74LS85
SN74LS85 4-Bit Magnitude parator
The SN74LS85 is a 4-Bit Magnitude Camparator which pares two 4-bit words (A, B), each word having four Parallel Inputs (A0
- A3, B0
- 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” (OA > B), “A less than B” (OA < B), “A equal to B” (OA = B). Three Expander Inputs, IA > B, IA < B, IA = B, allow cascading without external gates. For proper pare operation, the Expander Inputs to the least significant position must be connected as follows: IA < B= IA > B = L, IA = B = H. For serial (ripple) expansion, the OA > B, OA < B and OA = B Outputs are connected respectively to the IA > B, IA < B, and IA = B Inputs of the next most significant parator, as shown in Figure 1. Refer to Applications section of data sheet for high speed method of paring large words. The Truth Table on the following page describes the operation of the...
