ecen248_lab1

ecen248_lab1 - Dept. of Electrical and Computer Engineering...

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Dept. of Electrical and Computer Engineering TAMU 1 Laboratory Manual for ECEN 248 Lab 1: Introduction to Combinational Design PART I Study of Standard Gates 1.1 Introduction The purpose of this experiment is to introduce you to the basics of circuit wiring, troubleshooting, logic interpretation, and gate behavior. In this lab, you will test the behavior of several of the basic logic gates and you will connect several logic gates together to create simple circuits. 1.2 Background None. 1.3 Pre-lab The T.A. will demonstrate the use of oscilloscopes, power supplies and multimeter in the beginning of this lab. 1.3.1 Pre-lab Deliverables None. 1.4 Lab Procedure We will look at the behavior of some basic logic gates, including inverters, AND gates, OR gates, XOR gates, NAND gates, and NOR gates. Each of these gates is embedded in an integrated circuit package. See Appendix A for the pin-outs, electrical and timing characteristics of these circuits. More detailed specifications may be found in the complete datasheets available on www.alldatasheet.com . 1.4.1 Experiment 1 [1 Point] We will start by setting up the DC power supply and multi-meter for our use. Be sure both are turned off. Then check to see that the multi-meter is set to measure DC, and be sure the red lead is connected to the red multi-meter input that is marked for voltage. Finally, set the scale to the range you need to measure (usually between 0V to 5V for digital circuits). Now, set the DC power supply voltage output to zero (turn the coarse adjustment counterclockwise until it stops). Connect the red lead of the power supply to the red lead of the multi-meter. Likewise, connect the black lead of the power supply to the black lead of the multi-meter. NOTE - Do not connect Power (RED) and Ground (Black) together. This will cause a short. Turn on both the multimeter and the power supply. The multimeter should read very close to zero. Turn the coarse adjustment clockwise until the multimeter reads 5V. If the
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Dept. of Electrical and Computer Engineering TAMU 2 Laboratory Manual for ECEN 248 multimeter display does not change significantly when you turn the coarse adjustment, turn the power supply off and recheck your connections. You may have a short. When the multimeter reads 5V, the adjustments are complete and you should turn off the power supply. You are ready to test your first gate. We will start by wiring a 74ALS04 (inverter) gate. Please refer to the pin configuration given in Appendix A. Insert the 74ALS04 chip onto the breadboard. Be sure you are not shorting pins together. Identify the power (VCC) and ground (GND) pins for the 74ALS04 from the pin-out of the 74ALS04 in Appendix A . Connect the VCC pin to the red lead of the power supply and connect the GND pin to the black lead of the power supply. This chip (7404) contains 6 different inverter gates. Each inverter gate has an input pin and a corresponding output pin. Choose one of the gates and connect the red lead of the multimeter to the gate output. The black
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This note was uploaded on 06/16/2011 for the course ECEN 248 taught by Professor Lu during the Spring '08 term at Texas A&M.

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ecen248_lab1 - Dept. of Electrical and Computer Engineering...

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