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Skyworks Solutions Inc. SI5518E-B15692-GMR
- Part No.:
- SI5518E-B15692-GMR
- Manufacturer:
- Skyworks Solutions Inc.
- Package:
- 72-VFQFN Exposed Pad
- Datasheet:
-
SI5518E-B15692-GMR.pdf
- Description:
- SI5518E-B15692-GMR
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SI5518E-B15692-GMR from Skyworks is a NetSync™ network synchronizer IC designed for IEEE 1588 Precision Time Protocol (PTP) applications in 5G radio units and O-RAN infrastructure. It features four DSPLLs, <55 fs RMS jitter, 1PPS input support, and programmable loop bandwidth down to 1 mHz. The device operates in synchronous, free-run, and holdover modes and supports ITU-T G.8273.2 (T-TSC, T-BC) and G.8273.4 compliance.
For engineers reviewing the SI5518E-B15692-GMR datasheet, SI5518E-B15692-GMR pinout, SI5518E-B15692-GMR application, or SI5518E-B15692-GMR equivalent, key selection criteria include 1PPS/PP2S timing interface capability, ultra-low jitter performance under SyncE/PTP synchronization, DSPLL count for multi-domain clock recovery, and AccuTime™ software integration readiness.
Technical Context
The SI5518E-B15692-GMR implements fifth-generation DSPLL architecture with up to four independent DSPLLs, enabling simultaneous tracking of multiple reference inputs including 1PPS and frequency-based clocks. Its MultiSynth-based output synthesis supports flexible format per output (LVPECL/LVDS/HCSL/CML/LVCMOS) and programmable phase/frequency adjustment for PTP servo control.
It delivers <55 fs RMS jitter at 122.88 MHz and supports automatic/manual hitless switching between references with phase transients as low as 30 ps. The device 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) standards, and integrates full AccuTime™ software support for FTS/PTS/APTS PTP operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Jitter (RMS) | <55 fs RMS - enables direct use without external jitter attenuator in 5G RU and O-RAN front-haul timing paths |
| DSPLL Count | 4 - supports concurrent synchronization to multiple references (e.g., 1PPS + SyncE + GNSS-derived clock) |
| Reference Inputs | 1PPS - provides precise phase alignment for IEEE 1588 boundary clock operation in telecom infrastructure |
| Output Frequency Max | 3.2 GHz - covers all CPRI/eCPRI, JESD204B/C, and high-speed SerDes clocking requirements |
| Loop Bandwidth Min | 1 mHz - allows ultra-slow servo response for long-term wander filtering in G.8273.2 T-TSC mode |
| Standards Compliance | ITU-T G.8273.2 (T-TSC, T-BC), G.8273.4 (T-BC-P/A, T-TSC-P/A), G.8262 (EEC Option 1/2), G.8262.1 (eEEC) - certifies suitability for telecom-grade timing equipment |
| AccuTime Support | Full - enables deployment of Skyworks' certified PTP stack for FTS, PTS, or APTS network timing architectures |
Pinout & Package
The SI5518E-B15692-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 for signal integrity, power sequencing, and thermal management in high-density RF and baseband boards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDIO_1–VDDIO_4 | IO Power Supply | Independent 1.8 V or 3.3 V supplies per output bank enable mixed-voltage clock distribution |
| CLKIN0–CLKIN5 | Reference Input | Supports differential (LVDS/LVPECL) or single-ended (LVCMOS) inputs; CLKIN0 dedicated to 1PPS |
| CLKOUT0–CLKOUT17 | Timing Output | 18 configurable outputs with per-pin format (LVPECL/LVDS/HCSL/CML/LVCMOS) and voltage selection |
| SDA/SCL | I²C Interface | Used for configuration, status monitoring, and real-time DCO tuning via AccuTime™ or host firmware |
| INTB | Interrupt Output | Open-drain alert for loss-of-lock, holdover entry, or reference switch events |
| RESETB | Hardware Reset | Active-low asynchronous reset that clears internal state and reinitializes PLLs and registers |
Key Features
| Feature | Design Value |
|---|---|
| Four independent DSPLLs | Enables simultaneous synchronization to diverse inputs (1PPS, SyncE, GNSS-derived clock) without external multiplexing |
| Programmable 1 mHz PLL bandwidth | Meets stringent ITU-T G.8273.2 wander filtering requirements for telecom boundary clocks |
| Hitless switching with ≤30 ps phase transient | Maintains deterministic timing during reference switchover-critical for CPRI/eCPRI and fronthaul SLA compliance |
| Integrated IEEE 1588 DCO (1 ppt/step) | Allows fine-grained frequency/phase correction directly in hardware, reducing PTP software latency and jitter |
| Full AccuTime™ software integration | Provides pre-validated, standards-compliant PTP stack for FTS/PTS/APTS deployment without custom development |
Applications
| 5G Radio Unit (O-RU) | O-RAN Front-Haul Gateway |
|---|---|
Use Scenario: Synchronizing distributed massive MIMO antenna elements in open RAN deployments using eCPRI over Ethernet. IC Role / Device Role / Timing Role: Boundary clock with dual-reference (1PPS + SyncE) tracking and sub-30 ps hitless switching for fronthaul timing continuity. Use Value: Eliminates need for discrete jitter attenuator and external PTP hardware accelerator while meeting O-RAN WG4 fronthaul timing specifications. | Use Scenario: Aggregating timing from multiple O-RUs and distributing synchronized clocks to centralized BBU/O-DU units. IC Role / Device Role / Timing Role: Telecom-grade boundary clock supporting G.8273.2 T-BC and G.8273.4 T-BC-P compliance with four DSPLLs for redundancy. Use Value: Enables single-chip timing consolidation across front-haul, mid-haul, and back-haul domains-reducing BOM count and board area by >40%. |
| Small Cell Base Station | Fixed Wireless Access (FWA) Unit |
Use Scenario: Providing precise time alignment for TDD-based LTE/NR small cells operating in unlicensed or shared spectrum. IC Role / Device Role / Timing Role: Slave clock with holdover capability and 1PPS discipline for GPS-denied indoor/outdoor deployments. Use Value: Delivers <100 ns time error over 24 hours in holdover-meeting 3GPP TS 38.104 timing stability requirements. | Use Scenario: Enabling synchronized beamforming and coordinated multipoint (CoMP) in fixed wireless CPE and base units. IC Role / Device Role / Timing Role: Grandmaster clock with 1PPS input and multiple LVDS/LVPECL outputs for RFIC and baseband SoC timing. Use Value: Supports sub-microsecond inter-device synchronization across multi-unit FWA deployments without external timing modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar network synchronizer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si5512E-B15691-GMR | 4 DSPLLs, 6 outputs, <55 fs RMS jitter, same 72-QFN package but lower output count and no PP2S support | Limited to simpler boundary clock roles without multi-output fronthaul distribution | Select when fewer clock outputs are required and cost optimization is prioritized over scalability |
| Si5401E-B15693-GMR | 3 DSPLLs, 10 outputs, <60 fs RMS jitter, supports 8 kHz minimum input frequency but lacks 1PPS-dedicated input path | Better suited for core/metro switches requiring SyncE wander filtering over 1PPS-based fronthaul | Choose for grandmaster or slave roles in packet-switched networks where 1PPS is not primary reference |
Compared with SI5518E-B15692-GMR, Si5512E-B15691-GMR offers identical DSPLL architecture and jitter performance but reduced output count for cost-sensitive O-RU designs, while Si5401E-B15693-GMR trades 1PPS specialization for broader frequency input flexibility and higher output count-making it more suitable for core network timing than fronthaul-critical deployments.
Availability
SI5518E-B15692-GMR is available at Aetrix Electronics and suitable for 5G radio unit design, O-RAN fronthaul gateway development, and fixed wireless access timing systems requiring stable component supply, traceable sourcing, and lifecycle continuity.
Supply support for SI5518E-B15692-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 semiconductor company specializing in analog and mixed-signal connectivity solutions for wireless, broadband, automotive, and industrial markets.
The SI5518E-B15692-GMR belongs to Skyworks' NetSync™ family of network synchronizers, engineered specifically for IEEE 1588 PTP and Synchronous Ethernet applications in 5G infrastructure, O-RAN, and telecom boundary clock systems.
FAQ
What is the primary timing function of the SI5518E-B15692-GMR in 5G O-RAN systems?
The SI5518E-B15692-GMR serves as a telecom-grade boundary clock in O-RAN radio units, providing IEEE 1588 PTP synchronization with four DSPLLs, <55 fs RMS jitter, and dedicated 1PPS input support. It enables precise fronthaul timing alignment for eCPRI interfaces while meeting ITU-T G.8273.2 T-TSC compliance-ensuring SI5518E-B15692-GMR meets strict phase and wander requirements across temperature and aging.
Does the SI5518E-B15692-GMR support both 1PPS and frequency-based reference inputs simultaneously?
Yes, the SI5518E-B15692-GMR supports concurrent use of 1PPS (on dedicated CLKIN0) and frequency-based references (e.g., SyncE on CLKIN1–CLKIN5). Its four DSPLLs allow independent locking to different inputs, enabling robust holdover and hitless switching-critical for SI5518E-B15692-GMR deployment in mission-critical 5G fronthaul where reference diversity improves system resilience.
What output formats and voltage levels does the SI5518E-B15692-GMR support?
The SI5518E-B15692-GMR supports LVPECL, LVDS, HCSL, CML, and LVCMOS output formats, with per-output VDDIO selection (1.8 V or 3.3 V). All 18 outputs are individually configurable-allowing SI5518E-B15692-GMR to drive heterogeneous timing loads such as FPGA transceivers, RFICs, and baseband processors on the same board without level-shifting components.
How does the SI5518E-B15692-GMR integrate with Skyworks' AccuTime™ software?
The SI5518E-B15692-GMR includes native register-level compatibility with Skyworks' AccuTime™ PTP software, supporting full FTS, PTS, and APTS timing architectures. AccuTime™ configures SI5518E-B15692-GMR's DCO, monitors lock status, and manages servo behavior-enabling SI5518E-B15692-GMR to deliver certified IEEE 1588 performance without custom firmware development.
Is the SI5518E-B15692-GMR qualified for extended temperature operation in outdoor 5G deployments?
The SI5518E-B15692-GMR is specified for –40°C to +85°C operation and meets industrial reliability standards, making it suitable for outdoor small cell and O-RU enclosures. While not AEC-Q100 automotive qualified, its thermal design and 72-QFN package with exposed pad ensure stable SI5518E-B15692-GMR performance under sustained ambient temperatures common in uncooled 5G infrastructure deployments.
SI5518E-B15692-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-B15692-GMR FAQ
1.How can I place an order for SI5518E-B15692-GMR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI5518E-B15692-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-B15692-GMR reliable?
The price and inventory of SI5518E-B15692-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-B15692-GMR is usually 5 days.
3.What payment methods are accepted for SI5518E-B15692-GMR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI5518E-B15692-GMR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI5518E-B15692-GMR?
SI5518E-B15692-GMR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI5518E-B15692-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-B15692-GMR?
For technical support, including SI5518E-B15692-GMR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI5518E-B15692-GMR requirements.
6.How does Aetrix verify that SI5518E-B15692-GMR is sourced from the original manufacturer or authorized distributors?
All SI5518E-B15692-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-B15692-GMR meets industry standards.
7.What is the process for return or replacement of SI5518E-B15692-GMR?
All SI5518E-B15692-GMR units undergo pre-shipment inspection (PSI). If there is an issue with SI5518E-B15692-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-B15692-GMR part is unused and in its original packaging.
Return procedure for SI5518E-B15692-GMR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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