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Buffers

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Buffers do not affect the logical state of a digital signal, i.e., a logic 1 input results in a logic 1 output whereas a logic 0 input results in a logic 0 output. Buffers are normally used to provide extra current drive at the output but can also be used to regularize the logic levels present at an interface. The Boolean expression for the output, Y, of a buffer with an input, X, is:

Y = X

Note:- the response of a gate or circuit to an input, or set of inputs, can be expressed in a number of ways. One of the most simple and most intuitive methods is the truth table shown here where the logic for any given input, X, is shown at the output, Y.

The algebraic system used to express the relationship between inputs and outputs in a circuit is called 'Boolean logic'.

Logic 0 Logic 1

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