XR16L788 Exar Corporation, XR16L788 Datasheet

XR16L788

Manufacturer Part Number

XR16L788

Description

High-performance 3.3V Octal Uart

Manufacturer

Exar Corporation

Datasheet

1.XR16L788.pdf (42 pages)

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SEPTEMBER 2001

GENERAL DESCRIPTION

The XR16L788

and 3.3V with 5V tolerant inputs octal Universal Asyn-

chronous Receiver and Transmitter (UART). The

highly integrated device is designed for high band-

width requirement in communication systems. A new

feature increases device driver efficiency includes a

global interrupt pin with global interrupt source regis-

ters that provide complete and detailed interrupt sta-

tus information for all 8 channels that will speed up in-

terrupt parsing. Other new facilities include simulta-

neous UART registers initialization, individual UART

channel soft-reset, DTR/DSR hardware flow control,

software flow control (Xoff/Xon) detection indicators,

RS-485 half-duplex direction control with programma-

ble turn-around delay, Intel or Motorola bus interface

and sleep mode now has a wake-up indicator.

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

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OTE

IGURE

R S T #

A 7:A 0

D 7 :D 0

IO R #

IO W #

C S #

IN T #

1 6/6 8#

Covered by US patents #5,649,122 and #5,949,787

1. B

LOCK

(788), formerly XR16L758, is a 5V

D a ta B u s

Inte rfa ce

IAGRAM

T im e r/C o un ter

C o n figu ra tio n

R e g isters

D e vice

1 6-bit

HIGH PERFORMANCE OCTAL UART

NEW FEATURES:

• 5V and 3.3 V with 5V Tolerant Inputs Operation

• Single Interrupt Output for all 8 UARTs

• Global Interrupt Source for all 8 UARTs

• 5G “Flat” UART Registers for Configurations

• Simultaneous UART Channels Initialization

• Auto RS485 Half-duplex Control with Program-

• A General Purpose 16-bit Timer/Counter

• Sleep Mode with Wake-up Indication

• Highly Integrated Device for Space Saving

• First eight registers are 16C550 compatible

• 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 Hardware Flow Control Hysteresis

• Automatic Xon/Xoff Software Flow Control with Sta-

• Infrared (IrDA 1.0) Data Encoder/Decoder

• Programmable Data Rate with Prescaler

• Up to 6.25 Mbps Serial Data Rate at 5V

• 100-pin QFP Package (14x20x3 mm)

mable Turn-around Delay

tus Indicator

U A R T

R eg s

B R G

U A R T C ha n ne l 1

U A R T C ha n ne l 2

U A R T C ha n ne l 3

U A R T C ha n ne l 4

U A R T C ha n ne l 5

U A R T C ha n ne l 0

U A R T C ha n ne l 6

U A R T C ha n ne l 7

C rystal O sc/B u ffer

T X & R X

64 B yte T X FIF O

64 B yte R X F IF O

E N D E C

XR16L788

T X 0 , R X 0 , D T R 0# ,

D S R 0# , R T S 0# ,

C T S 0 # , C D 0 #, R I0 #

X T A L1

X T A L2

T M R C K

T X 7 , R X 7 , D T R 7# ,

D S R 7# , R T S 7# ,

C T S 7 # , C D 7 #, R I7 #

REV. 1.1.4

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