XR88C681CP/40-F

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The XR88C681CP/40-F is an integrated Universal Asynchronous Receiver Transmitter (UART) from Exar\'s StarFabric family of communication products. It is a full-featured UART with 16 channels, a continual data rate of 1 Mbit/s, a reduced standby power consumption of 1 mW, and low-profile 48-pin QFP packages. The XR88C681CP/40-F is designed to offer flexibility and features for applications in Ethernet, Serial ATA, SSI, SCC, Chrontel Digital Output, and I2C links.

The XR88C681CP/40-F has a two-tiered configuration with eight single-data-lanes and eight multi-data-lanes (2 x 4). Each of the single-data-lanes consists of a programmable transmitter, a programmable receiver, a 16-byte FIFO, programmable FIFO interrupt alerts, flow control, and a programmable baud rate divider. The multi-data-lanes consists of 16-byte FIFOs, programmable FIFO interrupt alerts, and programmable baud rate dividers. The 16 channels which are available allow for a high degree of flexibility in connecting the chip to different types of peripherals.

The working principle of the XR88C681CP/40-F is relatively straightforward. When transmitting data, the processor sends a byte of data to the XR88C681CP/40-F via the transmit FIFO. The XR88C681CP/40-F will then use the baud rate divider to divide the incoming byte rate into the appropriate baud rate, which can be set by the processor. The XR88C681CP/40-F will then serialize the data, and send it out via the TX line. Once the data has been completely sent, the XR88C681CP/40-F will generate a transmit complete interrupt to the processor.

When receiving data, the XR88C681CP/40-F uses the baud rate divider to separate the incoming data into individual bytes. The XR88C681CP/40-F will then store the bytes into its receive FIFO, and generates a receive complete interrupt to the processor. The processor can then read the data from the receive FIFO. The XR88C681CP/40-F also supports various modes of data flow control, such as XOFF, XON, or RTS/CTS.

The XR88C681CP/40-F has a wide range of applications, ranging from networking and communications to industrial, medical, and consumer applications. In networking, it can be used in Ethernet, Serial ATA, and SSI links. In communications, it can be used in Chrontel Digital Output and I2C links. Additionally, it can be used for serial communication between PCs and peripheral devices, such as displays, cameras, and storage drives. In the industrial and medical fields, it is used in a variety of applications, such as access control, printers, motors, and medical instruments. Finally, in the consumer market, it is used for a variety of devices, such as digital TVs, gaming consoles, and automotive infotainment systems.

In conclusion, the XR88C681CP/40-F is a versatile and powerful UART that is suitable for a variety of applications. With its low-profile QFP package, low-power consumption, and flexibility, it is an ideal choice for any application that requires a UART.

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