XR16L784 Exar Corporation, XR16L784 Datasheet
XR16L784
Manufacturer Part Number
XR16L784
Description
High Performance 5V And 3.3V Quad Uart
Manufacturer
Exar Corporation
Datasheet
1.XR16L784.pdf
(43 pages)
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DECEMBER 2001
GENERAL DESCRIPTION
The XR16L784
nous Receiver and Transmitter (UART). The device is
designed for high bandwidth requirement in commu-
nication systems. The global interrupt source register
provides a complete interrupt status indication for all
4 channels to speed up interrupt parsing. Each UART
has its own 16C550 compatible set of configuration
registers, transmit and receive FIFOs of 64 bytes, ful-
ly programmable transmit and receive FIFO level trig-
gers, transmit and receive FIFO level counters, auto-
matic RTS/CTS or DTR/DSR hardware flow control
with programmable hysteresis, automatic software
(Xon/Xoff) flow control, IrDA (Infrared Data Associa-
tion) encoder/decoder, and a 16-bit general purpose
timer/counter.
N
APPLICATIONS
• Remote Access Servers
• Ethernet Network to Serial Ports
• Network Management
• Factory Automation and Process Control
• Point-of-Sale Systems
• Multi-port RS-232/RS-422/RS-485 Cards
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com • uarttechsupport@exar.com
F
OTE
IGURE
16/68#
RST#
ENIR
:
A7:A0
D7:D0
IOR#
IOW#
CS#
INT#
1 Covered by U.S. Patents #5,649,122 and #5,832,205
1. B
LOCK
1
(784) is a quad Universal Asynchro-
D
Data Bus
Motorola
Interface
Intel or
IAGRAM
Configuration
Timer/Counter
Registers
Device
16-bit
HIGH PERFORMANCE 5V AND 3.3V QUAD UART
NEW FEATURES
•
•
•
•
•
• Each UART is Independently Controlled with:
• A General Purpose 16-bit Timer/Counter
• Sleep Mode with Automatic Wake-up Indicator
• 64-pin TQFP Package (10x10x1.4 mm)
*All Inputs are 5V Tolerant
5V and 3.3V Operation with 5V Tolerant Inputs
8-bit Intel or Motorola Data Bus Interface
Single Open Drain Interrupt output for all 4 channels
Global Interrupt Source Registers for all channels
5G (Fifth Generation) “Flat” Register Set
• 16C550 Compatible Registers
• 64-byte Transmit and Receive FIFOs
• Transmit and Receive FIFO Level Counters
• Programmable TX and RX FIFO Trigger Levels
• Automatic RTS/CTS or DTR/DSR Flow Control
• Selectable RTS Flow Control Hysteresis
• Automatic Xon/Xoff Software Flow Control
• Automatic RS485 Half-duplex Control Output
• Infrared (IrDA 1.1) Data Encoder/Decoder
• Programmable Data Rate with Prescaler
• Up to 3.12 (16x) and 6.25 (8x) Mbps Data Rate
with 16 Selectable Turn-around Delay
UART
Regs
BRG
UART Channel 1
UART Channel 2
UART Channel 3
UART Channel 0
Crystal Osc/Buffer
TX &
64 Byte RX FIFO
64 Byte TX FIFO
RX
ENDEC
IR
XR16L784
TX0, RX0, DTR0#,
DSR0#, RTS0#,
CTS0#, CD0#, RI0#
TX3, RX3, DTR3#,
DSR3#, RTS3#,
CTS3#, CD3#, RI3#
XTAL1
XTAL2
TMRCK
5V or 3.3V VCC
GND
784BLK
REV.1.0.2
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