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Transcript
Basic Logic Gates ECET 111 NAME ___________________ COMPONENTS Breadboard Wire LED 330 ohm and 1k ohm Resistor 7400, 7402, 7404, 7408 and 7432 OBJECTIVE Under stand the operation AND, OR, NAND, NOR and NOT gates. Create a small logic probe. Create a simple switched input. Under stand the use of combinational logic and how to generate Boolean equations. CONSTRUCTION AND TESTING 1. A simple logic probe can be created by using an inverter, resistor and light emitting diode (LED). Construct the circuit below and test the simple logic probe. Note: Keep this circuit if you do not have a logic probe. 1a. Enter the above circuit into Multisim and simulate circuit. Print out the circuit and attach to lab report. 2. A simple switch circuit can be used to simulate an input(s). Construct the circuit below and test the output with a logic probe. Check the output using the logic probe you constructed in PART 1. Note: Using a switch to simulate the input to a logic gate is optional in our experiments. The resistor in the switch circuit is used for current limiting purpose. This current limiting is not required for TTL devices so a simple wire from VCC or GRND can be used to input a 0 or 1 to your circuit. 3. Construct the following AND gate circuit. Test the circuit and fill in the corresponding truth table. A B X What will be the Boolean equation at X? 2. Construct the following OR gate circuit. Test the circuit and fill in the corresponding truth table. A What will be the Boolean equation at X? B X 3. Construct the following NOT gate circuit. Test the circuit and fill in the corresponding truth table. A Y Z What will be the Boolean equation at Y and Z? 4. Construct the following NAND gate circuit. Test the circuit and fill in the corresponding truth table. A B X What will be the Boolean equation at X? 5. Construct the following NOR gate circuit. Test the circuit and fill in the corresponding truth table. A What will be the Boolean equation at X? B X 6. Construct the following Combinational Logic circuit. Test the circuit and fill in the corresponding truth table. (Instructor signature needed) A B C X What will be the Boolean equation at X? Identify the Boolean equation at each point in the circuit. QUESTONS 1. Explain the operation of a AND, OR and NOT gate in words only. 2. What are the three basic logic gates? Why are they called the three basic logic gates? 3. Where is Pin 1 located on an integrated circuit (IC)? 4. Create the schematic for the following Boolean equations. _ Z= (AB+C)C + A 5. Using only a 7408, show how you could construct a 4 input AND gate.