**HMC7447: A High-Performance 4:1 Mux and 1:4 Fanout with Integrated Input Terminations**

In the realm of high-speed digital systems, signal integrity and clock distribution are paramount. The **HMC7447** stands out as a critical integrated circuit (IC) designed to address these challenges by combining a **4:1 multiplexer (MUX)** and a **1:4 fanout buffer** in a single, compact package. A key differentiator of this device is its **integrated 50Ω input terminations**, which significantly enhance signal fidelity and simplify board-level design by eliminating the need for external termination resistors.

The multiplexer section allows one of four differential inputs to be selected and routed to a single output, operating at data rates up to **28 Gbps**. This makes it ideal for applications such as high-speed data acquisition systems, where selecting between multiple data sources is required. The selected signal then passes through the on-chip fanout buffer, which distributes the input to four identical, low-skew output copies. This fanout capability is crucial for synchronizing multiple components, such as Analog-to-Digital Converters (ADICs) or FPGAs, from a single clock or data source.

The integration of on-chip input terminations is a major advantage. It not only saves valuable PCB real estate but also ensures a clean, reflection-free interface by providing a proper impedance match directly at the input pins. This feature is vital for maintaining signal integrity at multi-gigabit data rates. Fabricated on a **high-performance InP (Indium Phosphide) process**, the HMC7447 delivers exceptional performance with low additive jitter and high bandwidth, making it suitable for the most demanding wired and wireless infrastructure, as well as test and measurement equipment.

**ICGOODFIND:** The HMC7447 is a superior integration solution that merges a high-speed 4:1 MUX and a 1:4 fanout with built-in terminations. Its value lies in its ability to **simplify system design, reduce component count, and uphold exceptional signal integrity** in next-generation high-frequency applications.

**Keywords:** High-Speed Multiplexer, Fanout Buffer, Signal Integrity, Integrated Termination, InP Technology.