| XR82C684 | Exar | Quad UART with Four Fully Independent Full-Duplex Asynchronous Communication Channels |
| XR88C192 | Exar | Dual UART with 16 Bytes Transmit and Receive FIFO |
| XR88C681 | Exar | Dual UART CMOS with Two Fully Independent Full Duplex Asynchronous Communications Channels |
| XR88C92 | Exar | Dual UART with 8 Bytes Transmit and Receive FIFO |