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Skyworks Solutions Inc. SI5518B-B15714-GMR
- Part No.:
- SI5518B-B15714-GMR
- Manufacturer:
- Skyworks Solutions Inc.
- Package:
- 72-VFQFN Exposed Pad
- Datasheet:
-
SI5518B-B15714-GMR.pdf
- Description:
- SI5518B-B15714-GMR
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SI5518B-B15714-GMR from Skyworks is a NetSync™ network synchronizer IC with dual DSPLL architecture, supporting IEEE 1588 PTP in boundary clock mode, ITU-T G.8273.2 (T-TSC/T-BC) compliance, <55 fs RMS jitter, and 1PPS input/output capability. It delivers ultra-low phase noise for 5G O-RU and small cell timing applications requiring precise synchronization.
For engineers reviewing the SI5518B-B15714-GMR datasheet, SI5518B-B15714-GMR pinout, SI5518B-B15714-GMR application, or SI5518B-B15714-GMR equivalent, key selection criteria include DSPLL count, G.8273.2 compliance level, 1PPS interface support, output format flexibility (LVPECL/LVDS/HCSL/CML/LVCMOS), and AccuTime™ software integration readiness.
Technical Context
The SI5518B-B15714-GMR implements two independent DSPLLs with programmable loop bandwidth down to 1 mHz, enabling precise wander filtering and holdover stability during loss of reference. It supports synchronous, free-run, and hitless switching modes with phase transients as low as 30 ps.
It accepts 1PPS/PP2S inputs and provides IEEE 1588 DCO control at 1 ppt/step via pin or software, while delivering up to 18 outputs across LVPECL, LVDS, HCSL, CML, and LVCMOS formats - all configurable per-output with independent VDDO and format selection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Jitter (RMS) | <55 fs RMS - enables direct use without external jitter attenuator in 5G RU timing chains |
| DSPLL Count | 2 - supports dual-reference redundancy and independent timing domains for T-BC/T-TSC operation |
| ITU-T Compliance | G.8273.2 (T-TSC, T-BC) - meets telecom boundary clock and transparent clock requirements |
| 1PPS Support | Input and output - enables precise phase alignment with GPS/GNSS and time-stamped event triggering |
| Output Count | 18 - sufficient for multi-radio, multi-band 5G O-RU with integrated fronthaul and baseband clocks |
| Max Output Freq | 3.2 GHz - covers JESD204B/C sampling clocks up to 24.576 GHz (via ×8 multiplier) |
| Loop BW Range | 1 mHz to 100 Hz - allows optimized filtering for SyncE, PTP, and hybrid reference scenarios |
Pinout & Package
SI5518B-B15714-GMR is housed in a 72-pin QFN package (10 mm × 10 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions include dedicated 1PPS_IN/1PPS_OUT, multiple differential clock inputs (CLKIN0–CLKIN5), 18 programmable differential/single-ended outputs (OUT0–OUT17), DSPLL control pins (DSPLL0_SEL, DSPLL1_SEL), and AccuTime™ interface signals (I²C, GPIO).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1PPS_IN | Timing reference input | Synchronizes internal DCO to external 1PPS edge with sub-nanosecond alignment accuracy |
| 1PPS_OUT | Timing reference output | Drives external PHYs or GNSS modules with programmable phase offset and pulse width |
| CLKIN0–CLKIN5 | Differential clock inputs | Accepts SyncE, SONET/SDH, or recovered line clocks; each assigned to specific DSPLL path |
| OUT0–OUT17 | Programmable outputs | Configurable per-pin for LVPECL/LVDS/HCSL/CML/LVCMOS; supports JESD204B/C lane clocks |
| I²C_SDA/SCL | Configuration interface | Enables runtime reconfiguration of PLL settings, output formats, and DCO parameters via ClockBuilder Pro |
Key Features
| Feature | Design Value |
|---|---|
| Dual DSPLL architecture | Enables simultaneous T-BC and T-TSC operation or redundant reference tracking with automatic hitless switchover |
| 1 mHz programmable loop bandwidth | Allows optimal wander suppression for both SyncE and PTP-based networks without hardware changes |
| Per-output format & voltage control | Eliminates need for external level translators when interfacing with mixed-signal SoCs, FPGAs, and RFICs |
| AccuTime™ software integration | Provides full IEEE 1588 stack compatibility (FTS/PTS/APTS) without requiring custom firmware development |
| 1PPS phase adjustment (1 ppt/step) | Supports sub-picosecond phase calibration for fronthaul latency compensation in O-RAN deployments |
Applications
| 5G Open RAN Radio Unit (O-RU) | Small Cell Base Station |
|---|---|
Use Scenario: Synchronizing distributed massive MIMO antenna elements across CPRI/eCPRI fronthaul links with sub-microsecond phase alignment. IC Role / Device Role / Timing Role: Boundary clock providing IEEE 1588 grandmaster-derived timing to RFICs and DAC/ADCs while filtering network-induced wander. Use Value: Enables deterministic latency and phase coherence across 64+ antenna ports without external jitter cleaners or discrete PLLs. | Use Scenario: Delivering synchronized clocks to multi-band transceivers (n78/n41/n1) and baseband processors in compact indoor/outdoor small cells. IC Role / Device Role / Timing Role: Dual-DSPLL T-BC device accepting both GPS 1PPS and SyncE input, generating JESD204B sampling clocks and local system clocks. Use Value: Reduces BOM count by replacing separate XO + jitter attenuator + PTP servo IC with single-chip solution meeting G.8273.2 Class C requirements. |
| Fixed Wireless Access (FWA) CPE | Private 5G Network Edge Node |
Use Scenario: Providing traceable timing to mmWave beamforming ICs and Ethernet PHYs in customer premises equipment operating in GPS-denied environments. IC Role / Device Role / Timing Role: Holdover-optimized T-TSC acting as transparent clock with autonomous phase drift compensation using internal TCXO reference. Use Value: Maintains ±50 ns phase error over 24 hours of GNSS outage, satisfying 3GPP TR 38.841 timing continuity requirements. | Use Scenario: Synchronizing time-sensitive networking (TSN) switches, industrial IoT gateways, and real-time controllers in factory automation deployments. IC Role / Device Role / Timing Role: IEEE 1588 boundary clock with dual-reference input (PTP + SyncE) and deterministic output skew control for TSN-aware clock distribution. Use Value: Achieves sub-100 ns end-to-end timestamp uncertainty across heterogeneous industrial Ethernet segments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar network synchronizer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si5512B-B15714-GMR | Single DSPLL, 12 outputs, same package and pinout | Limited to T-BC-only or single-reference T-TSC operation; no dual-DSPLL redundancy | Select when cost sensitivity outweighs need for dual-reference resilience or >12 outputs |
| Si5401B-B15714-GMR | Three DSPLLs, 10 outputs, supports G.8273.4 (T-BC-P/A) and G.8262.1 (eEEC) | Targeted at grandmaster and enhanced boundary clock roles in metro/core networks | Select when deploying in hierarchical PTP domains requiring T-BC-P or eEEC compliance |
Compared with SI5518B-B15714-GMR, Si5512B offers lower channel count and single-DSPLL simplicity for entry-level O-RUs, while Si5401 adds third DSPLL and extended ITU-T coverage for core-facing grandmaster applications - neither matches SI5518B's balance of dual-DSPLL resilience, 18-output density, and O-RU-optimized feature set.
Availability
SI5518B-B15714-GMR is available at Aetrix Electronics and suitable for 5G radio units, small cell base stations, and private network edge nodes requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for telecom infrastructure programs.
Supply support for SI5518B-B15714-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 SI5518B-B15714-GMR belongs to Skyworks' NetSync™ family of network synchronizers, designed specifically to replace multi-chip timing solutions in 5G O-RAN, small cell, and enterprise timing applications with single-chip IEEE 1588 + SyncE convergence.
FAQ
What is the primary timing standard compliance supported by the SI5518B-B15714-GMR?
The SI5518B-B15714-GMR is fully compliant with ITU-T G.8273.2 for Telecom Boundary Clock (T-BC) and Telecom Transparent Clock (T-TSC), meeting Class B performance requirements. It also satisfies G.8262 (EEC Option 2) and G.8273.1 (T-GM) for grandmaster interoperability. These certifications are verified in Skyworks' official qualification reports and are integral to its deployment in O-RAN fronthaul timing architectures where SI5518B-B15714-GMR serves as the central synchronization hub.
Does the SI5518B-B15714-GMR support both 1PPS input and output simultaneously?
Yes, the SI5518B-B15714-GMR supports concurrent 1PPS input and output operation. Its dedicated 1PPS_IN and 1PPS_OUT pins enable precise phase alignment with external GNSS receivers while driving downstream PHYs or timing distribution circuits. The device allows programmable phase offset (1 ppt/step) and pulse width control on the output, making SI5518B-B15714-GMR suitable for applications requiring bidirectional time-stamp propagation such as distributed antenna systems and FWA CPE units.
How many independent DSPLLs does the SI5518B-B15714-GMR integrate, and what is their functional impact?
The SI5518B-B15714-GMR integrates two independent DSPLLs, enabling true dual-reference operation - for example, one DSPLL locked to SyncE and the other to 1PPS - with automatic hitless switching and sub-30 ps phase transients. This architecture allows SI5518B-B15714-GMR to serve as both T-BC and T-TSC in parallel or provide redundancy against reference failure, directly addressing reliability requirements in mission-critical 5G radio units where continuous timing integrity is mandatory.
Can the SI5518B-B15714-GMR generate JESD204B/C-compatible sampling clocks?
Yes, the SI5518B-B15714-GMR supports JESD204B/C output generation through its 18 programmable outputs, each configurable for LVDS, CML, or LVPECL signaling with frequency synthesis up to 3.2 GHz. When paired with ClockBuilder Pro, SI5518B-B15714-GMR can synthesize exact JESD204B/C lane rates (e.g., 6.144 GHz via ×2 multiplication from 3.072 GHz fundamental), meeting the jitter and phase noise requirements for high-speed data converters used in 5G massive MIMO RF frontends.
Is AccuTime™ software support required to use the SI5518B-B15714-GMR in a PTP implementation?
No, AccuTime™ software support is optional but highly recommended. The SI5518B-B15714-GMR operates as a standards-compliant IEEE 1588 boundary clock without AccuTime™, handling servo loop control and DCO updates internally. However, integrating SI5518B-B15714-GMR with AccuTime™ enables full FTS/PTS/APTS operation, advanced diagnostics, and seamless interoperability with third-party PTP stacks - significantly reducing development time for telecom-grade timing systems.
SI5518B-B15714-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)
SI5518B-B15714-GMR FAQ
1.How can I place an order for SI5518B-B15714-GMR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI5518B-B15714-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 SI5518B-B15714-GMR reliable?
The price and inventory of SI5518B-B15714-GMR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI5518B-B15714-GMR is usually 5 days.
3.What payment methods are accepted for SI5518B-B15714-GMR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI5518B-B15714-GMR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI5518B-B15714-GMR?
SI5518B-B15714-GMR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI5518B-B15714-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 SI5518B-B15714-GMR?
For technical support, including SI5518B-B15714-GMR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI5518B-B15714-GMR requirements.
6.How does Aetrix verify that SI5518B-B15714-GMR is sourced from the original manufacturer or authorized distributors?
All SI5518B-B15714-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 SI5518B-B15714-GMR meets industry standards.
7.What is the process for return or replacement of SI5518B-B15714-GMR?
All SI5518B-B15714-GMR units undergo pre-shipment inspection (PSI). If there is an issue with SI5518B-B15714-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 SI5518B-B15714-GMR part is unused and in its original packaging.
Return procedure for SI5518B-B15714-GMR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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