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XR16C872

Dual UART with 1284 Parallel Port and Plug-and-Play Controller

Exar Corporation 

Preliminary

XR16C872

Dual UART with 1284 Parallel Port

and Plug-and-Play Controller

FEATURES

• Plug and Play ISA Bus Specification Compliant

- Auto Configuration

- Direct Connection, Needing no External Buffers

- Resource Data in External 4K EEPROM

- 10-Interrupts IRQ3-7, IRQ9-12, IRQ15

• Manual Configuration for Standard COM1-COM-4

and LPT1-LPT2

• IEEE 1284 Compliant

- Bidirectional Host Port

- Level-II Electrical Interface, Needing no

External Transceivers

- Standard Centronics/ECP/EPP Mode

- 16-byte FIFO in ECP mode

• Dual UART Software Compatible with 16C550

• 128-Byte Transmit and Receiver FIFOs Reduce

CPU Interrupt

• FIFO Counters in Transmitter and Receiver

• Automatic RTS/CTS Flow Control with Hysteresis

to Increase Data Throughput

DESCRIPTION

June 1999-1

• IrDA Infrared Pulse Shaping Encoder/Decoder for

up to 115.2Kbps Data Rate

• Up to 460.8 Kbps Standard Serial Data Rate

• +5V and +3.3V Operation

• 100-pin Quad Flat Package (14x20mm)

• Reference PC ISA Card Design Available

• Windows2 95, 98 and NT4.0 Device Drivers are

Available

APPLICATIONS

• Multi-function PC/ISA Bus Card with RS-232/

RS-422/RS-485 Interface and Printer/parallel Port

• Embedded Systems

• Portable Infrared Wireless Systems

• High-speed Bidirectional Parallel Port

• High-speed Serial Ports

The XR16C8721 (872) is a dual universal asynchronous

receiver and transmitter (UART) with a 1284 bi-direc-

tional parallel port and ISA Bus Plug-and-Play (PnP)

interface. The PnP interface supports auto configura-

tion for desktop and embedded PC computers. The

host bus interface can also be configured to manually

support standard PC addresses COM1-4 and LPT1-2.

The parallel port is compatible to IEEE 1284 specifica-

tion and supports Compatible Centronics, Extended

Capability (ECP) and Enhanced Parallel Port (EPP)

protocols. The UARTs are software compatible to

industry standard 16C550 and include enhanced fea-

tures of 128 bytes of transmit and receive FIFOs,

programmable transmit and receive FIFO trigger lev-

els, transmit and receive FIFO counters, IrDA (Infrared

Data Association) encoder/decoder, automatic RTS/

CTS hardware flow control with selectable hysteresis,

and automatic software (Xon/Xoff) flow control. On

board status registers provide interrupt priorities, re-

ceive data errors and modem status. Each channel has

a programmable baud rate generator to provide data

rates up to 460.8Kbps. The bi-directional parallel port

can be configured as a general purpose input/output

interface or connected to a printer or portable storage

devices. The 872 operates on a single +5V and +3.3

power supply. It is available in a small 100-pin QFP

package and offers commercial and industrial tem-

perature ranges. The chip is fabricated in an advanced

CMOS process to reduce power consumption.

ORDERING INFORMATION

Part Number

Package Operating Temperature

XR16C872CQ 100-Lead QFP

0° C to + 70° C

XR16C872IQ 100-Lead QFP

-40° C to + 85° C

Notes:

1 Covered by U.S. patent number 5,649,122 and patent pending.

2 Windows is a trademark of Microsoft Corp.

Rev. P1.00

EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 • (510) 668-7000 • FAX (510) 668-7017 • www@exar.com

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