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Unformatted text preview: This can easily be done with a single quad two-input NAND gate, as shown in the circuit below: There are many ways in which the simple logic gates we have examined can be combined to perform useful functions. Some of these circuits produce outputs which are only dependent upon the current logic states of all inputs. These are called combinational logic circuits. Other circuits are designed to actually remember the past states of their inputs, and to produce outputs based on those past signals as well as the current states of their inputs. These circuits can act in accordance with a sequence of input signals, and are therefore known as sequential logic circuits. In these pages, we will look first at combinational circuits. Then we will move on to sequential circuits. If you wish to skip immediately to sequential circuits, use the navigational links at the top of this page to select the type of circuit you would like to examine....
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- Winter '09
- Integrated Circuit, Logic gate, XOR gate