型号：DM74LS257BN
厂商：NSC[National Semiconductor]
大小：163.7 Kbytes
页数：共8页
功能：TRI-STATE Quad 2-Data Selectors/Multiplexers
厂商：FAIRCHILD[Fairchild Semiconductor]
大小：56.55 Kbytes
页数：共5页
功能：3-STATE Quad 2-Data Selectors/Multiplexers
