Skyworks Solutions Inc. 549BCEC002180BCG

Overview

549BCEC002180BCG 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 156.25 MHz startup frequency, LVDS output format, ±20 ppm total stability over –40 to +85 °C, and 3.2×5 mm CLCC package. It serves as a high-precision clock source in 100G Ethernet switch PHYs requiring deterministic timing and supply noise immunity.

For engineers reviewing the 549BCEC002180BCG datasheet, 549BCEC002180BCG pinout, 549BCEC002180BCG application, or 549BCEC002180BCG equivalent, this page provides verified electrical specs, validated pin functions, confirmed startup configuration, real-world PSNR (–83 dBc), and two field-deployed alternative oscillators with documented functional trade-offs.

Technical Context

The 549BCEC002180BCG implements Skyworks' 4th-generation DSPLL® architecture with a fixed 152.6 MHz crystal reference, fractional feedback divider (FBDIV), and cascaded HSDIV/LSDIV integer dividers - enabling any frequency from 0.2 to 1500 MHz with <1 ppb resolution. Its digital loop filter and on-chip power supply regulation deliver –83 dBc PSNR at 156.25 MHz LVDS output under 50 mVpp 100 kHz supply ripple.

Startup behavior is determined by factory-programmed NVM: pin-selectable OE/FS logic (Pin 2 active-low), dual CMOS not enabled, and I²C address preloaded. The device supports 100 kbps/400 kbps/1 Mbps I²C modes and guarantees 10 ms power-up time to frequency lock with ±20 ppm accuracy.

Key Specifications

Pinout & Package

549BCEC002180BCG uses a 3.2×5 mm 8-pin CLCC package with gold-plated Ni underlayer contact pads (MIL-STD-883 qualified). Thermal resistance ΘJA = 55 °C/W (still air).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 549BCEC002180BCG, Si540BBA002180ACG removes I²C flexibility but reduces BOM count and eliminates bus contention risk, while MAX26901ATL+ trades programmability and voltage range for footprint reduction and marginally lower jitter - making each suitable only where their specific trade-offs align with system-level constraints.

Availability

549BCEC002180BCG is available at Aetrix Electronics and suitable for 100G Ethernet switch PHY clocking, coherent optical transport modules, and FPGA-based search acceleration requiring stable component supply, guaranteed aging performance, and rapid custom-frequency prototyping.

Supply support for 549BCEC002180BCG 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 high-performance systems.

The Si549 Ultra Series™ is designed for applications demanding ultra-low jitter, field-programmable frequency agility, and robust supply noise immunity - particularly in optical networking, high-speed SerDes, and test instrumentation where traditional XOs fall short.

FAQ

What is the factory-programmed startup frequency of the 549BCEC002180BCG?

The 549BCEC002180BCG is factory-configured for a 156.25 MHz startup frequency, which is applied immediately upon power-up before any I²C command is issued. This frequency is stored in non-volatile memory and remains active until overwritten via I²C register writes. The device retains this setting across power cycles unless explicitly reprogrammed.

Does the 549BCEC002180BCG support LVDS output at 156.25 MHz with guaranteed specifications?

Yes, the 549BCEC002180BCG delivers LVDS output at 156.25 MHz with fully guaranteed parameters: 115 fs RMS phase jitter (12 kHz–20 MHz), 0.7 V common-mode voltage, 0.7 VPP differential swing into 100 Ω, and 45–55% duty cycle. These values are characterized and specified in Table 2.1 and Table 2.3 of the official Si549 datasheet Rev. 206617A.

Can the 549BCEC002180BCG be reprogrammed in-system after soldering?

Yes, the 549BCEC002180BCG supports full in-system I²C reprogramming post-soldering. It accepts standard I²C commands at 100 kbps, 400 kbps, or 1 Mbps to change output frequency, update OE/FS polarity, or modify output format - all without requiring device reset or power cycle. Settling time is <100 μs for small frequency changes (<±950 ppm).

What is the power supply noise rejection (PSNR) performance of the 549BCEC002180BCG at 156.25 MHz?

The 549BCEC002180BCG achieves –83 dBc PSNR at 156.25 MHz LVDS output under 50 mVpp 100 kHz sine-wave supply ripple, as measured per Table 2.3 of the datasheet. This performance is enabled by integrated on-chip power supply regulation and applies directly to switched-mode power supply environments without external LDO filtering.

Is the 549BCEC002180BCG compatible with 1.8 V, 2.5 V, and 3.3 V supply rails simultaneously?

No - the 549BCEC002180BCG operates from a single VDD rail at either 1.8 V, 2.5 V, or 3.3 V (±5%), selected at factory configuration. While the same part number supports all three voltages, only one voltage is applied per unit. Output drive strength and common-mode levels auto-adapt to the chosen VDD, ensuring LVDS compliance across all supported rails.