onsemi MC100EP809FAG

MC100EP809FAG by onsemi Product Summary

The MC100EP809FAG from onsemi is a high-performance clock fanout buffer designed for critical timing applications in advanced electronic systems. Housed in a compact 32-LQFP package, it provides a 1:9 differential output configuration, enabling reliable clock distribution at frequencies up to 750 MHz. Its combination of low skew, flexible input selection, and robust output architecture makes it ideal for engineers seeking precise and scalable clock delivery across devices and backplanes.

Essential Attributes of the MC100EP809FAG Clock Fanout Buffer

Engineered for demanding environments, the MC100EP809FAG offers several attributes crucial for effective clock signal management:

Ultra-low device-to-device skew (100 ps typical) and minimal within-device skew (15 ps typical).

High-speed operation, supporting clock frequencies greater than 750 MHz.

Nine HSTL-compatible differential outputs with open emitter architecture, ensuring robust signal drive to 50 Ω termination.

Broad supply voltage compatibility: $V_{CCI}$ from 3.0 V to 3.6 V and $V_{CCO}$ from 1.6 V to 2.0 V.

Typical propagation delay of 850 ps, supporting tight timing budgets.

RoHS compliance and lead-free packaging for environmental responsibility.

Versatile Input Options and Multiplexing Features in MC100EP809FAG

At its core, the MC100EP809FAG integrates a 2:1 multiplexer, allowing selection between two distinct differential clock sources: HSTL and LVPECL. Both input pairs can accommodate LVDS levels, maximizing flexibility in clock sourcing. Clock selection is achieved via the LVTTL-compatible CLK_SEL pin, ensuring straightforward logic integration with system controllers. Importantly, the device offers synchronized output enable (OE), also LVTTL-compatible, designed to mitigate runt pulse generation by allowing enable/disable only when outputs are low. This synchronization is critical for maintaining signal integrity as clocks are switched or distributed.

Output Design and Signal Quality Factors of MC100EP809FAG

The MC100EP809FAG's output stage uses an open emitter architecture, optimized for direct 50 Ω termination to ground per output leg. Engineers should ensure both sides of every differential output are identically terminated to guarantee manufacturer-specified skew performance, even if only one side is utilized. Unused output pairs may remain unterminated without adverse effects on skew or device behavior. For some applications, single-ended driving is possible by properly biasing non-driven input pins, further expanding the device's integration flexibilities. These design choices, combined with the low output skew, facilitate high-fidelity distribution of clock signals across large systems or backplanes.

Electrical Specifications and AC Performance of MC100EP809FAG

The MC100EP809FAG is characterized under industry-standard environmental and operational conditions. Key detail highlights include:

LVPECL and HSTL input compatibility; both support 3.0 V to 3.6 V input supply and 1.6 V to 2.0 V output supply.

LVTTL and LVCMOS DC levels supported for control pins (e.g., CLK_SEL, OE).

All outputs tested with 50 Ω to ground for AC parameter validation.

Maintains performance and thermal equilibrium under specified airflow conditions (>500 lfpm).

AC performance metrics (skew, propagation delay, setup/hold times) measured with typical clock source swings and duty cycles.

These specifications should be validated in context with the system’s final clock source and termination selections to ensure optimal performance.

Mechanical Properties and Packaging Information for MC100EP809FAG

The MC100EP809FAG is delivered in a 32-lead QFN package (case 488AM, 5x5 mm footprint, 0.5 mm pitch), supporting dense PCB layout and efficient heat dissipation. The manufacturer’s soldering and mounting guides ensure robust integration, allowing engineers to meet reliability and coplanarity standards across both exposed pads and terminals. Marking diagrams are available via onsemi reference notes for traceability and production control. The package is fully compliant with lead-free and RoHS requirements, aligning with contemporary environmental standards.

Use Cases for MC100EP809FAG in Clock Distribution

Typical engineering deployments for the MC100EP809FAG include backplane clock distribution, high-speed communication system synchronization, and multi-device timing alignment in complex PCBs. Its low skew ensures that clock signals arrive near-simultaneously at all endpoints, a critical consideration for parallel data transfer, high-speed memory or FPGA interfacing, and synchronous control applications. Design resources such as the referenced application notes provide further guidance on clock distribution techniques, termination strategies, and interfacing with complementary signal families (PECL, ECL, LVDS, HSTL).

Alternative or Replacement Models Comparable to MC100EP809FAG

Engineers may consider several alternatives depending on system requirements:

Micrel SY89809L, which offers comparable multiplexed clock distribution capabilities and AC performance, is explicitly referenced as fully compatible.

Other ECLinPS devices in the onsemi portfolio may present similar pinouts and functional alignment, though skew, propagation delay, and packaging should be compared.

Assessment of alternative models should consider signal compatibility, voltage ranges, package options, and environmental compliance.

Conclusion

: Selecting and Deploying the MC100EP809FAG Clock Fanout Buffer

The MC100EP809FAG clock fanout buffer from onsemi provides a robust solution for precise, high-speed clock distribution in advanced electronic systems. Its multiplexer-based input selection, low output skew, and versatile signal compatibility make it an excellent choice for timing-critical designs in networking, communication, and control applications. By paying close attention to input/output termination, control logic integration, and package mounting, engineers and procurement professionals can ensure the MC100EP809FAG delivers optimal performance and reliability in their projects.