CD74AC283MG4 [Texas Instruments]

These devices add two 4-bit binary numbers and generate a carry-out bit if the sum exceeds 15. Because of the symmetry of the add function, this device can be used with either all active-HIGH operands (positive logic) or with all active-LOW operands (negative logic). Features include buffered inputs, exceeds 2kV ESD protection, SCR-latchup-resistant CMOS process, speed of bipolar FAST with reduced power consumption, balanced propagation delays, AC types: 1.5V to 5.5V operation, balanced noise immunity, 24mA output drive current, fanout to 15 FAST ICs, and drives 50Ω transmission lines.