Digital Electronics: Principles, Devices and Applications

264 Digital ElectronicsTable 7.2 Functional table of IC 7485 or IC 4585.Comparison inputs Cascading inputs OutputsA 3 ,B 3 A 2 ,B 2 A 1 ,B 1 A 0 ,B 0 A>B AB AB 3 X X X X X X HIGH LOW LOWA 3 B 2 X X X X X HIGH LOW LOWA 3 = B 3 A 2 B 1 X X X X HIGH LOW LOWA 3 = B 3 A 2 = B 2 A 1 B 0 X X X HIGH LOW LOWA 3 = B 3 A 2 = B 2 A 1 = B 1 A 0 Band AB; and X = 0, Y = 0 and Z = 1 for A