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| Part Number | DM74LS257 |
| Description | TRI-STATE Quad 2-Data Selectors/Multiplexers |
| Info | 54LS257A DM54LS257B DM74LS257B 54LS258A DM54LS258B. |
| Manufacture | National Semiconductor |
| for PC | Download DM74LS257 Datasheet |
| Part Number | DM74LS257B |
| Description | TRI-STATE Quad 2-Data Selectors/Multiplexers |
| Info | Obsolete 54LS257A DM54LS257B DM74LS257B 54LS258A . |
| Manufacture | National Semiconductor |
| for PC | Download DM74LS257B Datasheet |
| Part Number | DM74LS257B |
| Description | 3-STATE Quad 2-Data Selectors/Multiplexers |
| Info | DM74LS257B 3-STATE Quad 2-Data Selectors/Multiplex. |
| Manufacture | Fairchild Semiconductor |
| for PC | Download DM74LS257B Datasheet |