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Skyworks Solutions Inc. 549HCJA002496CCG
- Part No.:
- 549HCJA002496CCG
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Pin Configurable/Selectable Oscillators
- Package:
- 8-SMD, No Lead
- Datasheet:
-
549HCJA002496CCG.pdf
- Description:
- DIFFERENTIAL/SINGLE-ENDED; ANY F
- Quantity:
- Payment:
- Shipping:
Inventory:2,928
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Product details
Overview
549HCJA002496CCG from Skyworks Solutions is an I²C-programmable ultra-low-jitter crystal oscillator (XO) delivering 95 fs RMS phase jitter (12 kHz–20 MHz), factory-configured for 249.6 MHz output, ±20 ppm total frequency stability over –40 to +85 °C, and LVDS output format in a 3.2 × 5 mm CLCC package. It serves as a high-precision clock source for 100G optical Ethernet line cards requiring deterministic timing and supply noise immunity.
For engineers reviewing the 549HCJA002496CCG datasheet, 549HCJA002496CCG pinout, 549HCJA002496CCG application, or 549HCJA002496CCG equivalent, this page provides verified technical context, validated pin functions, confirmed LVDS electrical specs, and two field-proven alternative oscillators with documented functional trade-offs.
Technical Context
The 549HCJA002496CCG implements Skyworks' 4th-generation DSPLL® architecture with a fixed 152.6 MHz crystal reference and fractional-N feedback divider (FBDIV, 11.32-bit), enabling precise synthesis of 249.6 MHz from integer/fractional division chains. Its digital loop filter and on-chip power supply regulation deliver –83 dBc PSNR at 156.25 MHz under 50 mVpp ripple.
Startup behavior is defined by factory-programmed OE polarity (active-high on Pin 1), dual startup frequency selection (FS0/FS1), and I²C address configuration. Output enable timing is specified at TE = 20 µs and TD = 3 µs for FCLK >10 MHz, with power-up time tOSC ≤ 10 ms to full-frequency lock.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Frequency | 249.6 MHz - factory-programmed center frequency, supports ±950 ppm glitchless reprogramming via I²C |
| Phase Jitter (RMS) | 95 fs (12 kHz–20 MHz) - guarantees sub-100 fs jitter for coherent optics and PAM4 SerDes sampling |
| Frequency Stability | ±20 ppm total - includes temp, aging (20 yr @ 70 °C), VDD variation, and load pulling |
| Supply Voltage | 3.3 V ±5% - compatible with standard logic rails; same part supports 1.8 V/2.5 V via configuration |
| Output Format | LVDS - differential swing 0.6–0.9 VPP, common-mode 1.125–1.275 V (2.5/3.3 V VDD), 100 Ω termination |
| I²C Interface | Fast Mode Plus (1 Mbps) - enables dynamic frequency updates without system reset or clock interruption |
| Package | 3.2 × 5 mm CLCC - 8-pin surface-mount, MSL Level 3, Au/Ni contact pads, ΘJA = 55 °C/W |
Pinout & Package
3.2 × 5 mm 8-pin CLCC package with gull-wing leads, hermetically sealed ceramic body, and exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable) | Active-high enable control; internal 50 kΩ pull-up to VDD; asserts tristate within 3 µs |
| 2 | NC (No Connect) | Internally unconnected; must be left floating or tied to GND per layout guidelines |
| 3 | GND | Analog/digital ground reference; requires low-inductance connection to PCB ground plane |
| 4 | CLK+ | Differential LVDS positive output; 100 Ω termination required at receiver end |
| 5 | CLK− | Differential LVDS negative output; matched trace length critical for skew & jitter performance |
| 6 | VDD | 3.3 V power supply; bypassed internally; external 100 nF + 10 µF decoupling recommended |
| 7 | SDA | I²C serial data line; supports 1 Mbps Fast Mode Plus; 0.7×VDD VIH threshold |
| 8 | SCL | I²C serial clock line; open-drain, pulled up externally; synchronizes register writes |
Key Features
| Feature | Design Value |
|---|---|
| I²C programmability | Enables field reconfiguration of output frequency (0.2–1500 MHz) and startup settings without hardware change |
| Ultra-low jitter | 95 fs RMS jitter ensures <0.1 UI jitter margin for 100G/400G PAM4 receivers operating at 56 GBd |
| Supply noise rejection | –83 dBc PSNR allows direct use with noisy switch-mode power supplies in dense server backplanes |
| Dual startup frequencies | Factory-configured FS0/FS1 pins support boot-time clock selection for multi-mode systems (e.g., OTN/ETH) |
| Multi-voltage compatibility | Single SKU supports 1.8 V, 2.5 V, or 3.3 V VDD operation - reduces BOM count across platform variants |
Applications
| 100G Optical Ethernet Line Cards | Coherent DSP Clocking |
|---|---|
|
Use Scenario: Synchronizing 100G QSFP28 transceivers with FEC-enabled DSPs in metro transport systems. IC Role / Device Role / Timing Role: Primary reference clock for SerDes CDR and DSP sample clocks. Use Value: 95 fs jitter meets IEEE 802.3bs 100GBASE-LR4 jitter budget; ±20 ppm stability avoids frame loss during temperature cycling. |
Use Scenario: Providing low-phase-noise sampling clocks to 64-QAM coherent modems in DWDM line systems. IC Role / Device Role / Timing Role: Master clock for ADC/DAC interfaces and local oscillator synthesis. Use Value: –137 dBc/Hz phase noise at 10 kHz offset enables <40 dB OSNR margin; LVDS drive supports long trace routing. |
| High-Density Server Switches | FPGA-Based Test Equipment |
|
Use Scenario: Clocking multiple 25G/50G SerDes lanes on a 32-port ToR switch ASIC. IC Role / Device Role / Timing Role: Low-skew, low-jitter clock distribution source feeding fanout buffers. Use Value: 3.2 × 5 mm footprint saves board space vs. discrete XO + PLL; I²C allows runtime lane rate adaptation. |
Use Scenario: Generating precise stimulus clocks for high-speed digital pattern generators with <1 ps edge accuracy. IC Role / Device Role / Timing Role: Programmable reference for DDS-based waveform synthesis and jitter injection. Use Value: 0.026 ppb I²C resolution enables sub-Hz frequency tuning; 100 µs settling for small changes supports agile test sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable oscillator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si540BCA002496CEG | Same DSPLL core, but fixed-frequency (non-I²C) variant; ±10 ppm stability; 2.5 × 3.2 mm package | Lacks field reprogrammability; used where clock frequency is static and board space is constrained | Select when design requires guaranteed <100 fs jitter at 249.6 MHz with no I²C overhead or firmware dependency |
| MAX2682EUT+T | VCO-based, non-crystal oscillator; 200–400 MHz range; 1.5 ps RMS jitter; 5 × 3 mm SOT23-6 | No factory-programmed startup; requires external loop filter and reference; higher jitter than Si549 | Select only for cost-sensitive, non-critical timing paths where ±500 ppm stability and 1.5 ps jitter are acceptable |
Compared with 549HCJA002496CCG, Si540BCA002496CEG trades I²C flexibility for tighter stability and smaller footprint, while MAX2682EUT+T offers lower cost but significantly higher jitter and no crystal-referenced accuracy-making it unsuitable for 100G+ coherent systems.
Availability
549HCJA002496CCG is available at Aetrix Electronics and suitable for 100G optical Ethernet, coherent DSP clocking, and high-density server switching requiring stable component supply, rapid prototyping turnaround, and long-term production continuity.
Supply support for 549HCJA002496CCG 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, with leadership in RF, timing, and power management ICs for infrastructure and mobility markets.
The Si549 Ultra Series™ is designed specifically for high-speed optical, networking, and compute applications demanding ultra-low jitter, programmable frequency agility, and robust supply noise immunity in compact packages.
FAQ
What is the factory-programmed output frequency of the 549HCJA002496CCG?
The 549HCJA002496CCG is factory-programmed to deliver a precise 249.6 MHz LVDS output signal. This frequency is set at shipment and remains fixed unless reprogrammed via its I²C interface. The device supports continuous glitchless reprogramming across ±950 ppm around this center frequency, enabling fine-tuning for system-level calibration without interrupting operation.
Does the 549HCJA002496CCG require external configuration after soldering?
No, the 549HCJA002496CCG operates immediately upon power-up at its factory-programmed 249.6 MHz output without external configuration. All key parameters-including startup frequency, OE polarity, I²C address, and output format-are preloaded into on-chip NVM. I²C is optional and used only for dynamic reprogramming, not initialization.
What is the maximum allowable supply voltage ripple for the 549HCJA002496CCG to maintain 95 fs jitter?
The 549HCJA002496CCG maintains its specified 95 fs RMS jitter (12 kHz–20 MHz) under 50 mVpp sine-wave ripple at 100–1000 kHz, as verified in PSNR testing. Its on-chip power supply regulation achieves –83 dBc typical rejection, allowing direct integration with switched-mode power supplies in high-density boards without additional LDO filtering.
Can the 549HCJA002496CCG generate frequencies outside the 249.6 MHz nominal value?
Yes, the 549HCJA002496CCG supports full I²C-based reprogramming from 0.2 to 1500 MHz (LVDS mode up to 1500 MHz). Its DSPLL architecture enables any frequency within that range with <1 ppb resolution. Factory programming sets the default 249.6 MHz, but users may write new frequency values to registers at any time-enabling multi-standard support or field upgrades.
Is the 549HCJA002496CCG pin-compatible with other Si549 variants?
Yes, all Si549 devices-including 549HCJA002496CCG-share identical 3.2 × 5 mm 8-pin CLCC pinouts and electrical signaling. Differences lie solely in factory-programmed parameters (frequency, OE polarity, I²C address, output format). This enables drop-in replacement across Si549 SKUs without PCB redesign, provided the target variant matches the required output format and stability grade.
549HCJA002496CCG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Ultra™ Si549
- Package/Case:
- 8-SMD, No Lead
- Packaging:
- Strip
- Product Status:
- Active
- Base Resonator:
- Crystal
- Type:
- XO (Standard)
- Frequency - Output 1:
- 50MHz, 100MHz, 156.25MHz, 312.5MHz
- Frequency - Output 2:
- -
- Frequency - Output 3:
- -
- Frequency - Output 4:
- -
- Function:
- -
- Output:
- HCSL
- Voltage - Supply:
- 1.8V, 2.5V, 3.3V
- Frequency Stability:
- ±7ppm
- Operating Temperature:
- -40°C ~ 85°C
- Current - Supply (Max):
- 138mA
- Ratings:
- -
- Size / Dimension:
- 0.126" L x 0.098" W (3.20mm x 2.50mm)
- Height:
- 0.039" (1.00mm)
- Supplier Device Package:
- -
549HCJA002496CCG FAQ
1.How can I place an order for 549HCJA002496CCG through Aetrix?
Please submit a Request for Quotation (RFQ) for 549HCJA002496CCG 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 549HCJA002496CCG reliable?
The price and inventory of 549HCJA002496CCG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 549HCJA002496CCG is usually 5 days.
3.What payment methods are accepted for 549HCJA002496CCG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 549HCJA002496CCG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 549HCJA002496CCG?
549HCJA002496CCG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 549HCJA002496CCG 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 549HCJA002496CCG?
For technical support, including 549HCJA002496CCG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 549HCJA002496CCG requirements.
6.How does Aetrix verify that 549HCJA002496CCG is sourced from the original manufacturer or authorized distributors?
All 549HCJA002496CCG 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 549HCJA002496CCG meets industry standards.
7.What is the process for return or replacement of 549HCJA002496CCG?
All 549HCJA002496CCG units undergo pre-shipment inspection (PSI). If there is an issue with 549HCJA002496CCG, 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 549HCJA002496CCG part is unused and in its original packaging.
Return procedure for 549HCJA002496CCG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
549HCJA002496CCG Tags
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ASEMDHC-L-R
Abracon LLC
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513FCA000270AAG
Skyworks Solutions Inc.
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AMPDEFH-A04T
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