This datasheet provides detailed information about the XR16M6811 (M681), an enhanced Universal Asynchronous Receiver and Transmitter (UART) with a VLIO bus interface and 32 bytes of transmit and receive FIFOs, programmable transmit and receive FIFO trigger levels, automatic hardware and software flow control, and data rates of up to 20 Mbps at 3.3V, 16 Mbps at 2.5V and 10 Mbps at 1.8V with 4X data sampling rate.
The XR16M681 UART from Exar provides a high‑performance single‑channel serial interface with a VLIO bus, 32‑byte transmit and receive FIFOs, and flexible flow‑control options. It operates from 1.62 V to 3.63 V and supports data rates up to 20 Mbps.
The device is offered in 24‑pin QFN, 32‑pin QFN and 25‑pin BGA packages, works with RS‑232, RS‑485, RS‑422 and IrDA transceivers, and includes features such as independent TX/RX baud‑rate generators, auto RS‑485 half‑duplex direction control, and power‑save modes.
| Supply Voltage | 1.62 V to 3.63 V |
|---|---|
| Maximum Data Rate | 20 Mbps at 3.3 V |
| Package Options | 24‑pin QFN, 32‑pin QFN, 25‑pin BGA |
| Operating Temperature | -40 °C to +85 °C |
| Interface Type | VLIO 8‑bit multiplexed address/data bus |
| Flow Control | Auto RTS/CTS hardware and Auto XON/XOFF software |
| IrDA Support | Infrared (IrDA 1.0 and 1.1) mode |
The XR16M681 can operate at up to 20 Mbps when supplied at 3.3 V.
It works from 1.62 V to 3.63 V.
The device is offered in 24‑pin QFN, 32‑pin QFN and 25‑pin BGA packages.