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Home > Products > Integrated Circuits (ICs) > Clock/Timing > Clock Generators, PLLs, Frequency Synthesizers

Skyworks Solutions Inc. SI5512D-B15675-GM

Name: SI5512D-B15675-GM
Brand: Skyworks Solutions Inc.
SKU: SI5512D-B15675-GM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI5512D-B15675-GM

Manufacturer:: Skyworks Solutions Inc.

Category:: Clock Generators, PLLs, Frequency Synthesizers

Package:: 72-VFQFN Exposed Pad

Datasheet:: SI5512D-B15675-GM.pdf

Description:: Linear IC's

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Product details

Overview

SI5512D-B15675-GM from Skyworks Solutions is a 12-output network synchronization clock IC supporting IEEE 1588v2, SyncE, and eCPRI for 5G wireless infrastructure. It integrates dual DSPLLs with 1 ppt DCO resolution, RFPLL for CPRI clocks, and supports JESD204B/C DCLK/SYSREF generation up to 1.2288 GHz integer and 650 MHz fractional outputs. Used in remote radio units and split-board massive MIMO systems.

For engineers reviewing the SI5512D-B15675-GM datasheet, SI5512D-B15675-GM pinout, SI5512D-B15675-GM application, or SI5512D-B15675-GM equivalent, key selection criteria include ITU-T G.8273.2/G.8273.4 compliance, ultra-low 47 fs RMS jitter, programmable loop bandwidth (1 mHz–4 kHz), and support for AccuTime™ IEEE 1588 software on host processor.

Technical Context

The SI5512D-B15675-GM implements three independent PLL domains: RFPLL for low-phase-noise CPRI clock synthesis, two fully featured DSPLLs for Ethernet fronthaul synchronization with adjustable DCO, and PPSPLL for instant lock to 1PPS/PP2S timing references. Each DSPLL supports automatic free-run, holdover, and locked modes with hitless input switching <150 ps phase transient.

It delivers synchronized JESD204B/C DCLK/SYSREF across multiple devices using MultiSynth™ fractional dividers and integer Q dividers, with per-output programmable delay (±10 ns), output-to-output skew <±50 ps, and support for LVDS, LVPECL, HCSL, CML, and SRL-LVCMOS signaling.

Key Specifications

Parameter	Value and Actual Design Meaning
Output count	12 configurable clock outputs for DCLK, SYSREF, or system clocks
RMS jitter (12 kHz–20 MHz)	47 fs typical at 491.52 MHz - meets stringent 5G RRH phase noise requirements
Phase noise floor	–164 dBc/Hz at 491.52 MHz - enables high-SNR RF signal chains
DCO resolution	1 ppt - provides sub-picosecond timing control for IEEE 1588 servo loops
Max integer frequency	1.2288 GHz - supports full JESD204C DCLK rates and CPRI Option 8
Max fractional frequency	650 MHz - enables flexible SYSREF and auxiliary clock synthesis
Input frequency range	Differential: 8 kHz–1 GHz; CMOS: 1PPS/PP2S, 8 kHz–250 MHz - accommodates diverse sync sources
Compliance standards	ITU-T G.8273.2 (T-TSC/T-BC), G.8273.4 (T-BC-P/A, T-TSC-P/A), G.8262.1 (eEEC) - certified for telecom boundary and slave clocks

Pinout & Package

SI5512D-B15675-GM is housed in a 72-lead QFN package (10 mm × 10 mm, 0.5 mm pitch) with exposed thermal pad. Pinout includes 6 clock inputs (differential and CMOS), 12 programmable clock outputs, I²C/SPI interface, power supplies (VDD = 3.3 V/1.8 V, VDDO = 3.3 V/2.5 V/1.8 V), status monitors (LOS, OOF, PHMON), and control pins for reset, mode selection, and interrupt.

Pin/Terminal	Circuit Role	Design Meaning
VDD, VDDO, VSS	Power supply rails	Separate core (3.3 V/1.8 V) and output driver (3.3 V/2.5 V/1.8 V) supplies enable mixed-signal noise isolation
CLKIN0–CLKIN5	Reference clock inputs	Supports differential (LVDS/LVPECL) and single-ended (CMOS) inputs including 1PPS/PP2S for precise time-of-day alignment
CLKOUT0–CLKOUT11	Programmable clock outputs	Configurable as DCLK/SYSREF with per-output delay, slew rate control, and multi-standard signaling (LVDS/HCSL/CML/LVCMOS)
SCL/SDA or SCLK/MOSI/MISO/CS	Serial configuration interface	I²C or 3-/4-wire SPI allows runtime reconfiguration of PLL parameters and output settings without reset
INT, RESET#, MODE0/1	Control and status signals	Interrupt flagging for LOS/OOF/PHMON events; hardware mode selection for boot configuration

Key Features

Feature	Design Value
Dual DSPLL architecture	Independent network synchronization PLLs with 1 mHz–4 kHz programmable loop bandwidth and automatic holdover/freerun mode transitions
JESD204B/C synchronization	Up to six DCLK/SYSREF output pairs with deterministic latency and inter-device skew compensation
Ultra-low jitter performance	47 fs RMS (12 kHz–20 MHz) enables >16-bit ADC/DAC timing integrity in fronthaul applications
AccuTime™ IEEE 1588 compatibility	Host-based servo algorithm and protocol stack integration eliminates need for external timing processor
O-RAN and eCPRI readiness	Fully compliant with O-RAN WG4 fronthaul timing specs and eCPRI Option 8 clocking requirements
Zero Delay Mode	All PLLs support zero-delay operation for transparent clock forwarding in cascaded timing architectures

Applications

5G Remote Radio Units (RRU)	IEEE 1588 Telecom Boundary Clock (T-BC)
Use Scenario: Digital baseband board in 5G macro cell site requiring precise phase-aligned clocks for FPGA processing and RFIC interfacing. IC Role / Device Role / Timing Role: Primary network synchronizer generating JESD204B/C DCLK/SYSREF and SyncE-compliant Ethernet clocks. Use Value: Enables deterministic fronthaul latency with <±50 ps output skew and 47 fs jitter-critical for massive MIMO beamforming coherence.	Use Scenario: Centralized timing node in mobile transport network aggregating PTP packets from multiple upstream grandmasters. IC Role / Device Role / Timing Role: ITU-T G.8273.2-compliant boundary clock with dual DSPLLs locking to primary and backup PTP streams. Use Value: Delivers sub-50 ns max time error (MTE) and <100 ns wander under G.8273.2 Class C requirements for metro aggregation.
eCPRI Fronthaul Timing	Partial Timing Support (T-BC-P)
Use Scenario: Distributed unit (DU) in open RAN architecture requiring low-jitter clocks for eCPRI Option 8 data interfaces. IC Role / Device Role / Timing Role: JESD204C-compatible clock generator with deterministic SYSREF alignment across multiple AFEs. Use Value: Supports 24.33024 Gbps eCPRI lanes with <1 ps cycle-to-cycle jitter-meeting O-RAN WG4 fronthaul spec.	Use Scenario: Small-cell base station operating in GPS-denied environments where GNSS holdover is unavailable. IC Role / Device Role / Timing Role: ITU-T G.8273.4-compliant partial timing support clock using internal DSPLL holdover with <100 ns/day aging drift. Use Value: Maintains <1.5 μs max time error over 24-hour holdover-enabling seamless failover without service interruption.

5G Remote Radio Units (RRU)

IEEE 1588 Telecom Boundary Clock (T-BC)

Use Scenario: Digital baseband board in 5G macro cell site requiring precise phase-aligned clocks for FPGA processing and RFIC interfacing.

IC Role / Device Role / Timing Role: Primary network synchronizer generating JESD204B/C DCLK/SYSREF and SyncE-compliant Ethernet clocks.

Use Value: Enables deterministic fronthaul latency with <±50 ps output skew and 47 fs jitter-critical for massive MIMO beamforming coherence.

Use Scenario: Centralized timing node in mobile transport network aggregating PTP packets from multiple upstream grandmasters.

IC Role / Device Role / Timing Role: ITU-T G.8273.2-compliant boundary clock with dual DSPLLs locking to primary and backup PTP streams.

Use Value: Delivers sub-50 ns max time error (MTE) and <100 ns wander under G.8273.2 Class C requirements for metro aggregation.

eCPRI Fronthaul Timing

Partial Timing Support (T-BC-P)

Use Scenario: Distributed unit (DU) in open RAN architecture requiring low-jitter clocks for eCPRI Option 8 data interfaces.

IC Role / Device Role / Timing Role: JESD204C-compatible clock generator with deterministic SYSREF alignment across multiple AFEs.

Use Value: Supports 24.33024 Gbps eCPRI lanes with <1 ps cycle-to-cycle jitter-meeting O-RAN WG4 fronthaul spec.

Use Scenario: Small-cell base station operating in GPS-denied environments where GNSS holdover is unavailable.

IC Role / Device Role / Timing Role: ITU-T G.8273.4-compliant partial timing support clock using internal DSPLL holdover with <100 ns/day aging drift.

Use Value: Maintains <1.5 μs max time error over 24-hour holdover-enabling seamless failover without service interruption.

Equivalent & Alternatives

The following parts are listed as comparable options for similar network synchronization clock applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Si5518D-B15675-GM	18-output variant with added RF functionality: VCXO reference input, OSYNC for JESD204B/C Subclass 2, and enhanced RFPLL phase noise performance	Required for integrated RF+digital board designs needing JESD204B/C Subclass 2 synchronization and tighter RF clock phase noise	Select Si5518D-B15675-GM only when OSYNC, VCXO reference, or Subclass 2 support is mandatory; otherwise SI5512D-B15675-GM reduces BOM cost and layout complexity
LMK5B33414RGZR	4-output clock generator with integrated JESD204B/C SYSREF generator; no DSPLL-based IEEE 1588 support; relies on external processor for PTP servo	Suitable for cost-sensitive small cells where full G.8273.2 compliance is not required and host processor handles PTP stack	Choose LMK5B33414RGZR for simpler timing needs without telecom-grade holdover or boundary clock certification; SI5512D-B15675-GM required for G.8273.2/G.8273.4 deployments

Compared with Si5518D-B15675-GM and LMK5B33414RGZR, SI5512D-B15675-GM uniquely balances 12-output flexibility, full ITU-T telecom compliance, and AccuTime™ software integration-making it optimal for split-board 5G RAN where RF and digital functions are separated and carrier-grade timing certification is mandatory.

Availability

SI5512D-B15675-GM is available at Aetrix Electronics and suitable for 5G remote radio units, IEEE 1588 boundary clock nodes, and eCPRI fronthaul systems requiring stable component supply, long-term lifecycle assurance, and full ITU-T compliance documentation.

Supply support for SI5512D-B15675-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 semiconductor company specializing in analog and mixed-signal connectivity solutions for wireless infrastructure, automotive, and IoT markets.

The Si5512 product line delivers fifth-generation DSPLL™-based network synchronizers designed specifically for 5G RAN, O-RAN, and telecom infrastructure requiring G.8273.2/G.8273.4-certified timing with ultra-low jitter and deterministic latency.

FAQ

What is the primary timing function of the SI5512D-B15675-GM in 5G infrastructure?

The SI5512D-B15675-GM serves as a dual-DSPLL network synchronizer for 5G remote radio units and distributed units, providing IEEE 1588v2-compliant boundary/slave clock functionality, SyncE-compliant Ethernet clocks, and JESD204B/C DCLK/SYSREF generation. Its 1 ppt DCO resolution and automatic holdover mode make SI5512D-B15675-GM essential for maintaining phase coherence across split-board massive MIMO systems.

Does the SI5512D-B15675-GM support JESD204C clocking requirements?

Yes, the SI5512D-B15675-GM supports JESD204C through its integer output capability up to 1.2288 GHz and deterministic SYSREF alignment across multiple outputs. While JESD204C compliance is enabled via configuration, SI5512D-B15675-GM's architecture-including MultiSynth™ fractional dividers and per-output programmable delay-meets JESD204C lane rate and latency requirements for 24.33024 Gbps eCPRI Option 8 interfaces.

How does the SI5512D-B15675-GM achieve ITU-T G.8273.2 compliance?

The SI5512D-B15675-GM achieves ITU-T G.8273.2 compliance through dual independent DSPLLs with programmable loop bandwidth (1 mHz–4 kHz), automatic free-run/holdover/locked state transitions, and sub-50 ns max time error under specified wander conditions. Its PPSPLL domain locks to 1PPS/PP2S with instant acquisition, and SI5512D-B15675-GM's integrated status monitoring ensures real-time validation of G.8273.2 Class C performance metrics.

Can the SI5512D-B15675-GM operate without external software like AccuTime™?

Yes, the SI5512D-B15675-GM operates as a standalone network synchronizer without AccuTime™ software, delivering full IEEE 1588v2 slave/boundary clock functionality via its on-chip DSPLLs and DCO. AccuTime™ is optional and runs on the host processor to enhance servo loop precision and protocol stack capabilities-but SI5512D-B15675-GM maintains full G.8273.2 compliance and timing integrity even without it.

What output signaling standards does the SI5512D-B15675-GM support?

The SI5512D-B15675-GM supports LVDS, S-LVDS, AC-coupled LVPECL, LVCMOS, slew-rate-limited (SRL) LVCMOS, HCSL, and CML signaling across its 12 outputs. Each output is independently configurable for voltage level, termination, and slew rate, enabling direct interface to FPGAs, ADCs/DACs, RFICs, and Ethernet PHYs without external level-shifting components-critical for SI5512D-B15675-GM deployment in space-constrained RAN boards.

SI5512D-B15675-GM Specifications

Product attributes: Attribute value

Manufacturer:: Skyworks Solutions Inc.

Series:: NetSync™

Package/Case:: 72-VFQFN Exposed Pad

Packaging:: Tray

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:: 6:12

Differential - Input:Output:: Yes/Yes

Frequency - Max:: 650MHz, 1.2288GHz

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)

SI5512D-B15675-GM FAQ

1.How can I place an order for SI5512D-B15675-GM through Aetrix?

Please submit a Request for Quotation (RFQ) for SI5512D-B15675-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 SI5512D-B15675-GM reliable?

The price and inventory of SI5512D-B15675-GM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI5512D-B15675-GM is usually 5 days.

3.What payment methods are accepted for SI5512D-B15675-GM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI5512D-B15675-GM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI5512D-B15675-GM?

SI5512D-B15675-GM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI5512D-B15675-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 SI5512D-B15675-GM?

For technical support, including SI5512D-B15675-GM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI5512D-B15675-GM requirements.

6.How does Aetrix verify that SI5512D-B15675-GM is sourced from the original manufacturer or authorized distributors?

All SI5512D-B15675-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 SI5512D-B15675-GM meets industry standards.

7.What is the process for return or replacement of SI5512D-B15675-GM?

All SI5512D-B15675-GM units undergo pre-shipment inspection (PSI). If there is an issue with SI5512D-B15675-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 SI5512D-B15675-GM part is unused and in its original packaging.

Return procedure for SI5512D-B15675-GM:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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