XR16C872 Datasheet, PDF (1/60 Pages) Exar Corporation – DUAL UART WITH 1284 PARALLEL PORT AND PLUG-AND-PLAY CONTROLLER

DISCONTINUED
XR16C872
DUAL UART WITH 1284 PARALLEL PORT
AND PLUG-AND-PLAY CONTROLLER
DESCRIPTION
August 2003
The XR16C872¹ (872) is a dual universal asynchronous receiver and transmitter (UART) with a 1284 bi-directional
parallel port and ISA Bus Plug-and-Play (PnP) interface. The PnP interface supports auto configuration 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 specification 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 features of 128 bytes of transmit and receive FIFOs,
programmable transmit and receive FIFO trigger levels, 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, receive 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 temperature ranges. The chip is fabricated in an advanced
CMOS process to reduce power consumption.
FEATURES
• Plug and Play ISA Bus Specification Compliant
- Auto Configuration
- Direct Connection, Needing no External Buffers
- Resource Data in External 4K EEPROM
- Support 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
APPLICATIONS
• Multi-function PC/ISA Bus Card with RS-232/
RS-422/RS-485 Interface and Printer/parallel Port
• Embedded Systems
• Dual UART Software Compatible with 16C550
• 128-byte of Transmit and Receive FIFOs to
Reduce CPU Bandwidth Requirement
• FIFO Counters in Transmitter and Receiver
• Automatic RTS/CTS Flow Control with Hysteresis
to Increase Data Throughput
• 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 Drivers Available
• Portable Infrared Wireless Systems
• High Speed Bidirectional Parallel Port
• High Speed Serial Ports
ORDERING INFORMATION
Part number
XR16C872CQ
XR16C872IQ
Package
100-Lead QFP
100-Lead QFP
Operating temperature
0° C to + 70° C
-40° C to + 85° C
Device Status
Discontinued. No replacement available.
Discontinued. No replacement available.
1_{Covered by U.S. patent number 5,649,122 and patent pending.}
2_{Windows is a trademark of Microsoft Corp.}
Rev. 1.00
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