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Enable input

Commercial decoders include one or more enable inputs to control the operation of the circuit. The decoder of Fig. 2-1 has one enable input, E. The decoder is enabled when E is equal to 1 and disabled when E is equal to 0.

Figure 2-1

The operation of the decoder can be clarified using the truth table listed in Table 2-1. When the enable input E is equal to 0, all the outputs are equal to 0 regardless of the values of the other three data inputs. The three x's in the table designate don't-care conditions. When the enable input is equal to 1, the decoder operates in a normal fashion. For each possible input combination, there are seven outputs that are equal to 0 and only one that is equal to 1. The output variable whose value is equal to 1 represents the octal number equivalent of the binary number that is available in the input data lines.

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