HEF4585B MSI 4-bit Magnitude Comparator

The HEF4585B is a 4-bit magnitude Comparator which compares two 4-bit words (A and B), whether they are ,less than,,, equal to,, or ,greater than,. Each word has four parallel inputs (A0 to A3 and B0 to B3 ); A3 and B3 being the most significant inputs. Three outputs are provided; A greater than B (OA> B ), A less than B (OA < B) and A equal to B (OA = B). Three expander inputs (IA > B IA < B and IA = B) allow cascading of the devices without external Gates For proper compare operation the expander inputs to the least significant position must be connected as follows: IA = B = IA > B = HIGHIA < B = LOW. For words greater than 4-bits, units CAN be cascaded by connecting outputs OA < B and OA =B to the corresponding inputs of the next significant Comparator (input IA > B is connected to a HIGH). Operation is not restricted to binary codes, the devices will work with any monotonic code. The function table describes the operation of the device under all possible Logic conditions.
By NXP Semiconductors