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Notes: Computer Organization and Architecture/Introduction To Computer Organization and Architecture

This document discusses digital logic gates. It describes the logic symbol and truth table of an OR gate, showing how OR gates are arranged internally in an integrated circuit. It also explains that a NOT gate, also called an inverter, outputs a 0 when its single input is 1 and vice versa. The Boolean expression for a NOT gate is simply Q=A.

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261 views1 page

Notes: Computer Organization and Architecture/Introduction To Computer Organization and Architecture

This document discusses digital logic gates. It describes the logic symbol and truth table of an OR gate, showing how OR gates are arranged internally in an integrated circuit. It also explains that a NOT gate, also called an inverter, outputs a 0 when its single input is 1 and vice versa. The Boolean expression for a NOT gate is simply Q=A.

Uploaded by

BineilKcThapa
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Computer Organization and Architecture/Introduction to Computer Organization and Architecture

Notes

Figure 1.6 depicts logic symbol and truth table of OR gate.


Figure 1.6: Logic Symbol and Tr uth Table of OR
Gate

Figure 1.7 depicts how OR gates are placed within an IC.


Figure 1.7: Internal Structure of IC 7432

In the figure, pin number 1, 2, 4, 5, 9, 10, 12, and 13 are the inputs to the OR gate, while 3, 6, 8, and
11 are the OR outputs. Pin number 7 is connected to the ground and pin number 14 is connected
to the power supply.
NOT Gate
In digital electronics, the NOT gate is also known as inverting buffer or a digital inverter element.
A NOT gate is basically a single input device. It has an output level that is often at logic level 1.
However, it goes LOW to a logic level 0 whenever the single input is at logic level 1. The
output from a NOT gate returns HIGH when its input is at logic level 0.
The Boolean expression of NOT gate is Q=A

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