**AD8561AR-REEL7: A Comprehensive Guide to the 7ns Single-Supply Comparator**

In the realm of high-speed signal processing and precision voltage level detection, the **AD8561AR-REEL7** stands out as a remarkably efficient and robust component. This device is a **single-supply comparator** from Analog Devices, engineered to deliver exceptional performance with a **propagation delay of just 7 nanoseconds**. This combination of speed and single-supply operation makes it an indispensable tool for a wide array of applications, from communication systems to industrial control units.

The core of the AD8561's appeal lies in its blazing-fast response time. The **ultra-low 7ns propagation delay** ensures that the device can react to input signal changes almost instantaneously. This is critical in time-sensitive circuits such as **peak detectors, threshold discriminators, and clock recovery circuits**, where any delay can lead to data errors or system inefficiencies. Furthermore, this speed is maintained while operating from a **single supply voltage ranging from +2.7V to +5.5V**, making it perfectly suited for modern, low-voltage, battery-powered portable equipment and 3.3V or 5V digital systems.

Despite its high speed, the AD8561 does not compromise on versatility or ease of use. It features **rail-to-rail input and output stages**, allowing the input signals to swing close to the supply rails and enabling the output to drive logic gates directly. This simplifies interface with both analog sensors and downstream digital logic (like CMOS, TTL, or µP inputs) without requiring additional level-shifting components. The internal design also incorporates **latch-free operation**, which is vital for preventing erroneous output oscillations in noisy environments.

The device is offered in the **REEL7 packaging**, which denotes a 7-inch reel containing 1,000 units, optimized for high-volume automated manufacturing. The **AD8561AR** specific variant comes in an 8-pin SOIC package, providing a compact footprint for space-constrained PCB designs. Designers must pay attention to proper decoupling and layout techniques to harness its full potential; a **0.1µF decoupling capacitor close to the supply pins** is highly recommended to minimize noise and ensure stable operation.

**ICGOO**

**DFIND Summary**: The AD8561AR-REEL7 is a high-performance, single-supply comparator that masterfully balances **ultra-high speed (7ns propagation delay)** with the practicality of **low-voltage operation**. Its rail-to-rail capability and robust design make it a superior choice for fast switching applications in modern electronic systems.

**Keywords**: Single-Supply Comparator, 7ns Propagation Delay, Rail-to-Rail Output, High-Speed Signal Processing, Low-Voltage Operation.