GENERAL DESCRIPTION
The XR16C28521 (2852) is a dual universal asynchronous receiver and transmitter (UART). The device operates at 2.97V to 5.5V and is pin-to-pin compatible to Exar’s ST16C2552 and XR16L2752. The 2852 register set is compatible to the ST16C2552 and the XR16L2752 enhanced features.

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 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
• Alternate Function Register
• Device Identification and Revision
• Crystal oscillator or external clock input
• 2.97 to 5.5 volt operation
• Industrial and commercial temperature ranges

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