74HC688 - 8-bit Magnitude Comparator - Hitachi -> Renesas Electronics Datasheet

The HD74HC688 compares bit for bit two 8-bit words and indicates whether or not they are equal. The P=Qoutput indicates equality when it is low.

A single active low enable is provided to facilitate cascading of several packages and enable comparison of words greater than 8-bits.

This device is useful in memory block decoding applications, where memory block enable signals must be generated from computer address information.