IC快速检索：
型号 / 厂家，封装，批号，备注，订购
DM74S257 / Fairchild Semiconductor,Datasheet,06/07+,3-STATE Quad 1-of-2 订购 PDF文档
DM74S257CW / Fairchild Semiconductor,Datasheet,07+,Quad 3-STATE 2-to-1 订购 PDF文档
DM-74S257N. / ,,,原装现货 订购 PDF文档
DM74S270J / National Semiconductor,Datasheet,07+,General Purpose 订购 PDF文档
DM74S271J / National Semiconductor,Datasheet,07+,General Purpose 订购 PDF文档
DM74S271N / National Semiconductor,Datasheet,07+,General Purpose 订购 PDF文档
DM74S280N? / ,,最新批号,原装现货 订购 PDF文档
DM74S280WM / National Semiconductor,Datasheet,07+,9-Bit Parity Generat 订购 PDF文档
DM74S283 / Fairchild Semiconductor,Datasheet,07+,4-Bit Binary Adder w 订购 PDF文档