GENERAL DESCRIPTION
The XR16C28521 (2852) is a dual universal asynchronous receiver and transmitter (UART). The device operates at 3.3V and 5V and is pin-to-pin compatible to Exar’s ST16C2552 and XR16L2752. The 2852 register set is compatible to the ST16C2552 and the XR16C2752 enhanced features.

FEATURES
• Pin-to-pin compatible to Exar’s ST16C2552 and XR16L2752
• Improved version of PC16C552
• Two independent UART channels
    • Register set compatible to 16C550
    • Up to 3 Mbps at 5V, and 2 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
    • Automatic RS-485 Half-duplex Direction Control Output
    • Wireless Infrared (IrDA 1.0) Encoder/Decoder
    • Automatic sleep mode
    • Full modem interface
• Alternate Function Register
• Device Identification and Revision
• Crystal oscillator or external clock input
• 3.3 V or 5 V operation
• Industrial and commercial temperature ranges
• 44-PLCC package

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