PURPOSE: This lab will allow you
to gain familiarity with the use of basic laboratory equipment, and with
basic logic gates (AND, OR, NAND, NOR).
EQUIPMENT NEEDED: IDL-800 Digital Lab trainer (IDL-800), DVM leads
PARTS NEEDED: 7400, 7402, 7408,
7432, wire.
Note how an integrated circuit's (IC's) pins are numbered. One end of the IC is marked with a small indentation in its plastic case. The indentation is indicated by a small rectangle in the drawing above. The pins are numbered in the counter-clockwise direction starting in the corner next to indentation. An alternate marking for ICs is a small circular dot right next to pin 1. You may encounter either type of markings on the ICs used in this lab.
The numbers given to the ICs (7400, 7402, 7408 & 7432) are generic
numbers. For the real ICs you will be using in these labs the part numbers
have additional letters which vary from one manufacturer to another. A
typical IC might be marked SN7400, or SN74LS00, or DM7400N. Many combinations
exist, and often indicate special properties of an IC, but for these labs
you should be concerned only with the generic type of the ICs you use.
PROCEDURE: Complete each of the exercises detailed below, and record your results on your laboratory report. Have the lab instructor check your report and sign your compliance form after part 4. Turn in your signed compliance form with your laboratory report before leaving the laboratory.
Part 1 (25 points):
(a) Install a 7400 (quad 2-input NAND gate) on the breadboard, connecting the pins to the IDL-800 as follows:
Pin 8 to display LED "LED0" Pin 7 to GND (Ground)
Pin 9 to data switch "SW0" Pin 14 to +5 volts
Pin 10 to data switch "SW1"
(b) Complete the voltage table below. Measure both the input voltages and
the corresponding output voltages with the digital voltmeter (DVM) built
into the LT.
| SW1 | SW0 | LED0 |
| Off State Volts | Off State Volts | Output Volts |
| Off State Volts | On State Volts | Output Volts |
| On State Volts | Off State Volts | Output Volts |
| On State Volts | On State Volts | Output Volts |
(c) Assuming positive logic, construct a truth table from the voltage table. What logic function is realized?
(d) Repeat (c) but, assume negative logic. For negative logic assume that the higher voltage state is a logic 0 and the lower voltage state is a logic 1 (both inputs and outputs).
Part 2 (25 points):
Repeat 1(a), (b), (c), and (d) for a 7402 instead of a 7400, connect the new IC as follows:
Pin 10 to display LED "LED0" Pin 7 to GND (Ground)
Pin 8 to data switch "SW0" Pin 14 to +5 volts
Pin 9 to data switch "SW1"
Part 3 (25 points):
(a) Install a 7408 on the breadboard and make the following connections to the IDL-800.
"SW0" -- Pins 1, 4, 9, 12 "SW1" -- Pins 2, 5, 10, 13
"LED0" -- Pin 3 "LED1" -- Pin 6
"LED2" -- Pin 8 "LED3" -- Pin 11
GND -- Pin 7 +5V -- Pin 14
(b) Experimentally determine the truth table for the 7408 and record the
results in the table below. Assume positive logic.
| SW1 | SW0 | LED3 | LED2 | LED1 | LED0 |
| 0 | 0 | ||||
| 0 | 1 | ||||
| 1 | 0 | ||||
| 1 | 1 |
(c) How many and what type gates are found in a 7408?
Part 4 (25 points):
Repeat part 3 (a), (b), and (c) using a 7432 instead of a 7408. Connect the new IC as follows:
"SW0" -- Pins 1, 4, 9, 12 "SW1" -- Pins 2, 5, 10, 13
"LED0" -- Pin 3 "LED1" -- Pin 6
"LED2" -- Pin 8 "LED3" -- Pin 11
GND -- Pin 7 +5V -- Pin 14
CSE 2341 - Lab Number 2 Compliance Form
______________________________________________________________
Student's Name
Student's ID Number
______________________________________________________________
Student's Signature
______________________________________________________________
Lab assistant's approval (Part 5)