BUY 74ALS10 https://www.utsource.net/itm/p/4099826.html

Description: The 74ALS10 is a 4-bit binary full adder with fast carry. Features: - High-speed operation: tpd = 11.5 ns (typical) at VCC = 5 V - Low power dissipation: ICC = 4 μA (max) at TA = 25°C - Fanout of 2 LSTTL loads - Fully compatible with all Motorola TTL families Applications: - Arithmetic logic unit - Fast carry look-ahead circuits - High-speed counting - Fast adder/subtractor circuits (For reference only)