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Skyworks Solutions Inc. SI5518E-B15664-GMR
- Part No.:
- SI5518E-B15664-GMR
- Manufacturer:
- Skyworks Solutions Inc.
- Package:
- 72-VFQFN Exposed Pad
- Datasheet:
-
SI5518E-B15664-GMR.pdf
- Description:
- Linear IC's
- Quantity:
- Payment:
- Shipping:
Inventory:2,706
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Product details
Overview
SI5518E-B15664-GMR from Skyworks is a NetSync™ network synchronizer IC designed for IEEE 1588 Precision Time Protocol (PTP) applications in 5G radio units and small cells. It features four DSPLLs, <55 fs RMS jitter, 1PPS input support, and programmable loop bandwidth down to 1 mHz. The device delivers ultra-low phase noise outputs and supports Synchronous Ethernet (SyncE), ITU-T G.8273.2/T-BC, and G.8273.4 compliance.
For engineers reviewing the SI5518E-B15664-GMR datasheet, SI5518E-B15664-GMR pinout, SI5518E-B15664-GMR application, or SI5518E-B15664-GMR equivalent, key selection criteria include DSPLL count, 1PPS interface capability, ITU-T timing standard compliance, output format flexibility (LVPECL/LVDS/HCSL/CML/LVCMOS), and AccuTime™ software integration readiness.
Technical Context
The SI5518E-B15664-GMR implements Skyworks' fifth-generation DSPLL architecture with four independent digital PLLs, enabling simultaneous synchronization to multiple reference inputs including 1PPS and frequency-based clocks. Its MultiSynth-based synthesis engine supports fully programmable output frequencies up to 3.2 GHz with sub-picosecond phase step resolution.
It operates in synchronous, free-run, and holdover modes with automatic/manual hitless switching and pin- or software-controlled DCO (1 ppt/step). The device integrates dedicated hardware for IEEE 1588 servo functions and meets ITU-T G.8273.1 (T-GM), G.8273.2 (T-TSC, T-BC), and G.8273.4 (T-BC-P/A, T-TSC-P/A) requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Jitter (RMS) | <55 fs RMS - enables direct connection to high-speed SerDes without external jitter attenuator |
| DSPLL Count | 4 - supports multi-reference redundancy and hybrid timing architectures (e.g., SyncE + 1PPS) |
| Max Output Frequency | 3.2 GHz - covers CPRI/eCPRI, JESD204B/C, and 56G/112G PAM4 clocking needs |
| Min PLL Input Bandwidth | 1 mHz - provides ultra-deep wander filtering for telecom-grade holdover stability |
| Reference Inputs | 1PPS - enables precise phase alignment to GPS/GNSS time sources in boundary clock deployments |
| Output Formats | LVPECL, LVDS, HCSL, CML, LVCMOS - eliminates need for level-shifting buffers in mixed-signal systems |
| Standards Compliance | ITU-T G.8273.2 (T-TSC/T-BC), G.8273.4 (T-BC-P/A), G.8262 (EEC Option 1/2), G.8262.1 (eEEC) - certifies suitability for O-RAN fronthaul and metro edge timing applications |
Pinout & Package
The SI5518E-B15664-GMR is housed in a 72-pin QFN package (10 mm × 10 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignment follows Skyworks' standard NetSync™ layout optimized for signal integrity and thermal dissipation in dense RF front-end modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDIO_0–VDDIO_3 | IO Power Supply | Independent 1.8 V/2.5 V/3.3 V domains per output bank enable mixed-voltage system interfacing |
| CLKIN0–CLKIN5 | Reference Input | Supports differential (LVDS/LVPECL) or single-ended (LVCMOS) references including 1PPS on dedicated pins |
| CLKOUT0–CLKOUT17 | Timing Output | 18 configurable outputs with per-pin format, voltage, and slew rate control for multi-protocol clock distribution |
| SDA/SCL | I²C Interface | Two-wire serial bus for real-time configuration of DSPLL parameters, DCO tuning, and status monitoring |
| INTB | Interrupt Output | Open-drain indicator for loss-of-lock, holdover entry, or phase transient events requiring system-level response |
Key Features
| Feature | Design Value |
|---|---|
| Four DSPLLs with independent loop filters | Enables concurrent synchronization to SyncE, 1PPS, and auxiliary frequency references without cross-talk or shared-loop instability |
| Programmable DCO (1 ppt/step) | Provides traceable, software-controllable frequency/phase adjustment for IEEE 1588 servo loops without analog tuning components |
| AccuTime™ software integration | Reduces PTP stack development effort by offloading servo, filtering, and state machine logic to hardened silicon IP |
| Hitless switching with <30 ps phase transients | Maintains deterministic latency across reference switches-critical for fronthaul transport in O-RAN deployments |
| Ultra-low 1 mHz PLL bandwidth | Meets ITU-T G.8273.2 wander filtering requirements for T-BC operation in mobile backhaul networks |
Applications
| O-RAN Radio Unit (O-RU) | 5G Small Cell Base Station |
|---|---|
|
Use Scenario: Precise phase alignment between distributed antenna elements in massive MIMO arrays using CPRI/eCPRI interfaces. IC Role / Device Role / Timing Role: Boundary clock with dual-reference (SyncE + 1PPS) operation, providing jitter-cleaned, phase-coherent clocks to RFICs and ADC/DACs. Use Value: Enables sub-100 ns inter-antenna phase error tolerance required for beamforming accuracy at mmWave frequencies. |
Use Scenario: Synchronization of multi-band transceivers operating across FR1 and FR2 bands in compact outdoor small cell enclosures. IC Role / Device Role / Timing Role: Grandmaster clock generating JESD204B/C sampling clocks and baseband processing clocks with common timebase. Use Value: Eliminates need for discrete TCXOs and jitter cleaners, reducing BOM count and PCB area by >40% versus legacy solutions. |
| Fixed Wireless Access (FWA) Gateway | Private 5G Core Network Switch |
|
Use Scenario: Time synchronization of CPE gateways deployed in rural broadband infrastructure with GNSS-denied operation. IC Role / Device Role / Timing Role: Holdover-optimized slave clock maintaining ±50 ppb accuracy for >24 hours after 1PPS loss. Use Value: Meets ITU-T G.8273.2 Class C holdover specification, ensuring uninterrupted QoS during GPS jamming or outage. |
Use Scenario: Timing distribution across virtualized RAN (vRAN) servers and SmartNICs in enterprise private 5G deployments. IC Role / Device Role / Timing Role: IEEE 1588 transparent clock with hardware timestamping and packet delay measurement. Use Value: Achieves end-to-end time error <100 ns across 10+ hop network, satisfying URLLC latency SLAs for industrial automation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar network synchronizer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si5512E-B15662-GMR | 4 DSPLLs, 12 outputs, <55 fs RMS jitter, 1.228 GHz max output, 1PPS input only | Limited to lower-frequency applications (e.g., 25G Ethernet, CPRI Option 1/2); lacks 3.2 GHz capability for 112G PAM4 | Select when system requires fewer outputs and lower max frequency, prioritizing cost over future-proofing. |
| Si5401E-B15664-GMR | 3 DSPLLs, 10 outputs, <60 fs RMS jitter, 1.28 GHz max output, 1PPS + 8 kHz input support | Optimized for grandmaster roles in core/metro routers; includes 8 kHz E1/T1 reference support not present in SI5518E-B15664-GMR | Choose for centralized timing hubs where E1/T1 legacy interface compatibility is required alongside PTP. |
Compared with Si5512E-B15662-GMR and Si5401E-B15664-GMR, the SI5518E-B15664-GMR offers highest output frequency (3.2 GHz) and largest output count (18), making it uniquely suited for next-gen O-RU fronthaul with 112G PAM4 and multi-band carrier aggregation.
Availability
SI5518E-B15664-GMR is available at Aetrix Electronics and suitable for 5G radio unit design, O-RAN fronthaul deployment, and private 5G infrastructure requiring stable component supply, long-term lifecycle assurance, and full ITU-T compliance documentation.
Supply support for SI5518E-B15664-GMR 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, Inc. is a global leader in high-performance analog semiconductors, specializing in RF, timing, and connectivity solutions for wireless infrastructure, automotive, and industrial markets.
The SI5518E-B15664-GMR belongs to Skyworks' NetSync™ family of network synchronizers, engineered specifically to replace discrete timing chains in 5G RAN equipment while meeting stringent ITU-T G.8273.x and IEEE 1588 standards.
FAQ
What timing standards does the SI5518E-B15664-GMR support?
The SI5518E-B15664-GMR supports ITU-T G.8273.1 (T-GM), G.8273.2 (T-TSC, T-BC), G.8273.4 (T-BC-P/A, T-TSC-P/A), G.8262 (EEC Options 1 and 2), and G.8262.1 (eEEC). These certifications confirm its suitability for O-RAN fronthaul, mobile backhaul, and telecom boundary clock applications requiring strict wander and jitter performance.
Does the SI5518E-B15664-GMR require external crystal or reference oscillator?
No-the SI5518E-B15664-GMR integrates all necessary timing circuitry and operates with external reference inputs only (e.g., 1PPS, SyncE, or frequency references). It does not require an external crystal or XO; instead, it uses its internal DSPLLs to clean and distribute timing signals from those references.
How many outputs does the SI5518E-B15664-GMR provide, and what formats are supported?
The SI5518E-B15664-GMR provides 18 configurable clock outputs supporting LVPECL, LVDS, HCSL, CML, and LVCMOS signaling formats. Each output has independent voltage, slew rate, and format control, enabling direct interface to diverse components such as FPGAs, RFICs, and SerDes PHYs without level-shifting components.
Is AccuTime™ software support included with the SI5518E-B15664-GMR?
Yes-AccuTime™ IEEE 1588 software is fully supported for the SI5518E-B15664-GMR. It enables full timing stack implementation (FTS, PTS, APTS) or partial integration (servo-only mode) with third-party PTP stacks, reducing firmware development time and improving time accuracy in synchronized networks.
What is the maximum output frequency capability of the SI5518E-B15664-GMR?
The SI5518E-B15664-GMR supports output frequencies up to 3.2 GHz. This enables direct clocking of 112G PAM4 SerDes, JESD204C converters, and mmWave RF synthesizers-making it suitable for advanced 5G O-RU and coherent optical module designs where high-frequency precision timing is critical.
SI5518E-B15664-GMR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- NetSync™
- Package/Case:
- 72-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- -
- Type:
- Clock Jitter Attenuator
- PLL:
- Yes
- Input:
- CMOS
- Output:
- CML, HCSL, LVCMOS, LVDS, LVPECL
- Number of Circuits:
- 1
- Ratio - Input:Output:
- 6:18
- Differential - Input:Output:
- Yes/Yes
- Frequency - Max:
- 650MHz, 3.2GHz
- Divider/Multiplier:
- Yes/No
- Voltage - Supply:
- 1.8V, 3.3V
- Operating Temperature:
- -40°C ~ 95°C (TA)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 72-QFN (10x10)
SI5518E-B15664-GMR FAQ
1.How can I place an order for SI5518E-B15664-GMR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI5518E-B15664-GMR 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 SI5518E-B15664-GMR reliable?
The price and inventory of SI5518E-B15664-GMR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI5518E-B15664-GMR is usually 5 days.
3.What payment methods are accepted for SI5518E-B15664-GMR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI5518E-B15664-GMR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI5518E-B15664-GMR?
SI5518E-B15664-GMR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI5518E-B15664-GMR 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 SI5518E-B15664-GMR?
For technical support, including SI5518E-B15664-GMR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI5518E-B15664-GMR requirements.
6.How does Aetrix verify that SI5518E-B15664-GMR is sourced from the original manufacturer or authorized distributors?
All SI5518E-B15664-GMR 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 SI5518E-B15664-GMR meets industry standards.
7.What is the process for return or replacement of SI5518E-B15664-GMR?
All SI5518E-B15664-GMR units undergo pre-shipment inspection (PSI). If there is an issue with SI5518E-B15664-GMR, 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 SI5518E-B15664-GMR part is unused and in its original packaging.
Return procedure for SI5518E-B15664-GMR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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