2-19Figure 2-18. —Comparison of NAND gate and AND gate with inverted inputs: A. NAND gate; B. AND gate with inverterson each input.Figure 2-19. —NAND gate with one inverted input.OR/NOR GATE VARIATIONSThe outputs of OR and NOR gates may also be changed with the use of inverters.An OR gate with one input inverted is shown in figure 2-20. The output of this OR gate requires thatA be LOW, B be HIGH, or both of these conditions existing at the same time in order to have a HIGHoutput. Since the A input is inverted, it must be LOW if B is LOW in order to produce a HIGH output.Therefore the output is f = A +B.
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