双全加器74LS183 Co A B C C Co Co (a)74LS183的逻辑图 (b)全加器的图形符号 S=(AB'C+ABC'+A'BC+A'B'C') =AB'C+A'BC+AB'C+ABC Co=(B'CI+BA'+A'CI) =AB+AC+BC双全加器74LS183 I I O I I I I I I I I I I ( ) ( ) AB AC BC C B C B A A C AB C A BC A B C ABC S AB C ABC A BC A B C = + + =   +   +    =   +   +   + =  +  +  +    