Question

A 256 × 4 EPROM has
1. 8 address pins and 2 data pins
2. 8 address pins and 4 data pins
3. 8 address pins and 8 data pins
4. 256 address pins and 4 data pins

Answer 1

Correct Answer - Option 2 : 8 address pins and 4 data pins

Concept:

The total memory can be calculated from the number of address lines and date-lines, i.e.

Total Memory = 2address lines × Data Lines

Calculation:

For a 256 x 4 EPROM, the number of address lines is:

 \({\log _2}256 = {\log _2}{2^{8}} = 8\)

and  number of data lines = 4