逻辑加法器与减法

部件型号	厂商	描述
74HC283PW	NXP Semiconductors	Logic Adder & Subtractor 4-BIT FULL ADDER W/FAST CARRY
74HC283D-T	NXP Semiconductors	Logic Adder & Subtractor 4-BIT FULL ADDER W/FAST CARRY

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