The F81504 is a fully‐integrated, single‐lane PCI Express end‐point controller with four high performance UARTs, each of which has a full modem interface and includes the advanced features such as hardware‐accelerated out‐of‐band and in‐band flow control, and readable FIFO levels. The device achieves the outstanding performance by combining the class‐leading 1.5 Mbps asynchronous data rates and 128‐byte transmit and receive FIFOs. It is fully compliant with PCI express base spec. 1.1. The device also supports 16 pins user‐defined GPIOs (Multi with UART 3 & UART 4) and watchdog function.

The two wire signal bus EEPROM interface is provided for the system implementation convenience. Some registers can be pre-programmed via hardware pin settings to facilitate system initialization. The F81504 is fully software compatible with device drivers for Windows & Linux and can be configured to fit the requirements of RS232 and RS485 applications. The device is idea choice for Remote Access Servers, Automation, Process Control, Instrumentation, POS, ATM and Multi-port RS232/RS485 add-in Cards.

It is specifically designed to meet the latest system requirements of high performance, lead (Pb) -free and reduced package size. The device is in the green package of 64-pin TQFP (7mm * 7mm) .