Higher Technological Studies Gary Plimer 20005
Applied Electronics REVISION G. Plimer 2005
Applied Electronics Gary Plimer 20005
Basic Logic Gates NOT A 0 1
Z 1 0
AND A 0 0 1 1
B 0 1 0 1
Z 0 0 0 1
OR A 0 0 1 1
B 0 1 0 1
Z 0 1 1 1
Applied Electronics Gary Plimer 20005
Basic Logic Gates NAND
NOR
A 0 0 1 1
A 0 0 1 1
B 0 1 0 1
Z 1 1 1 0
B 0 1 0 1
Z 1 0 0 0
EOR A B Z 0 0 0 0 1 1 1 0 1 1 1 0
Pupil Problems 1 ďƒ˜ Applied Electronics Work Book Outcome 3, Page 6 Questions 1 to 9
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Combinational Logic  It is often necessary to use more than one gate in a logic circuit. In these cases, we need to analyse a Combinational Logic circuit.
A B C
REMOTE BUTTON
TV SET BUTTON
TV ON/OFF SWITCH
D CHANNEL SELECT
Z
A B C D Z 0 0 0 0 0 0 0 1 0 0 0 1 0 1 0 0 1 1 1 1 1 0 0 1 0 1 0 1 1 1 1 1 0 1 0 1 1 1 1 1
Pupil Problems 2 ďƒ˜ Applied Electronics Work Book Outcome 3, Page 12 Questions 1 to 5
Nand Equivalents 1 Integrated Circuits, (IC’s) come in varying packages. The one shown below is a Quad, 2 Input, Nand IC. +Vcc 14
13
12
11
10
9
1
2
3
4
5
6
8
7
Gnd (0V)
In industry, it is common to restrict the number of IC’s used. This reduces cost, stock levels and assembly requirements.
Nand Equivalents 2 NOT
OR
AND
Converting to Nands Original Circuit
NOT =
Substituting NANDS
AND =
Pupil Problems 3 ďƒ˜ Applied Electronics Work Book Outcome 3, Page 18 Questions 1 to 4
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