MC74HC390ADTR2G

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• Introduction

The MC74HC390ADTR2G is a dual counter that is used for a variety of applications. It is an integrated circuit from the widely-used 74HC family of high-speed CMOS logic devices. The MC74HC390ADTR2G is a high-speed, low-power device that uses two separate four-stage asynchronous binary counters. It has two output comparator circuits to allow for periodic counting. The MC74HC390ADTR2G is an industrial grade device that can be used in a variety of applications.

• Application field

The MC74HC390ADTR2G is well suited for applications such as frequency division, time-delay systems, pulse-width modulation, rate control, and pulse counting. The device is ideal for applications where low power consumption and high-speed switching is required, such as industrial process and automotive systems.

• Working Principle

The MC74HC390ADTR2G is composed of two four-stage asynchronous binary counters. The internal architecture of the MC74HC390ADTR2G is based on two four-stage ripple counters connected in cascade. The output of one ripple counter is clocked as the input of the other counter. The counters can be presettable through a serial Input (CARRY IN) and connected in either parallel or cascaded configuration for greater counter resolution. The circuit also includes two output comparators to allow for periodic counting. The state of the two output comparator outputs can be used for alarm actuation or display purposes.

The two output comparators can be used to detect a specific count or one of a sequence of counts. The output of the output comparators is available at separate pins, so it is easy to use the MC74HC390ADTR2G with external logic to detect a "long" overflow state or a "short" overflow condition. This feature makes the MC74HC390ADTR2G ideal for applications such as frequency division, time-delay systems, pulse-width modulation, rate control, and pulse counting.

• Conclusion

The MC74HC390ADTR2G is a highly versatile device and is well suited for a wide variety of applications. Its low power consumption and fast switching makes it ideal for industrial process and automotive systems. The device is also easy to use as it includes two output comparators to allow for periodic counting. By using the outputs of the comparators, complex logic and control can be implemented for a variety of applications.

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