74HCT390DB,118

The 74HCT390DB, also known as a dual 4-stage binary ripple counter, is an integrated circuit (IC) device from the 74xx family of CMOS logic ICs. It is used in a variety of numerical applications, doing exactly what its name implies: counting things. The 74HCT390DB is one of the most popular dual 4-stage binary ripple counters available in today\'s market, and it stands above its contemporaries in terms of performance, reliability, and affordability.

Applications

The 74HCT390DB can be found in many applications that are numeric-based. It is used as a digital counter in motor speed control systems, event counters, linear counter applications, frequency divisions, and various other timing circuits. In short, its uses are nearly unlimited, ranging from commercial applications to hobby projects.

Working Principle

The basic working principle of the 74HCT390DB can be broken down to its two main elements: the 4-stage ripple counter and the dual-binary counter. The 4-stage ripple counter operates by dividing the system clock signal into four parts. Each stage is composed of a pair of flip-flops and synchro-clock pulses, which are used to trigger the flip-flops. This counter counts down from 15 to 0, incrementing the count for each stage as it does so. The dual-binary counter operates by taking the output of the 4-stage ripple counter and dividing it further into two binary signals: A and B. This creates a 4-bit binary count from 0-15, which can be used for further applications.

Conclusion

The 74HCT390DB is one of the most versatile and capable IC devices available on the market, offering excellent performance and reliability at a reasonable cost. This makes it suitable for a wide range of applications, ranging from commercial to hobby projects. Whether you\'re looking for a simple frequency-dividing counter or a complex digital counter for motor control, the 74HCT390DB is an excellent choice.