ON Semiconductor MC74AC161N: 4-Bit Binary Counter

The MC74AC161N is a high-speed 4-bit binary counter chip designed and manufactured by ON Semiconductor, a reputable leader in the semiconductor industry. This integrated circuit (IC) is part of the AC series, which is well-known for its advanced high-speed CMOS technology.

The MC74AC161N is a synchronous counter that features a fully synchronous counting and programming operation through its four-bit binary design. The synchronous design allows for higher-speed operation than typical ripple-carry type counters. The device has an on-chip carry lookahead for easy cascading of multiple counters, which is a critical feature for designers looking to build complex counting systems.

This binary counter includes an asynchronous master reset (CLR) input that overrides all other inputs and forces the outputs to a low state. Additionally, the counter has two count enable inputs (nCEP and nCET), a clock input (CLK), and a ripple carry output (RCO) for cascades. The nCEP input is for counting while the nCET input controls the internal state of the counter, ensuring precise control over the counting process.

The MC74AC161N operates over a wide voltage range of 2V to 6V and provides typical count frequencies of up to 125 MHz, making it suitable for high-speed applications. Its outputs can drive up to 10 LSTTL loads, which means it can directly interface with most TTL families, thus providing great versatility in mixed-technology environments.

Encased in a plastic DIP (Dual In-line Package), the MC74AC161N is designed for through-hole mounting, which makes it easy to install on a variety of standard printed circuit boards (PCBs). This packaging also ensures robust handling and a long operational life.

Applications for the MC74AC161N are diverse, ranging from simple counting operations to more complex system clock management, data processing, and automation tasks. Whether used in industrial, commercial, or consumer electronic products, the MC74AC161N from ON Semiconductor is a reliable and efficient choice for designers in need of a precise and high-speed binary counting solution.