| 制造商 | 部件名 | 数据表 | 功能描述 |
 National Semiconductor ... | PC16552C |  827Kb/22P | Dual Universal Asynchronous Receiver/Transmitter with FIFOs |
| PC16552CV |  827Kb/22P | Dual Universal Asynchronous Receiver/Transmitter with FIFOs |
 National Semiconductor ... | PC16552CV |  827Kb/ 22P | Dual Universal Asynchronous Receiver/Transmitter with FIFOs |
 National Semiconductor ... | PC16552D |  291Kb/ 21P | Dual Universal Asynchronous Receiver/Transmitter with FIFOs |
| PC16552DV |  291Kb/ 21P | Dual Universal Asynchronous Receiver/Transmitter with FIFOs |
 National Semiconductor ... | PC16550D |  344Kb/ 22P | PC16550D Universal Asynchronous Receiver/Transmitter with FIFOs |
 National Semiconductor ... | PC16550DN |  344Kb/ 22P | PC16550D Universal Asynchronous Receiver/Transmitter with FIFOs |
 National Semiconductor ... | PC16550DV |  344Kb/ 22P | PC16550D Universal Asynchronous Receiver/Transmitter with FIFOs |
 National Semiconductor ... | PC16550DVEF |  344Kb/ 22P | PC16550D Universal Asynchronous Receiver/Transmitter with FIFOs |
 National Semiconductor ... | PC16550DVX |  84Kb/ 3P | Engineering Project Manager |