a) Draw the block diagram, obtain the truth table, produce the Boolean expression
and draw the logic circuit for the following devices:
i. 2 to 4 decoder
ii. 4 to 1 multiplexer
[6 marks]
b) A logic circuit is to be designed which has 4 inputs, ABCD. The circuit is required
to generate output LOW when two or more of the inputs are HIGH. The design
should include the following:
i. The truth table
[8 marks]
ii. The simplest logic expression using k-map
[6 marks]
iii. Logic circuit