| Manufacturer | Part # | Datasheet | Description |
 National Semiconductor ... | 74F258APC |  159Kb/8P | Quad 2-Input Multiplexer with TRI-STATE Outputs |
 National Semiconductor ... | 74F258ASC |  159Kb/8P | Quad 2-Input Multiplexer with TRI-STATE Outputs |
 National Semiconductor ... | 74F258ASJ |  159Kb/8P | Quad 2-Input Multiplexer with TRI-STATE Outputs |
 National Semiconductor ... | 74F258APC |  159Kb/ 8P | Quad 2-Input Multiplexer with TRI-STATE Outputs |
 National Semiconductor ... | 74F258ASC |  159Kb/ 8P | Quad 2-Input Multiplexer with TRI-STATE Outputs |
 National Semiconductor ... | 74F258ASJ |  159Kb/ 8P | Quad 2-Input Multiplexer with TRI-STATE Outputs |
 National Semiconductor ... | 74F251APC |  165Kb/ 8P | 8-Input Multiplexer with TRI-STATE Outputs |
| 74F251ASC |  165Kb/ 8P | 8-Input Multiplexer with TRI-STATE Outputs |
 National Semiconductor ... | 74F251ASJ |  165Kb/ 8P | 8-Input Multiplexer with TRI-STATE Outputs |