MM74HC85

The MM54HC85/MM74HC85 is a 4-bit magnitude comparator that utilizes advanced silicon-gate CMOS technology. It is designed for high speed comparison of two four bit words.

This circuit MM74HC85 has eight comparison inputs, 4 for each word; three cascade inputs (AkB, AlB, AeB); and three decision outputs (AkB, AlB, AeB). The result of a comparison is indicated by a high level on one of the decision outputs.

Thus it may be determined whether one word is ``greater than,'' ``less than,'' or ``equal to'' the other word. By connecting the outputs of the least significant stage to the cascade inputs of the next stage, words of greater than four bits can be compared. In addition the least significant stage must have a high level applied to the AeB input, and a low level to the AkB, and AlB inputs.

The comparator MM74HC85's outputs can drive 10 low power Schottky TTL (LS-TTL) equivalent loads, and is functionally, and pin equivalent to the 54LS85/74LS85. All inputs are protected from damage due to static discharge by diodes to V_CC and ground.