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BUY SN74LS283N https://www.utsource.net/itm/p/76515.html
4-BIT BINARY FULL ADDER WITH FAST CARRY
Description: The SN74LS283N is a 4-bit binary adder/subtractor with fast carry, designed for use in high-speed bipolar memory systems. Features: - 4-bit binary adder/subtractor - Fast carry - TTL compatible - Low power consumption - High noise immunity Applications: - High-speed memory systems - Arithmetic logic units - Digital signal processing - Data processing systems (For reference only)