1. General description

The 74HC85; 74HCT85 is a 4-bit magnitude comparator that can be expanded to almost any

length. They perform comparison of two 4-bit binary, BCD or other monotonic codes and present

the three possible magnitude results at the outputs (QA>B, QA=B and QA

weighted (A0 to A3 and B0 to B3), where A3 and B3 are the most significant bits. For proper

compare operation the expander inputs (IA>B, IA=B and IA

be connected as follows: IAB = LOW and IA=B = HIGH. For words greater than 4-bits, units

can be cascaded by connecting outputs QA>B, QA=B and QA

the significant comparator. Inputs include clamp diodes. This enables the use of current limiting