Lab Report Example-1

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University of Houston *

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3441

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Computer Science

Date

Feb 20, 2024

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pdf

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5

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ECE-3441-22041 – Spring 2022 Lab 1: TTL Characteristics and SimUAid Your Name Overview: Goals of the Lab This lab introduces the basics of logic circuit through 74LS00 TTL chip. Students will learn how to read a chip’s configuration, functions, electrical characteristics and operating conditions in the manufacturer’s datasheet. The lab also includes an introduction to SimUAid, a simulation software for logic circuits. Step-by-Step Procedures and Results Part 1: Getting Familiarized with the 74LS00 TTL Chip 74LS00 is a 14-pin device. It is a member of logic gate series of digital electronics. It is a TTL (Transistor to Transistor Logic). It represents _____ logic gate. The IC has four ___ gates hence it is called “________ gate”. It has total ___ input and ____ output pins Figure 1: Image of a SN74LS00N chip 1. Noticed that there are five fields in part number SN-74-LS-00-N. What do they indicate about this chip? SN indicates … 74 indicates … LS indicates … 00 indicates …
N indicates … 2. Using the datasheet, how many inputs to outputs are there in this TTL chip? Your answer…. 3. Using the datasheet, what are pins 7 and 14 used for? Your answer…. Link to the datasheet: https://www.ti.com Part 2: TTL Characteristics of the 74LS00 TTL Chip Table 1: Characteristics of 74LS00 TTL Chip V OH min [V] V IH min [V] V IL max [V] V OL max [V] V CC [V] I OL max [A] I OH max [A] I IL max [A] I IH max [A] 4. Explain what Fan-in and Fan-out means and how it is used in digital logic design. Then calculate the Fan-in and Fan-out of the 74LS00 TTL chip. What does the calculations imply? Fan-in is …. Fan-out is …
Fan-in = 𝐴 𝐵 = 𝑥 Fan-out = 𝐶 𝐷 = 𝑦 For fan-in, the calculation implies … For fan-out, the calculation implies … 5. Explain what Pull-up and Pull-down resistors mean and how it is used in digital logic design. Then calculate the Pull-up and Pull-down resistors for the 74LS00 TTL chip. What are the implications of these ranges? Pull-up and Pull-down resistors are … For 74LS00 TTL chip: Pull-up resistor: __[ Ω ] (show your calculations) The value of R indicates … Pull-down resistor: __[ Ω ] (show your calculations) The value of R indicates … 6. What will happen if you do not include Pull-up or Pull-down resistors to a circuit using TTL chips? Your answer… 7. What does positive logic and negative logic stand for? Could these have a connection with the Pull-up and Pull-down resistors implementation in logic circuits? Your answer… Part 3: Software Implementation Using SimUAid
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Figure 2: Logic Circuit of 74LS00 TTL Chip Figure 3: Equivalent Circuit of 74LS00 TTL Chip Table 2: Truth Table for 74LS00 TTL Chip Inputs Output A B Y 1 1 1 0 0 1 0 0 Conclusion
Through this lab, I have learned how to read a datasheet of a TTL chip. From there, I know its function and design, such as its logic circuit, the location of its input, output, ground and power supply pins. From the electrical characteristics and operating conditions, I can find its noise margin, further understand how the chip translate electrical currents into Boolean constants. I also learned how to use SimUAid to create a simulation of logic circuits and analyze its functions.

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