Transistors and Logic Circuits. Transistor control voltage in voltage out control high allows current to flow -- switch is closed (on) control low stops.

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Presentation transcript:

Transistors and Logic Circuits

Transistor control voltage in voltage out control high allows current to flow -- switch is closed (on) control low stops current flow switch is open (off)

NOT Gate One transistor In Out In = high, switch is closed so current flows to ground Out is low. V (high voltage) In = low, switch is open so current flows to Out Out is high

NOR Gate Two transistors In 1 Out V (high voltage) In 2 In 1 = 1, Out = 0 In 2 = 1, Out = 0 In 1 = 0 In 2 = 0, Out = 1

NAND Gate Two transistors In 1 Out V (high voltage) In 2 In 1 = 1, In 2 = 1, Out = 0 In 1 = 1 In 2 = 0, Out = 1

AND Gate Three transistors In 1 V (high voltage) In 2 Out V

Logic Gates In 0 1 Out AND Gate OR Gate In 0 1 Out XOR Gate In 0 1 Out InOut NOT Gate

Logic Circuit -- 4 input Multiplexor Control 1 0 In Out 0 1

Logic Circuit Puzzle 1 A0 B0 A1 B1 A2 B2 A3 B3 A4 B4 A5 B5 A6 B6 A7 B7 Out Input Binary Numbers A, B 8 bit Comparator Output 1 if A = B Otherwise 0

Logic Circuit Puzzle 2 In 2 In 1 In 0 D2 D3 D4 D5 D6 D7 D0 D1 3 bit Decoder Select Output Line

Programmable Logic Array Any Logic Truth Table can be implemented Uses block of AND gates followed by block of OR gates Programmable –once –many times Used for implementing different circuits

Truth Table to Normal Form A B C expression (A and B and C) or (A and B and ~C) or (A and ~B and C) or (~A and B and C) A and B and C A and B and ~C A and ~B and C ~A and B and C

PLA AND Gates OR Gates Input Output

PLA In 0 In 1 In 2 Out 0 Out 1 What is Out 1?

Normal Form to Truth Table A B C expression (A and B and C) or (A and ~B and ~C) or (~A and B and ~C) or (~A and ~B and C) A and B and C A and ~B and ~C ~A and B and ~C ~A and ~B and C Odd Parity

PLA, Alternate Representation AND Block uses DeMorgan Equivalence A and B = not (not A or not B) V OR Block uses direct or

PLA, Alternate Representation A B C Outputs Unused

PLA, Alternate Representation Burned out to disconnect

PLA "Don't Cares" A B C exp A B C exp 1 1 X X = Don't Care

B C PLA "Don't Cares" A B C A Reduce number of PLA lines used for expression