Question

Which of the following converts the seven external pins into a 3-bit binary code?

(a) priority encoder

(b) 4-to-2 priority encoder

(c) LS148 7-to-3

(d) 2-to-4 priority encoder

The question was posed to me in semester exam.

This question is from The mechanism of Interrupts topic in chapter Interrupts and Exceptions of Embedded Systems

Answer 1

Right choice is (c) LS148 7-to-3

The explanation: The LS148 7-to-3 priority encoder can convert the seven external pins into a three-bit binary code.