# [Other] Computer composition principle decomposition experiment: Experiment 1 basic logic gate logic Experiment

Source: Internet
Author: User
Experiment 1 basic logic Experiment

I. Tutorial Purpose

1. Master the logical relationship between TTL and non-gate, or non-gate, and between exclusive OR gate input and output.

2. Familiar with the appearance, pins and usage of small-scale integrated circuits in TTL.

Ii. devices and instruments used in the experiment

1. Two input four exclusive OR gate 74ls86 1 piece

2. Three-state output four-bus buffer door 74ls125 1 piece

3. four-digit binary counter 74ls161 1 piece

4. 3-8 decoder 74ls138 1 piece

Iii. experiment content

Test the 74ls86, 125, 138, and 161 IC modules and analyze the logical relationship between the input and output modules.

Iv. Lab tips

1. Insert the device to the corresponding socket on the test bench.

2. Connect the Gnd (ground) of the device to the "ground (Gnd)" of the test bench, and connect the VCC (high level) of the device to the + 5 V of the test bench.

3. Use the level switch output of the test bench as the input of the device to be tested. When the switch is switched, the input level of the device is changed.

4. Connect the output pin of the device to the level indicator on the test bench. When the indicator light is on, the output level is 1. If the indicator light is off, the output level is 0.

V. Wiring Diagram and results of the experiment

Part 1: Wiring Diagram and test results of the logic link of the 4-exclusive or 74ls86

1. Exclusive or logical diagram:

3. Experimental results: L = low (low input) and H = high (high output.

Part 2: three-state output four-bus buffer door 74ls125 logical relationship wiring diagram and test results

1. Chip features:

2. Test the Logical Link wiring diagram of 74ls86:

3. Experimental results: L = low (low input) and H = high (high output.

Part 3: four-digit binary counter 74ls161 Logical Link wiring diagram and test results

1. Test the Logical Link wiring diagram of 74ls86:

2. Experiment results:

Part 4: 3-8 decoder 74ls138 Logical Link wiring diagram and test results

1. Test the Logical Link wiring diagram of 74ls138:

2. Experiment results: K3, K4 low, K5 high, input.

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