Topic: Digital Electronics
Without any additional circuitry an 8:1 MUX can be used to obtain
- A. Some but not all Boolean functions of 3 variables
- B. All function of 3 variables but none of 4 variables
- C. All functions of 3 variables and some but not all of 4 variables
- D. All functions of 4 variables
Answer: D. All functions of 4 variables
Explanation: An 8:1 MUX has 3 select lines which can be used to connect 3 of the 4 variables. The 8 data inputs can be connected to the 4th variable, its complement, 0, or 1. Hence, using an 8:1 MUX, we can obtain all functions of 4 variables.