Transistors as Digital Switches: Intro to Logic Gates

Circuits that really count

My sound’s laid down by the (digital) underground…

Operation in Saturation and Cutoff

Binary/Digital Representation

Digital “1” = +5 V = high

Digital “0” = 0 V = low

Inverter (NOT logic gate)

NAND gate

What a real device looks like

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From the data sheet

http://www.ti.com/lit/ds/symlink/sn74ls00.pdf

NOR gate

Design an OR gate

A B Y

0 0 0

1 0 1

0 1 1

1 1 1

Exclusive OR (XOR)

Logic Gate Library

And now, your joke of the day

There are only 10 types of people in the world. Those who understand binary, and those who don’t.

Half-Adder

Teddy KGB’s Oreos Stash

Digital combos

Green LED illuminates when proper code is entered. Ready, set crack the code!

Images and Data From:

http://www.spsu.edu/cs/faculty/bbrown/web_lectures/transistors/

http://pcbheaven.com/scripts/imagepresent.php?filename=%2Fwikipages%2Fimages%2Ftransistorcircuits_1235488532.jpg

http://cpuville.com/logic_gates.htm

http://thalia.spec.gmu.edu/~pparis/classes/notes_101/node115.html

http://www.cs.uakron.edu/~margush/465/03_digitallevel.html

http://faculty.kfupm.edu.sa/COE/ashraf/RichFilesTeaching/COE022_200/Chapter4_1.htm