Pre Lab Exercises.
 

1.    Symbols and truth tables.

 
       Please refer to the discussion for OR gate, Nor gate, AND gate, NAND gate, NOT gate and EXOR gate.
 
 

3.    Assign pin numbers.
 
     Quadriple 2-input
     positive - or gates
              32
         Y = A + B

Input
Output
        1                      2
3
        4                      5
6
        9                     10
8
      12                     13
11
 
 

4.

a)
Inputs
X
Outputs
Z
0
0
1
1
 
b)          Z = X

c)         one.
 
 

5.  Combinational circuit.

d)  3 ICs needed for the circuit implementation.

     Please refer to TABLE 1.9 for the truth table.
 

- NAND gates implementation circuit.
 

d)  One IC needed for the circuit implementation.
 
 
     P                 Q                      R
S
     0                  0                      0 
     0                  0                      1 
     0                  1                      0 
     0                  1                      1 
     1                  0                      0 
     1                  0                      1   
     1                  1                      0 
     1                  1                      1
1
1
1
1
0
0
0
1
 
6. Advantages using NAND gates:-
    i) Less ICs needed for a single circuit implementation - cheaper.
   ii) Less power dissipation - less heat dissipated.