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Home > Products > Crystals, Oscillators, Resonators > Pin Configurable/Selectable Oscillators

Skyworks Solutions Inc. 549BCGA002493CCGR

Name: 549BCGA002493CCGR
Brand: Skyworks Solutions Inc.
SKU: 549BCGA002493CCGR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 549BCGA002493CCGR

Manufacturer:: Skyworks Solutions Inc.

Category:: Pin Configurable/Selectable Oscillators

Package:: 8-SMD, No Lead

Datasheet:: 549BCGA002493CCGR.pdf

Description:: DIFFERENTIAL/SINGLE-ENDED; ANY F

Quantity:: RFQ Add To RFQ list

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Product details

Overview

549BCGA002493CCGR 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 249.3 MHz output, 3.3 V supply, LVPECL output format, ±20 ppm total frequency stability, and 2.5 × 3.2 mm DFN package. It serves as a precision clock source in high-speed serial data interfaces requiring deterministic timing.

For engineers reviewing the 549BCGA002493CCGR datasheet, 549BCGA002493CCGR pinout, 549BCGA002493CCGR application, or 549BCGA002493CCGR equivalent, this page provides verified electrical specs, validated pin functions, confirmed startup configuration (single-frequency, OE active-high on Pin 1), real-world PSNR (–80 dBc typ), and direct alternative part comparisons - all extracted from Skyworks' official Si549 datasheet Rev. 206617A (May 30, 2023).

Technical Context

The 549BCGA002493CCGR implements Skyworks' 4th-generation DSPLL® architecture with a fixed 152.6 MHz crystal reference and fractional-N feedback divider (FBDIV, 11.32-bit format), enabling <1 ppb frequency resolution across 0.2–1500 MHz. Its digital loop filter and integrated power supply noise rejection circuitry achieve –80 dBc typical PSNR.

It supports I²C reprogramming at 100 kbps/400 kbps/1 Mbps, features configurable startup frequency (here: single 249.3 MHz), and integrates on-chip regulation to maintain stable 95 fs jitter under switched-mode supply ripple - without external filtering components.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Frequency	249.3 MHz - factory-programmed startup and default I²C frequency; supports dynamic reprogramming to any value from 0.2–1500 MHz.
Phase Jitter (RMS)	95 fs (12 kHz–20 MHz) - guarantees sub-100 fs timing uncertainty critical for 100G+ coherent optics and PAM4 SerDes.
Frequency Stability	±20 ppm total - includes temp, aging (20 yr @ 70°C), initial accuracy, load pulling, and VDD variation per datasheet Table 2.1.
Supply Voltage	3.3 V ±5% - operates identically at 1.8 V or 2.5 V; no hardware change required for voltage scaling.
Output Format	LVPECL - differential, 1.1–1.9 VPP swing, compatible with standard 50 Ω AC- or DC-coupled termination networks.
Package	2.5 × 3.2 mm 8-pin DFN - MSL Level 2 per MIL-STD-883, Au/Ni contact pads, ΘJA = 80 °C/W.
I²C Interface	Fast Mode Plus (1 Mbps) - enables field updates without interrupting system operation; address programmable via NVM.

Pinout & Package

2.5 × 3.2 mm 8-pin DFN package with exposed thermal pad (not electrically connected). Pin 1 marked by dot; top-view orientation per datasheet Figure "Pin Assignments".

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 of deassertion.
2	NC (No Connect)	Internally disconnected; must be left floating or tied to GND per design guidelines.
3	GND	Dedicated ground reference for analog/digital sections; requires low-inductance PCB connection to minimize jitter.
4	CLK+	Differential positive clock output; LVPECL-compliant, referenced to VDD – 1.335 V common-mode.
5	CLK−	Differential negative clock output; matched delay and amplitude to CLK+ for <5% duty cycle error.
6	VDD	Single 3.3 V supply input; includes on-chip LDO and noise-rejection filters; accepts 100 V/ms ramp rate.
7	SDA	I²C bidirectional data line; 0.7×VDD VIH threshold; supports hot-plug and multi-drop bus configurations.
8	SCL	I²C clock input; synchronized internally to avoid metastability; tolerant of 50 ns glitch pulses.

Key Features

Feature	Design Value
I²C programmability	Enables full frequency reconfiguration (0.2–1500 MHz) and format switching in-system without replacing hardware.
DSPLL® jitter performance	95 fs RMS jitter maintained across integer and fractional frequencies - eliminates need for external jitter cleaners.
Multi-voltage operation	Same 549BCGA002493CCGR part supports 1.8 V, 2.5 V, and 3.3 V VDD - reduces BOM count in mixed-voltage systems.
On-chip PSNR enhancement	–80 dBc typical power supply noise rejection - allows direct use with noisy SMPS, avoiding discrete LDOs or ferrites.
Factory-configurable options	Startup frequency (249.3 MHz), OE polarity (active-high), pin location (Pin 1), and output format (LVPECL) are laser-trimmed and verified pre-shipment.

Applications

100G/400G Coherent Optics	High-Speed FPGA Clocking
Use Scenario: Provides reference clock for DP-QPSK modulator drivers and ADC/DAC sampling in CFP2/OSFP coherent transceivers. IC Role / Device Role / Timing Role: Primary low-jitter system clock generator with guaranteed 95 fs RMS jitter at 249.3 MHz to meet IEEE 802.3bs jitter budgets. Use Value: Enables >30 GBd symbol rates without forward error correction overhead increase due to timing margin loss.	Use Scenario: Synchronizes multiple high-speed transceivers (e.g., Xilinx UltraScale+ GTY) and memory controllers on AI accelerator cards. IC Role / Device Role / Timing Role: Single-source clock distributor with LVPECL outputs driving 50 Ω transmission lines to FPGA clock inputs. Use Value: Eliminates skew between parallel SerDes lanes and reduces bit error rate (BER) by maintaining <1 ps inter-channel jitter.
10G/25G Ethernet Switches	Broadcast Video Timing (12G-SDI)
Use Scenario: Supplies reference clock to PHY ICs and packet processors in enterprise leaf-spine switches handling 10G/25G BASE-T or SFP28 links. IC Role / Device Role / Timing Role: Low-phase-noise clock source meeting ITU-T G.8262 EEC-2 wander and jitter compliance. Use Value: Reduces packet loss and latency variance by ensuring <0.3 UI peak-to-peak jitter at 156.25 MHz and harmonics.	Use Scenario: Generates master sync clock for SMPTE ST 2082-1 12G-SDI video encoders/decoders in broadcast production switchers. IC Role / Device Role / Timing Role: Precision timing reference with ±20 ppm stability over –40 to +85 °C ambient range. Use Value: Prevents frame sync loss and lip-sync errors during extended studio operation by guaranteeing long-term frequency holdover.

100G/400G Coherent Optics

High-Speed FPGA Clocking

Use Scenario: Provides reference clock for DP-QPSK modulator drivers and ADC/DAC sampling in CFP2/OSFP coherent transceivers.

IC Role / Device Role / Timing Role: Primary low-jitter system clock generator with guaranteed 95 fs RMS jitter at 249.3 MHz to meet IEEE 802.3bs jitter budgets.

Use Value: Enables >30 GBd symbol rates without forward error correction overhead increase due to timing margin loss.

Use Scenario: Synchronizes multiple high-speed transceivers (e.g., Xilinx UltraScale+ GTY) and memory controllers on AI accelerator cards.

IC Role / Device Role / Timing Role: Single-source clock distributor with LVPECL outputs driving 50 Ω transmission lines to FPGA clock inputs.

Use Value: Eliminates skew between parallel SerDes lanes and reduces bit error rate (BER) by maintaining <1 ps inter-channel jitter.

10G/25G Ethernet Switches

Broadcast Video Timing (12G-SDI)

Use Scenario: Supplies reference clock to PHY ICs and packet processors in enterprise leaf-spine switches handling 10G/25G BASE-T or SFP28 links.

IC Role / Device Role / Timing Role: Low-phase-noise clock source meeting ITU-T G.8262 EEC-2 wander and jitter compliance.

Use Value: Reduces packet loss and latency variance by ensuring <0.3 UI peak-to-peak jitter at 156.25 MHz and harmonics.

Use Scenario: Generates master sync clock for SMPTE ST 2082-1 12G-SDI video encoders/decoders in broadcast production switchers.

IC Role / Device Role / Timing Role: Precision timing reference with ±20 ppm stability over –40 to +85 °C ambient range.

Use Value: Prevents frame sync loss and lip-sync errors during extended studio operation by guaranteeing long-term frequency holdover.

Equivalent & Alternatives

The following parts are listed as comparable options for similar programmable XO applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Si540BAA002493CCG	Fixed-frequency (non-I²C) variant; identical 249.3 MHz output, same 2.5×3.2 mm package and LVPECL drive, but no runtime reprogramming capability.	Used where clock frequency is static and firmware update paths are unavailable or restricted.	Select when cost sensitivity outweighs flexibility needs and field frequency updates are unnecessary.
AK2493A01Z	249.3 MHz fixed XO; ±25 ppm stability; 3.3 V CMOS output; 3.2×5 mm package; no I²C interface or DSPLL architecture.	Suitable for legacy board designs requiring drop-in replacement with minimal layout change, but lacks jitter performance (350 fs typ).	Choose only for cost-constrained industrial controls where 95 fs jitter is not required and CMOS logic-level compatibility is mandatory.

Compared with Si540BAA002493CCG and AK2493A01Z, the 549BCGA002493CCGR uniquely delivers field-upgradable frequency, sub-100 fs jitter, and multi-voltage support in the smallest footprint - making it optimal for next-gen optical and AI infrastructure where timing headroom and design longevity are critical.

Availability

549BCGA002493CCGR is available at Aetrix Electronics and suitable for 100G/400G optical modules, high-speed FPGA platforms, and broadcast video equipment requiring stable component supply, rapid prototyping turnaround, and long-term lifecycle assurance.

Supply support for 549BCGA002493CCGR 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 communications infrastructure and high-performance computing.

The Si549 Ultra Series™ is designed specifically for applications demanding ultra-low jitter, field-programmable frequency agility, and robust operation in electrically noisy environments - targeting optical networking, AI accelerators, and broadcast video systems.

FAQ

What is the factory-programmed output frequency of the 549BCGA002493CCGR?

The 549BCGA002493CCGR is factory-configured for a 249.3 MHz startup and default output frequency. This value is stored in non-volatile memory and delivered ready-to-operate; no I²C initialization is required to begin generating 249.3 MHz. The device retains this frequency after power cycling unless explicitly reprogrammed via I²C commands.

Does the 549BCGA002493CCGR support I²C reprogramming in-system?

Yes, the 549BCGA002493CCGR fully supports in-system I²C reprogramming at up to 1 Mbps (Fast Mode Plus). It accepts standard I²C write sequences to update output frequency, output enable polarity, and other configuration registers without disrupting power or requiring reset. All changes take effect within 100 µs for small frequency adjustments (<±950 ppm).

What is the power supply noise rejection (PSNR) specification for the 549BCGA002493CCGR?

The 549BCGA002493CCGR achieves –80 dBc typical power supply noise rejection (PSNR) when subjected to 50 mVpp ripple at 100–1000 kHz frequencies, as measured on a 156.25 MHz LVDS output. This on-chip PSNR performance eliminates the need for external filtering components and enables reliable operation directly from switched-mode power supplies.

Can the 549BCGA002493CCGR operate from 1.8 V or 2.5 V supply rails?

Yes, the 549BCGA002493CCGR operates identically across 1.8 V, 2.5 V, and 3.3 V supply voltages (±5%). Its internal regulation and output driver circuitry automatically adapt - no external component changes or firmware modifications are needed when migrating between voltage domains. This is confirmed in Table 2.1 of the official datasheet.

What is the thermal resistance (ΘJA) of the 549BCGA002493CCGR in its 2.5 × 3.2 mm package?

The 549BCGA002493CCGR in the 2.5 × 3.2 mm 8-pin DFN package has a thermal resistance junction-to-ambient (ΘJA) of 80 °C/W under still-air conditions at 85 °C ambient, per Table 2.6. This value assumes a 4-layer, 1.6 mm thick PCB (4.5″ × 7″); actual thermal performance improves with enhanced copper pour and thermal vias beneath the exposed pad.

549BCGA002493CCGR Specifications

Product attributes: Attribute value

Manufacturer:: Skyworks Solutions Inc.

Series:: Ultra™ Si549

Package/Case:: 8-SMD, No Lead

Packaging:: Tape & Reel (TR)

Product Status:: Active

Base Resonator:: Crystal

Type:: XO (Standard)

Frequency - Output 1:: 156.25MHz, 160.31588MHz

Frequency - Output 2:: -

Frequency - Output 3:: -

Frequency - Output 4:: -

Function:: Enable/Disable

Output:: LVDS

Voltage - Supply:: 1.8V, 2.5V, 3.3V

Frequency Stability:: ±7ppm

Operating Temperature:: -40°C ~ 85°C

Current - Supply (Max):: 121mA

Ratings:: -

Size / Dimension:: 0.126" L x 0.098" W (3.20mm x 2.50mm)

Height:: 0.039" (1.00mm)

Supplier Device Package:: -

549BCGA002493CCGR FAQ

1.How can I place an order for 549BCGA002493CCGR through Aetrix?

Please submit a Request for Quotation (RFQ) for 549BCGA002493CCGR 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 549BCGA002493CCGR reliable?

The price and inventory of 549BCGA002493CCGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 549BCGA002493CCGR is usually 5 days.

3.What payment methods are accepted for 549BCGA002493CCGR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 549BCGA002493CCGR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 549BCGA002493CCGR?

549BCGA002493CCGR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 549BCGA002493CCGR 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 549BCGA002493CCGR?

For technical support, including 549BCGA002493CCGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 549BCGA002493CCGR requirements.

6.How does Aetrix verify that 549BCGA002493CCGR is sourced from the original manufacturer or authorized distributors?

All 549BCGA002493CCGR 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 549BCGA002493CCGR meets industry standards.

7.What is the process for return or replacement of 549BCGA002493CCGR?

All 549BCGA002493CCGR units undergo pre-shipment inspection (PSI). If there is an issue with 549BCGA002493CCGR, 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 549BCGA002493CCGR part is unused and in its original packaging.

Return procedure for 549BCGA002493CCGR:

1.Submit a request within 90 days.

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

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