MM54HC688/MM74HC6888-Bit Magnitude Comparator (Equality Detector)General Des criptionThis equality detector utilizes advanced silicon-gate CMOStechnology to compare bit for bit two 8-bit words and indicateswhether or not they are equal. The PeQ output indicatesequality when it is low. A single active low enable isprovided to facilitate cascading of several packages and enablecomparison of words greater than 8 bits.This device is useful in memory block decoding applications,where memory block enable signals must be generatedfrom computer address information.The comparator's output can drive 10 low power Schottkyequivalent loads. This comparator is functionally and pincompatible to the 54LS688/74LS688. All inputs are protectedfrom damage due to static discharge by diodes to VCCand ground.FeaturesY Typical propagation delay: 20 nsY Wide power supply range: 2±6VY Low quiescent current: 80 mA (74 Series)Y Large output current: 4 mA (74 Series)Y Same as 'HC521