The V354 is compliant to PCIe 2.0 Gen 1 (2.5GT/s). The V354 serves as a single lane PCIe bridge to 4 independent enhanced 16550 compatible UARTs. 

The XR17V354¹ (V354) is a single chip 4-channel PCI Express (PCIe) UART (Universal Asynchronous Receiver and Transmitter), optimized for higher performance and lower power. 

Each UART of the V354 has many enhanced features such as the 256-bytes TX and RX FIFOs, programmable Fractional Baud Rate Generator, Automatic Hardware or Software Flow Control, 

Auto RS-485 Half-Duplex Direction Control, programmable TX and RX FIFO Trigger Levels, TX and RX FIFO Level Counters, infrared mode, and data rates up to 31.25Mbps. 

In addition to the UART channels, the V358 has 16 multi-purpose I/Os (MPIOs), a 16-bit general purpose counter/timer and a global interrupt status register to optimize interrupt servicing.

Features

● PCIe 2.0 Gen 1 compliant

● x1 Link, dual simplex, 2.5Gbps in each direction

● Expansion bus interface

● EEPROM interface for configuration

● Data read/write burst operation

● Global interrupt status register for all eight UARTs

● RS485 Signal: T+(A), T-(B), GND

● RS422 Signal: T +, T -, R+, R-, GND

● 500W surge protection, 20KV ESD protection for all serial ports

● Working mode: asynchronous working, point-to point or point-to-multipoint 2-wires(half duplex), 4-wires(full duplex)

● Maximum up to 1.2KM transmission distance in RS-485/RS-422 mode (300bps 921600bps)

● Transmission media: twisted-pair cable or shielded cable

● Interface protection: 500W surge protection, 20KV ESD protection for all serial ports 

● UART interface support for 7 or 8 data bits,1 or 2 stop bits and Even/ Odd/ Mark/ Space/ None

● Flow control: None, hardware and Xon / Xoff

● Sleep mode with wake –up indicator

● Load capability: support point-to-multiport transmission, Each converter can connect 32 RS-422 or RS-485 interface equipment

● Operating temperature range: -40 to 85℃