| 54ACTQ544 | National Semiconductor | Quiet Series Octal Registered Transceiver with TRI-STATE Outputs |
| 54ACTQ544LMQB | National Semiconductor | Quiet Series Octal Registered Transceiver with TRI-STATE Outputs |
| 54ACTQ544SDMQB | National Semiconductor | Quiet Series Octal Registered Transceiver with TRI-STATE Outputs |
| 54ACTQ544FMQB | National Semiconductor | Quiet Series Octal Registered Transceiver with TRI-STATE Outputs |