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Electronic Labs_75

Electronic Labs_75 - 1 ii A.“ n Fig 3-4 Recall from the...

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Unformatted text preview: 1 - ii A.“ n.- Fig. 3-4 Recall from the previous lesson that inverting the inputs and output gave the OR function using AND gates and the AND function using OR gates. In the same way, NOR and NAND functions are shown in Fig. 3-5 providing opposite functions. The circuits in 3-5a and 3—5b would be constructed using four NAND or four NOR gates respectively including the inverters. Note that if comple- mentary inputs A and B were available o_n1y two gates fie required to give outputs Y= A—+B and Y = AB for each Circuit. ‘4qu it”) Ylfi (b) Fig. 3-5 From Fig. 3-5 also it follows that a NOR gate can be used for an AND operation with inverted inputs and a NAND gate can be used to perform the OR operation with inverted inputs. Note that if the last inverter were eliminated from each circuit, the outputs would be X = A+B and X = AB, giving the OR and AND functions. Tables 3-6 and 3-7 Show inputs and outputs for the circuits in Fig. 3-5. INPUTS OUTPUTS INVERTED Table 3-6 NAND/NOB Logic Gates 3-3 INPUTS OUTPUTS INVERTED —-- 0 0 0 1 Table 3-7 The equivalency of gates is tabulated in Table 3-8 on the following page along with a statement of the logic function, truth table, switch analogy and stande symbology. Exercise Procedure D 3.a)Connect the logic Circuit shown in Fig. 3-6a. Cl b) Turn on the trainer power. [I c) Record the inputs and outputs in truth table of Fig. 3-6b. I'M The table should indicate the operation of an AND gate; that only when inputs A and B are 1 the output Y will be 1. ...
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