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By Delmar Thomson

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The gate performs its designated function only when all inputs are HIGH. The OR gate requires input A OR input B to be HIGH for its output to be HIGH. The HIGH active levels are shown by the absence of bubbles or arrows on the terminals. 1 A 4-input gate has input variables A, B, C, and D and output Y. 2 OR. 2 Logic Switches and LED Indicators Before continuing on, we should examine a few simple circuits that can be used for input or output in a digital circuit. Single-pole single-throw (SPST) and pushbutton switches can be used, in combination with resistors, to generate logic voltages for circuit inputs.

The pins are numbered counterclockwise from that point. 1 Upon successful completion of this chapter you will be able to: • Explain the relationship between the Boolean expression, logic diagram, and truth table of a logic gate network and be able to derive any one from either of the other two. • Draw logic gate networks in such a way as to cancel out internal inversions automatically (bubble-to-bubble convention). • Write the sum of products (SOP) or product of sums (POS) forms of a Boolean equation.

10. Logic gates can be used to pass or block digital signals. For example, an AND gate will pass a digital signal applied to input B if the input A is HIGH (Y ϭ B). If input A is LOW, the signal is blocked and the gate output is always LOW (Y ϭ 0). 20. 11. Tristate buffers have outputs that generate logic HIGH and LOW when enabled and a high-impedance state when disabled. The high-impedance state is electrically equivalent to an open circuit. 51 12. Logic gates are available as integrated circuits in a variety of packages.

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