GENERAL DESCRIPTION
   The XR16C28501 (2850) is an enhanced dual universal asynchronous receiver and transmitter (UART). Enhanced features include 128 bytes of TX and RX FIFOs, programmable TX and RX FIFO trigger level, FIFO level counters, automatic (RTS/ CTS) hardware and (Xon/Xoff) software flow control, automatic RS-485 half duplex direction control output and data rates up to 6.25 Mbps at 5V and 8X sampling clock. Onboard status registers provide the user with operational status and data error flags. An internal loopback capability allows system diagnostics. 

FEATURES
Added feature in devices with a top mark date code of
"F2 YYWW" and newer:
   ■ 5V tolerant inputs
   ■ 0 ns address hold time (TAH)
● Pin-to-pin compatible and functionally compatible to
   Exar’s ST16C2550 and XR16L2750 and TI’s
   TL16C752B in the 48-TQFP package
● Pin-alike Exar’s XR16L2750 and ST16C2550 48-
   TQFP package but with additional CLK8/16,
   CLKSEL and HDCNTL inputs
● Two independent UART channels
   ■ Register set compatible to 16C550
   ■ Up to 6.25 Mbps at 5V, and 4 Mbps at 3.3V
   ■ Transmit and Receive FIFOs of 128 bytes
   ■ Programmable TX and RX FIFO Trigger Levels
   ■ Transmit and Receive FIFO Level Counters
   ■ Automatic Hardware (RTS/CTS) Flow Control
   ■ Selectable Auto RTS Flow Control Hysteresis
   ■ Automatic Software (Xon/Xoff) Flow Control
   ■ Auto RS-485 Half-duplex Direction Control
   ■ Wireless Infrared (IrDA 1.0) Encoder/Decoder
   ■ Full modem interface
● Device Identification and Revision
● Crystal oscillator or external clock input
● Industrial and commercial temperature ranges
● 48-TQFP and 44-PLCC packages

APPLICATIONS
● Portable Appliances
● Telecommunication Network Routers
● Ethernet Network Routers
● Cellular Data Devices
● Factory Automation and Process Controls