| 54ACTQ543 | National Semiconductor | Quiet Series Octal Registered Transceiver with TRI-STATE Outputs |
| 54ACTQ543LMQB | National Semiconductor | Quiet Series Octal Registered Transceiver with TRI-STATE Outputs |
| 54ACTQ543SDMQB | National Semiconductor | Quiet Series Octal Registered Transceiver with TRI-STATE Outputs |
| 54ACTQ543FMQB | National Semiconductor | Quiet Series Octal Registered Transceiver with TRI-STATE Outputs |