品番	メーカー/ブランド	簡単な説明
CD4556	INTERSIL	CMOS Dual Binary to 1 of 4 Decoder/Demultiplexers IC
CD4556BD	RCA	CD4556BD RCA IC ORIGINAL
CD4556BE @@@@@@@@@@@	HARRIS	CD4556BE HARRIS IC DIP16
CD4556BEX	HARRIS	CD4556BEX HARRIS IC ORIGINAL
CD4556BFX	RCA	CD4556BFX RCA IC CDIP
CD4556BMS	INTERSIL	CMOS Dual Binary to 1 of 4 Decoder/Demultiplexers IC