CD74HC85E

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The CD74HC85E is a four-bit magnitude comparator used for logic comparison of binary numbers; it is the latest member of the logic family from Texas Instruments. As part of the High-Speed CMOS logic family, the CD74HC85E offers excellent performance with fast switching and low noise. The CD74HC85E has high power supply noise immunity, so it is suitable for many applications that require reliable operation.

Application Field of CD74HC85E:

The CD74HC85E can be used in a wide range of applications including digital logic circuits, such as memory address decoding, digital signal processing and communication systems, while the comparator can also be used in test and measurement equipment, such as oscilloscopes. Additionally, the CD74HC85E can be used in embedded systems and microcontroller applications, where it can act as an input interface for digital logic systems.

Working Principle of CD74HC85E:

The CD74HC85E is a 4-bit magnitude comparator designed to compare two 4-bit binary numbers. It can be used for two\'s complement or straight binary comparisons. The comparator consists of four comparator circuits, each of which compares two bits at the same time. The outputs from the four comparator circuits are then ORed together to produce the final output. The comparator has two sets of outputs which indicate the relative magnitude of the two numbers. The outputs are ‘A>B’ and ‘B>A’ which, when both are ‘LOW’, indicate that the numbers are equal.

The logic diagrams of the CD74HC85E are shown below. As shown, the comparator consists of four full-wave comparator circuits connected in series. Each of the comparator circuits is composed of two operational amplifiers and one 4-bit comparator circuit. The positive input of each operational amplifier is connected to the reference voltage, while the negative input of the first operational amplifier is connected to the A input and the negative input of the second operational amplifier is connected to the B input. The outputs of the four comparator circuits are then connected to the OR gate which produces the output ‘A>B’ and the output ‘B>A’.

The CD74HC85E is a low power consuming comparator designed for applications where power is limited. It is a 4-bit magnitude comparator that can be used for two\'s complement or straight binary comparison. The comparator consists of four comparator circuits that are connected in series, each of which compares two bits at a time. The outputs of the four comparator circuits are then ORed together to produce the final output. The CD74HC85E is suitable for many applications that require reliable operation due to its high power supply noise immunity.

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