The CD4585B is a 4-bit magnitude comparator designed for use in computer and logic applications that require the comparison of two 4-bit words. This logic circuit determines whether one 4-bit word (Binary or BCD) is "less than", "equal to", or "greater than" a second 4-bit word.

The CD4585B has eight comparing inputs (A3, B3, through A0, B0), three outputs and three cascading inputs that permit systems designers to expand the comparator function to 8, 12, 16.....4N bits. Cascading these units for comparison of more than 4 bits is accomplished.