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5.5 LOGIC CIRCUIT http://part66.blogspot.com/
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EASA Part 66 Module 5.5 : Logic Circuit

Nov 11, 2014

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AND + OR + NAND + NOR + EX NOR + Application

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Page 1: EASA Part 66 Module 5.5 : Logic Circuit

5.5 LOGIC CIRCUIT

http://part66.blogspot.com/

Page 2: EASA Part 66 Module 5.5 : Logic Circuit

LOGIC SYSTEMS

• System performs calculation or makes decisions • A logical operation on one or more logic inputs

and produces a single logic output to make decision.

• Using electronic component that can conduct electricity based on a rule either analog or digital.

• Primarily implement using diodes or transistor acting as electronic switch

Page 3: EASA Part 66 Module 5.5 : Logic Circuit

POSITIVE AND NEGATIVE LOGIC

• Binary digits are use for the input in logic gate• Positive logic : Low voltage = 0

High voltage = 1• Negative logic : Low voltage = 1

High voltage = 0* Normally use positive logic

Page 4: EASA Part 66 Module 5.5 : Logic Circuit

OR GATE

X

X = A + B

A B X0 0 00 1 11 0 11 1 1

IF GOT 1 = RESULT MUST BE 1

Page 5: EASA Part 66 Module 5.5 : Logic Circuit

AND GATE

X = A.B

A B X0 0 00 1 01 0 01 1 1

IF GOT 0 = RESULT MUST BE 0

Page 6: EASA Part 66 Module 5.5 : Logic Circuit

NOT GATE

A X0 11 0

Page 7: EASA Part 66 Module 5.5 : Logic Circuit

NAND GATE

A B X0 0 10 1 11 0 11 1 0

X

Page 8: EASA Part 66 Module 5.5 : Logic Circuit

NOR GATE

A B X0 0 10 1 01 0 01 1 0

X

Page 9: EASA Part 66 Module 5.5 : Logic Circuit

EXCLUSIVE OR GATE

A B X0 0 00 1 11 0 11 1 0X

Page 10: EASA Part 66 Module 5.5 : Logic Circuit

EXCLUSIVE OR GATE

C B A X0 0 0 00 0 1 10 1 0 10 1 1 01 0 0 11 0 1 01 1 0 01 1 1 1

Any ODD number of Inputs gives X

X

Page 11: EASA Part 66 Module 5.5 : Logic Circuit

EXCLUSIVE NOR GATE

A

BX

X

A B X0 0 10 1 01 0 01 1 1

Page 12: EASA Part 66 Module 5.5 : Logic Circuit

GATE TABLE

A B OR NOR AND NAND EX-OR EX-NOR

NOT A

0 0 0 1 0 1 0 1 10 1 1 0 0 1 1 0 11 0 1 0 0 1 1 0 01 1 1 0 1 0 0 1 0

Page 13: EASA Part 66 Module 5.5 : Logic Circuit

UNIVERSAL GATE

• NAND gate is universal gate• It can make another gate

NOT GATE

OR GATE

B

AND GATE

Page 14: EASA Part 66 Module 5.5 : Logic Circuit

IC - INTEGRATED CIRCUIT

Quad 2-input AND Gate 7408

Page 15: EASA Part 66 Module 5.5 : Logic Circuit

ADDERS

• An adder or summer is a digital circuit that performs addition of numbers.

• For new processor, adder are use to calculate addresses, table indices (database).

• The most common adders operate on binary numbers

Page 16: EASA Part 66 Module 5.5 : Logic Circuit

HALF ADDER CIRCUIT

• Required 2 input and provide 2 output• Combination of an exclusive OR and an AND

gate

A B SUM CARRY0 0 0 00 1 1 01 0 1 01 1 0 1

SUM = A BCARRY = A . B

Page 17: EASA Part 66 Module 5.5 : Logic Circuit

FULL ADDER CIRCUIT

• Required 3 input provide 2 output• Combination of 2 half adder and OR gate.

A B Cin Cout S0 0 0 0 01 0 0 0 10 1 0 0 11 1 0 1 00 0 1 0 11 0 1 1 00 1 1 1 01 1 1 1 1

INPUTS OUTPUTS

Page 18: EASA Part 66 Module 5.5 : Logic Circuit

AIRCRAFT LOGIC CIRCUIT

• LANDING GEAR WARNING CIRCUIT

Page 19: EASA Part 66 Module 5.5 : Logic Circuit

AIRCRAFT LOGIC CIRCUIT

• FLIGHT DIRECTOR GYRO FLAG - drop when gyro system malfunction either loss of vacuum or electrical signal

Error Flag

Page 20: EASA Part 66 Module 5.5 : Logic Circuit

GYRO FLAG SYSTEM

Page 21: EASA Part 66 Module 5.5 : Logic Circuit

SERVO ALTIMETER OFF FLAG• Correct operating when sin outputs (‘0’) and the cos

outputs (‘1’).• When total output is 1, it will energising the OFF Flag

coil, removing the flag from view.