General Description
The MM74HC688 equality detector utilizes advanced silicon-gate CMOS technology to compare bit for bit two 8-bit words and indicates whether or not they are equal. The P Q output 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.

FEATUREs
■ Typical propagation delay: 20 ns
■ Wide power supply range: 2–6V
■ Low quiescent current: 80 PA (74 Series)
■ Large output current: 4 mA (74 Series)
■ Same as HC521