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