CD74HC85PWRG4

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Logic - Comparators:

The CD74HC85PWRG4 is a high-performance logic device from Texas Instruments, which is generally used in comparison operations. It is a four-bit synchronous magnitude comparator, using CMOS technology with a power dissipation of 900mW. It operates from a single 3.2V to 5.5V supply, and the operating temperature ranges from -40ºC to +85ºC.

The device has National Semiconductor’s (NS) original network, and the three-state outputs provide flexibility in board layout. The functionality of the device allows for various logic operations such as program and recognize, to be implemented. Moreover, the input signatures allow for pattern recognition.

CD74HC85PWRG4 has a wide range of application fields, such as automotive systems, meeting/party audio systems and microprocessor-based systems. With its effectively low power consumption, it is ideal for the development of various communication systems, such as “bus” communication systems and various “data bus” systems. In these communication systems, the magnitude comparator is used to validate data and transfer information.

The device enables high-speed comparison between two 4-bit binary words. For every clock pulse, two 4-bit words are applied to the inputs and the outputs give the results of the comparison between them. Pulse duration and clock frequency can be adjusted with external R and C components to improve system speed. Its ultra-low power consumption makes it ideal for portable applications.

The four-input logic allows for four functions - A (-) Greater than B (-) with enable; A (-) Less than B (-) with enable; A (-) Greater than B (+) with enable; and A (-) Less than B (+) with enable. The outputs are provided in complementary 3-state differential outputs, allowing the user to set up specific cases which determine the result of the comparison. A logic “1” at the outside input enables the comparator; when the logic “1” is sent to the enable pins, the output of the comparators becomes valid, allowing the user to recognize the differences between the two 4-bit words.

In summary, CD74HC85PWRG4 is a four-bit synchronous magnitude comparator suited for various logic operations like program, recognition and comparison of two 4-bit binary words. Its wide range of application, low power consumption and user-friendliness makes it ideal for various automotive, audio and communication systems.

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