74151 IC PDF

Tull For example, consider a data bus that is connected to multiple memory storage units. HTML is not translated! This section is empty; you can help add the missing info by editing this page. A common is the 8: A set of select lines are then used to choose which of those inputs gets produced as output.

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Cost saving[ edit ] The basic function of a multiplexer: combining multiple inputs into a single data stream. On the receiving side, a demultiplexer splits the single data stream into the original multiple signals. The image to the right demonstrates this benefit.

At the receiving end of the data link a complementary demultiplexer is usually required to break the single data stream back down into the original streams. In some cases, the far end system may have functionality greater than a simple demultiplexer; and while the demultiplexing still occurs technically, it may never be implemented discretely.

This would be typical when: a multiplexer serves a number of IP network users; and then feeds directly into a router , which immediately reads the content of the entire link into its routing processor; and then does the demultiplexing in memory from where it will be converted directly into IP sections.

Often, a multiplexer and demultiplexer are combined together into a single piece of equipment, which is conveniently referred to as a "multiplexer".

Both circuit elements are needed at both ends of a transmission link because most communications systems transmit in both directions. In analog circuit design, a multiplexer is a special type of analog switch that connects one signal selected from several inputs to a single output. Digital multiplexers[ edit ] In digital circuit design, the selector wires are of digital value. In the case of a 2-to-1 multiplexer, a logic value of 0 would connect I.

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