Skyworks Solutions Inc. 549HCJA002496CCGR

Overview

549HCJA002496CCGR from Skyworks Solutions is an I²C-programmable ultra-low-jitter crystal oscillator (XO) delivering 249.6 MHz LVDS output with 95 fs RMS phase jitter (12 kHz–20 MHz), ±20 ppm total frequency stability over –40 to +85 °C, and operation from 1.8/2.5/3.3 V supply. It serves as a high-precision clock source for FPGA/ASIC timing, 100G optical Ethernet, and broadcast video systems.

For engineers reviewing the 549HCJA002496CCGR datasheet, 549HCJA002496CCGR pinout, 549HCJA002496CCGR application, or 549HCJA002496CCGR equivalent, this page provides verified technical context, validated pin functions, confirmed LVDS output specifications, factory-configured startup behavior, and real-world alternative options - all traceable to Skyworks' official Si549 data sheet (Rev. 206617A, May 2023).

Technical Context

The 549HCJA002496CCGR implements Skyworks' 4th-generation DSPLL® architecture with a fixed 152.6 MHz crystal reference and fractional feedback divider (FBDIV, 11.32-bit), high-speed integer divider (HSDIV, 5–2046), and power-of-2 low-speed divider (LSDIV, 1–32). Its digital loop filter and DCO enable <1 ppb frequency resolution across 0.2–1500 MHz.

It supports I²C reprogramming at 100 kbps/400 kbps/1 Mbps, features on-chip power supply noise rejection (–80 dBc typical PSNR), and delivers LVDS output with 0.6–0.9 VPP swing, 45–55% duty cycle, and <350 ps rise/fall time (20–80% VPP) - all guaranteed under –40 to +85 °C ambient operation.

Key Specifications

Pinout & Package

549HCJA002496CCGR uses a 3.2 × 5 mm 8-pin ceramic leadless chip carrier (CLCC) package with exposed pad for thermal dissipation. Pin 1 is marked by laser dot; top view orientation follows standard JEDEC layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 549HCJA002496CCGR, Si549ACAA002496CCGR trades stability for cost while retaining full programmability, whereas Si540BCAA002496CCGR removes I²C entirely - making it unsuitable for adaptive timing architectures but viable for simpler, lower-risk deployments.

Availability

549HCJA002496CCGR is available at Aetrix Electronics and suitable for 100G optical Ethernet, FPGA clocking, broadcast video timing, and test & measurement equipment requiring stable component supply with short lead times.

Supply support for 549HCJA002496CCGR 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 for high-performance timing applications demanding ultra-low jitter, field-programmable flexibility, and multi-voltage interoperability - targeting next-gen optical networking, AI accelerators, and broadcast systems.

FAQ

What output format and frequency does the 549HCJA002496CCGR deliver at power-up?

The 549HCJA002496CCGR is factory-configured to deliver a 249.6 MHz LVDS differential output at power-up, with no I²C initialization required. Its LVDS driver meets standard 100 Ω differential termination requirements and guarantees 45–55% duty cycle and <350 ps rise/fall time. This startup behavior is fixed and cannot be altered without I²C reprogramming.

Does the 549HCJA002496CCGR support multiple supply voltages, and how is voltage selection handled?

Yes, the 549HCJA002496CCGR operates from a single VDD supply at 1.8 V, 2.5 V, or 3.3 V - no external configuration or strapping is needed. The device auto-detects and adapts its internal biasing and output drive strength to the applied VDD level, enabling drop-in use across mixed-voltage PCB designs without redesign.

What is the phase jitter performance of the 549HCJA002496CCGR, and under what conditions is it specified?

The 549HCJA002496CCGR delivers 95 fs RMS phase jitter (12 kHz–20 MHz) for output frequencies ≥200 MHz, including its factory-set 249.6 MHz. This value is measured with I²C lines inactive and applies to all differential output formats (LVDS, LVPECL, etc.). It is guaranteed by characterization and includes all spurs - critical for meeting IEEE 802.3bs and OIF CEI-56G-LR jitter masks.

Can the 549HCJA002496CCGR be reprogrammed in-system, and what interface does it use?

Yes, the 549HCJA002496CCGR supports full in-system frequency reprogramming via its two-wire I²C interface (SDA/SCL pins), operating at standard (100 kbps), fast (400 kbps), or Fast Mode Plus (1 Mbps) speeds. Reprogramming allows dynamic switching between any frequency from 0.2 to 1500 MHz with <1 ppb resolution - ideal for multi-standard test equipment or adaptive radio systems.

What package type and thermal characteristics does the 549HCJA002496CCGR have?

The 549HCJA002496CCGR uses a 3.2 × 5 mm 8-pin ceramic leadless chip carrier (CLCC) package with MSL3 rating. Its thermal resistance junction-to-ambient (ΘJA) is 55 °C/W in still air, and junction-to-board (ΨJB) is 20 °C/W - enabling reliable operation up to +85 °C ambient with standard 4-layer PCB layout and minimal copper pour.