Digital Logic Gates
1. Figure 1: AND gate using NOR gates
Input
A
0
0
1
1
B
0
1
0
1
Output
Z = (A+B)’
1
0
0
0
B
0
1
0
1
Output
Z = (A◦B)’
1
1
1
0
2. Figure 2: OR gate using NAND gates
Input
A
0
0
1
1
3. Figure 3: Half Adder
Input
A
0
0
1
1
Output
B
0
1
0
1
Sum
0
1
1
0
B
0
1
0
1
Sum
N/A
1
0
N/A
Carry Out
0
0
0
1
4. Figure 4: SR Flip – Flop
Input
A
0
0
1
1
Output
Design 1
Z= A+B
Carry Out
N/A
0
1
N/A
̅+ B
̅∙B
̅= A
̅
Z̅ = A
̅∙B
̅
Z̿ = ̅̅̅̅̅̅
A
Input
A
0
0
1
1
B
0
1
0
1
Output
̅
𝑨
1
1
0
0
̅
𝑩
1
0
1
0
̅∙𝐁
̅
𝐙̿ = ̅̅̅̅̅̅
𝐀
0
1
1
1
Design 2