outputs active, 20-QFN package), enabling stable high-speed SerDes and PCIe Gen 1 timing |
| VCXO Pull Range | Configurable ±240 ppm at 3.3 V, replacing costly pullable crystals in synchronization-critical applications |
| I²C Interface | Standard/Fast Mode (100/400 kbps), enabling host MCU-based runtime reconfiguration without firmware update |
| Supply Voltages | VDD = 2.25–2.75 V or 3.0–3.6 V; VDDOx = 1.71–1.89 V / 2.25–2.75 V / 3.0–3.6 V - supports mixed-voltage SoC interfacing |
| Crystal Reference | 25 or 27 MHz AT-cut crystal only; internal load capacitance options (0/6/8/10 pF) reduce BOM count |
Pinout & Package
SI5351A-B02124-GM is housed in a 20-pin QFN package (4 mm × 4 mm, 0.5 mm pitch) with exposed thermal pad. The package supports fine-pitch PCB layout and efficient thermal dissipation (θJA = 41 °C/W on 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| XA, XB | Crytal oscillator input | Accepts 25/27 MHz fundamental-mode AT-cut crystal; internal load caps eliminate external components |
| CLK0–CLK7 | CMOS clock outputs | Eight configurable outputs; each supports independent frequency, phase offset, spread spectrum, and drive strength |
| VDDOA–VDDOD | Output buffer supplies | Four independent VDDO rails (each powers two outputs); enable mixed-voltage signaling (e.g., 1.8 V + 3.3 V outputs) |
| VDD | Core supply | Powers PLLs, logic, and I²C interface; must be powered before or concurrently with all VDDOx rails |
| SCL, SDA | I²C serial interface | Two-wire bus for configuration and status readback; supports 100/400 kbps with Schmitt-trigger inputs |
| OEB | Output enable bar | Active-low global output disable; enables power-aware clock gating without I²C transaction overhead |
| A0 | I²C address LSB | Configures device I²C address (0x60 or 0x61); allows multiple SI5351A-B02124-GM devices on same bus |
| VC | VCXO control voltage | Analog tuning input (0–VDD); enables ±240 ppm frequency adjustment with linear 18–150 ppm/V gain |
Key Features
| Feature | Design Value |
|---|---|
| 0 ppm frequency synthesis error | Eliminates cumulative timing drift across multiple clock domains, critical for multi-protocol SoCs |
| Glitchless frequency changes | Enables seamless clock rate switching during system operation (e.g., CPU DVFS or display refresh rate adaptation) |
| Configurable spread spectrum per output | Reduces EMI peak emissions by up to 15 dB without requiring external modulators or layout changes |
| Static phase offset control | Allows precise inter-output skew alignment (333 ps/step resolution) for DDR source-synchronous interfaces |
| Separate VDDO rails per output pair | Permits simultaneous 1.8 V, 2.5 V, and 3.3 V clock outputs to drive heterogeneous logic families on same board |
Applications
| Audio/Video Timing | Networking Equipment |
|---|---|
Use Scenario: Generating synchronized pixel clocks (74.25 MHz), audio sample rates (24.576 MHz), and HDMI TMDS clocks (125 MHz) in AV receivers and set-top boxes. IC Role / Device Role / Timing Role: Single-chip multi-domain clock source replacing four discrete oscillators and reducing board area by >60%. Use Value: Eliminates inter-clock jitter accumulation and ensures lip-sync accuracy across video/audio paths via deterministic phase relationships. | Use Scenario: Providing reference clocks for Ethernet PHYs (25/125 MHz), switch fabric controllers (156.25 MHz), and USB 3.0 transceivers (100 MHz) in residential gateways. IC Role / Device Role / Timing Role: Centralized clock generator with VCXO lock to upstream PTP grandmaster for IEEE 1588 time-aware networking. Use Value: Enables sub-microsecond time synchronization across LAN ports without external PLLs or OCXOs. |
| Industrial Instrumentation | Laser Rangefinding Systems |
Use Scenario: Delivering precise trigger clocks (10–100 MHz) and sampling clocks (1–50 MSPS) for handheld oscilloscopes and spectrum analyzers. IC Role / Device Role / Timing Role: Replaces fixed-frequency crystal oscillators and analog VCXOs with digitally tunable, software-configurable timing. Use Value: Allows field-upgradable clock plans and real-time calibration via I²C, reducing test fixture complexity and NRE costs. | Use Scenario: Generating high-stability time-of-flight measurement clocks (e.g., 125 MHz) and laser pulse modulation signals (10–50 MHz) in portable rangefinders. IC Role / Device Role / Timing Role: Low-jitter clock source synchronized to GPS-disciplined 1 PPS for absolute distance accuracy. Use Value: Achieves <1 mm distance resolution through <70 ps period jitter and sub-nanosecond phase alignment between transmit/receive paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar clock generator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si5351B-B-GM | Includes VCXO + CLKIN dual-reference capability; SI5351A-B02124-GM lacks CLKIN input | Required when synchronizing to external 10–100 MHz reference (e.g., GPS 1PPS-derived clock) | Select SI5351B-B-GM if external reference locking is needed; otherwise SI5351A-B02124-GM offers lower cost and simpler design |
| Si5341-A-GM | Higher-performance 10-output clock generator with <50 fs RMS jitter, JESD204B compliance, and integrated jitter cleaner | Targeted at high-speed data converters and RF sampling systems where sub-100 fs jitter is mandatory | Choose Si5341-A-GM only for JESD204B or RF sampling applications; SI5351A-B02124-GM suffices for PCIe Gen 1, USB, and Gigabit Ethernet |
Compared with SI5351B-B-GM, SI5351A-B02124-GM omits CLKIN support but retains full VCXO functionality and identical 8-output capability-making it optimal for crystal-referenced, cost-sensitive designs. Versus Si5341-A-GM, it trades ultra-low jitter for significantly lower price and simpler configuration, targeting mainstream embedded rather than high-end instrumentation.
Availability
SI5351A-B02124-GM is available at Aetrix Electronics and suitable for networking equipment, audio/video consumer electronics, and industrial instrumentation requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for SI5351A-B02124-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 wireless infrastructure, automotive, and industrial markets.
The Si5351 family was engineered to replace discrete timing components in cost-constrained, space-limited embedded systems-delivering programmable flexibility without sacrificing jitter performance or power efficiency.
FAQ
What is the maximum output frequency supported by the SI5351A-B02124-GM?
The SI5351A-B02124-GM supports output frequencies from 2.5 kHz to 200 MHz per channel. However, only two unique frequencies above 112.5 MHz may be generated simultaneously-e.g., 125 MHz and 150 MHz-but not three distinct values. This limitation arises from internal PLL bandwidth constraints and is documented in Table 7 of the Skyworks datasheet.
Does the SI5351A-B02124-GM require an external crystal?
Yes, the SI5351A-B02124-GM requires a 25 MHz or 27 MHz fundamental-mode AT-cut crystal connected to XA/XB pins. It does not support external clock input (CLKIN) or direct oscillator replacement without a crystal. Internal load capacitance options (0/6/8/10 pF) minimize or eliminate need for external capacitors.
Can the SI5351A-B02124-GM generate spread spectrum clocking on individual outputs?
Yes, the SI5351A-B02124-GM supports independent spread spectrum modulation on each of its eight outputs. Down-spread (–0.1% to –2.5%) or center-spread (±0.1% to ±1.5%) can be configured per output via I²C registers, with modulation rate fixed at 31.5 kHz. This reduces EMI without affecting functional timing margins.
What is the purpose of the VC pin on the SI5351A-B02124-GM?
On the SI5351A-B02124-GM, the VC pin serves as the VCXO control voltage input, enabling analog frequency tuning over ±240 ppm at 3.3 V supply. Unlike the Si5351C variant, this pin does not accept external clock signals-it exclusively adjusts the internal VCXO's output frequency in response to an analog control voltage applied externally.
How many independent voltage supplies does the SI5351A-B02124-GM support for its outputs?
The SI5351A-B02124-GM supports four independent output supply rails: VDDOA (CLK0/CLK1), VDDOB (CLK2/CLK3), VDDOC (CLK4/CLK5), and VDDOD (CLK6/CLK7). Each rail accepts 1.8 V, 2.5 V, or 3.3 V, allowing mixed-voltage clock distribution to diverse logic families without level shifters.
SI5351A-B02124-GM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- *
- Package/Case:
- -
- Packaging:
- Strip
- Product Status:
- Active
- 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:
- -
SI5351A-B02124-GM FAQ
1.How can I place an order for SI5351A-B02124-GM through Aetrix?
Please submit a Request for Quotation (RFQ) for SI5351A-B02124-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 SI5351A-B02124-GM reliable?
The price and inventory of SI5351A-B02124-GM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI5351A-B02124-GM is usually 5 days.
3.What payment methods are accepted for SI5351A-B02124-GM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI5351A-B02124-GM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI5351A-B02124-GM?
SI5351A-B02124-GM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI5351A-B02124-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 SI5351A-B02124-GM?
For technical support, including SI5351A-B02124-GM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI5351A-B02124-GM requirements.
6.How does Aetrix verify that SI5351A-B02124-GM is sourced from the original manufacturer or authorized distributors?
All SI5351A-B02124-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 SI5351A-B02124-GM meets industry standards.
7.What is the process for return or replacement of SI5351A-B02124-GM?
All SI5351A-B02124-GM units undergo pre-shipment inspection (PSI). If there is an issue with SI5351A-B02124-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 SI5351A-B02124-GM part is unused and in its original packaging.
Return procedure for SI5351A-B02124-GM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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