CD74HC85M96 Integrated Circuits (ICs)

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CD74HC85M96 is a 4-bit magnitude comparator manufactured by Texas Instruments. It belongs to the 74HC family of logic-level devices and is used to compare two 4-bit binary numbers and indicate their relative magnitude. It is ideal for use in applications where low power consumption, logic-level compatibility, low noise operation and fast response time are required.

Application Field

The CD74HC85M96 was designed specifically to compare two 4-bit binary numbers. Applications include data bus comparators, data validation and transfer, communications systems and electronic control systems. It is used in systems where the relative order of two binary numbers must be determined and where the input numbers may change quickly.

Working Principle

The CD74HC85M96 operates by comparing the magnitudes of two 4-bit binary numbers and providing an output that reflects the relative order of the two numbers. It has two 4-bit binary inputs and three output pins. The “A>B” output pin indicates whether input A is greater than input B and the “A=B” output pin indicates whether input A is equal to input B. The “A≠B” output pin indicates whether input A is less than input B.

The operation of the comparator is very simple. It receives the two 4-bit binary numbers, A and B. The comparator then works its way along the bits of the numbers beginning with the most significant bit. It compares the two bits and assigns a value of 1 to the A>B output pin if the A bit is a 1 and the B bit is a 0. It assigns a value of 1 to the A=B output pin if the A bit and the B bit are both either a 0 or a 1. Finally, it assigns a value of 1 to the A≠B output pin if the A bit is a 0 and the B bit is a 1. This will result in one, and only one, of the output pins being active at any one time.

The CD74HC85M96 also includes a notch enable circuit. This circuit allows the user to ignore the content of the least significant bit and only compare the three most significant bits. This is accomplished by applying an appropriate logic signal to the “Notch” pin. This can be very useful if the comparator is being used in a system where the least significant bit is not important.

Conclusion

The CD74HC85M96 is a versatile 4-bit binary magnitude comparator which is ideally suited for applications such as data bus comparators, data validation and transfer, communications systems, and general purpose control systems. It provides fast response time and low power consumption in logic-level compatible operation. By utilizing the Notch enable circuit, the relative order of two 4-bit binary numbers can be determined with three of the four bits, ignoring the least significant bit if needed.

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