| Manufacturer | Part # | Datasheet | Description |
 National Semiconductor ... | 54AC258DMQB |  17Kb/7P | Quad 2 Input Multiplexer With TRI - STATE Outputs |
 National Semiconductor ... | 54AC258D |  143Kb/8P | Quad 2-Input Multiplexer with TRI-STATE Outputs |
| 54AC258F |  143Kb/8P | Quad 2-Input Multiplexer with TRI-STATE Outputs |
| 54AC258FMQB |  17Kb/7P | Quad 2 Input Multiplexer With TRI - STATE Outputs |
| 54AC258L |  143Kb/8P | Quad 2-Input Multiplexer with TRI-STATE Outputs |
| 54AC258LMQB |  17Kb/7P | Quad 2 Input Multiplexer With TRI - STATE Outputs |
| 54AC251 |  158Kb/10P | 8-Input Multiplexer with TRI-STATE Output |
| 54AC251 |  33Kb/7P | 8-Input Multiplexer With TRI-STATE Outputs |
 National Semiconductor ... | 54AC251D |  158Kb/10P | 8-Input Multiplexer with TRI-STATE Output |
| 54AC251DMQB |  33Kb/7P | 8-Input Multiplexer With TRI-STATE Outputs |
| 54AC251F |  158Kb/10P | 8-Input Multiplexer with TRI-STATE Output |
| 54AC251FMQB |  33Kb/7P | 8-Input Multiplexer With TRI-STATE Outputs |
| 54AC251L |  158Kb/10P | 8-Input Multiplexer with TRI-STATE Output |
| 54AC251LMQB |  33Kb/7P | 8-Input Multiplexer With TRI-STATE Outputs |
| 54AC253 |  153Kb/8P | Dual 4-Input Multiplexer with TRI-STATE Outputs |
 National Semiconductor ... | 54AC253D |  153Kb/8P | Dual 4-Input Multiplexer with TRI-STATE Outputs |
| 54AC253F |  153Kb/8P | Dual 4-Input Multiplexer with TRI-STATE Outputs |
| 54AC253L |  153Kb/8P | Dual 4-Input Multiplexer with TRI-STATE Outputs |