TI SN74LS85NS

The 54LS85 is a 4-Bit Magnitude Comparator which compares two 4-bit words (A, B), each word having four Parallel Inputs (A - A₃; B - B₃), A₃, B₃ being the most significant inputs. Operation is not restricted to binary codes, the device will work with any monotonic code. Three Outputs are provided: “A greater than B” (O A > B), “A less than B” (O A < B), “A equal to B” (O A = B). Three Expander Inputs, I A > B, I A < B, I A = B allow cascading without external gates. For proper compare operation, the Expander Inputs to the least significant position must be connected as follows: I A < B = I A > B = L, I A = B = H. For serial (ripple) expansion, the O A > B, O A < B and O A = B outputs are connected respectively to the I A > B, I A < B and I A = B inputs of the next most significant comparator.

• Easily Expandable
• Binary or BCD Comparison, O A > B, O A < B and O A = B Outputs Available