Question

BCD adder can be constructed with 3 IC packages each of ____________

(a) 2 bits

(b) 3 bits

(c) 4 bits

(d) 5 bits

I got this question in homework.

My doubt is from BCD Adder in section Arithmetic Circuits of Digital Circuits

Answer 1

Right option is (c) 4 bits

The explanation: Binary-coded decimal (BCD) is a class of binary encodings of decimal numbers where each decimal digit is represented by a fixed number of bits, usually four or eight. BCD adder can be constructed with 3 IC packages. Each of 4-bit adders is an MSI(Medium scale Integration) function and 3 gates for the correction logic need one SSI (Small Scale Integration) package.