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XR16L784 fiches techniques PDF

Exar Corporation - HIGH PERFORMANCE 2.97V TO 5.5V QUAD UART

Numéro de référence XR16L784
Description HIGH PERFORMANCE 2.97V TO 5.5V QUAD UART
Fabricant Exar Corporation 
Logo Exar Corporation 





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XR16L784
HIGH PERFORMANCE 2.97V TO 5.5V QUAD UART
JUNE 2004
GENERAL DESCRIPTION
FEATURES
REV. 1.2.0
The XR16L7841 (784) is a quad Universal
Asynchronous Receiver and Transmitter (UART). The
device is designed for high bandwidth requirement in
communication 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, fully programmable transmit and
receive FIFO level triggers, transmit and receive
FIFO level counters, automatic RTS/CTS or DTR/
DSR hardware flow control with programmable
hysteresis, automatic software (Xon/Xoff) flow
control, IrDA (Infrared Data Association) encoder/
decoder, and a 16-bit general purpose timer/counter.
NOTE: 1 Covered by U.S. Patents #5,649,122 and #5,949,787
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
2.97V to 5.5V 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
Each UART is Independently Controlled with:
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 with
16 Selectable Turn-around Delay
Infrared (IrDA 1.1) Data Encoder/Decoder
Programmable Data Rate with Prescaler
Up to 3.12 (16x) and 6.25 (8x) Mbps Data Rate
A General Purpose 16-bit Timer/Counter
Sleep Mode with Automatic Wake-up Indicator
64-pin TQFP Package (10x10x1.4 mm)
FIGURE 1. BLOCK DIAGRAM
A7:A0
D7:D0
IOR#
IOW#
CS#
INT#
16/68#
RST#
ENIR
Intel or
Motorola
Data
Bus
Interface
Device
Configuration
Register
s
16-bit
Timer/Counter
*All Inputs are 5V Tolerant
(Except XTAL1)
UART Channel 0
UART
Regs
BRG
64 Byte TX FIFO
TX &
RX
IR
ENDEC
64 Byte RX FIFO
UART Channel 1
UART Channel 2
UART Channel 3
Crystal Osc/
Buffer
2.97V to 5.5V VCC
GND
TX0, RX0, DTR0#,
DSR0#, RTS0#,
CTS0#, CD0#, RI0#
TX3, RX3, DTR3#,
DSR3#, RTS3#,
CTS3#, CD3#, RI3#
XTAL1
XTAL2
TMRCK
784BLK
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com

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