Gary Plimer 20005

Higher Technological Higher Technological StudiesStudies

Applied Electronics (Outcome Applied Electronics (Outcome 3)3)

G. Plimer 2005G. Plimer 2005

Gary Plimer 20005

Applied Electronics Applied Electronics (outcome 3)(outcome 3)

NOT AND OR

A Z0 11 0

A B Z0

011

0101

00

01

01

11

0101

00

11

A B Z

Basic Logic Gates

Gary Plimer 20005

Applied Electronics Applied Electronics (outcome 3)(outcome 3)

NAND NOR

A B Z0

111

0101

10

10

00

11

0101

10

00

A B Z

Basic Logic Gates

EOR

A B Z

0 00 11 01 1

0110

Pupil Problems 1Pupil Problems 1

Applied Electronics Work Book

Outcome 3, Page 6 Questions 1 to 9

http://www.islay.argyll-bute.sch.uk/subjects/tech/ts/higher/Electronics/ASSIGNMENT3-2.htm

Combinational LogicCombinational 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.

REMOTEBUTTON

TV SETBUTTON

TV ON/OFFSWITCH

CHANNELSELECT

A

B

C

D

Z

A B C D Z

0 0 0 00 0 1 0 00 1 0 1 0

0 1 1 1 11 0 0 1 0

1 0 1 1 11 1 0 1 01 1 1 1 1

0

Pupil Problems 2Pupil Problems 2

Applied Electronics Work Book

Outcome 3, Page 12 Questions 1 to 5

Nand Equivalents 1Nand Equivalents 1

21 3 4 5 6 7

14 13 12 11 10 9 8

+Vcc

Gnd(0V)

Integrated Circuits, (IC’s) come in varying packages. The one shown below is a Quad, 2 Input, Nand IC.

In industry, it is common to restrict the number of IC’s used. This reduces cost, stock levels and assembly requirements.

Nand Equivalents 2Nand Equivalents 2

AND

OR

NOT

Converting to NandsConverting to Nands

NOT = AND =

Substituting NANDS

Original Circuit

Pupil Problems 3Pupil Problems 3

Applied Electronics Work Book

Outcome 3, Page 18 Questions 1 to 4

http://www.islay.argyll-bute.sch.uk/subjects/tech/ts/higher/Index.htm