XR16L788IQ-F Datasheet, PDF (1/54 Pages) Exar Corporation – HIGH PERFORMANCE 2.97V TO 5.5V OCTAL UART

XR16L788
HIGH PERFORMANCE 2.97V TO 5.5V OCTAL UART
JULY 2008
REV. 1.2.3
GENERAL DESCRIPTION
The XR16L7881 (788), is a 2.97V to 5.5V with 5V
tolerant inputs octal Universal Asynchronous
Receiver and Transmitter (UART). The highly
integrated device is designed for high bandwidth
requirement in communication systems. The global
interrupt source register provides a complete interrupt
status indication for all 8 channels to speed up
interrupt parsing. Each UART has its own 16C550
compatible set of configuration registers, TX and RX
FIFOs of 64 bytes, fully programmable transmit and
receive FIFO trigger levels, TX and RX FIFO level
counters, automatic RTS/CTS or DTR/DSR hardware
flow control with programmable hysteresis, autoamtic
software (Xon/Xoff) flow control, RS-485 half-duplex
direction control with programmable turn-around
delay, Intel or Motorola bus interface and sleep mode
with a wake-up indicator.
NOTE: Covered by US 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
FEATURES
• 2.97V to 5.5V 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-
mable Turn-around Delay
• 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
Status Indicator
• 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)
FIGURE 1. BLOCK DIAGRAM
RST#
A7:A0
D7:D0
IOR#
IOW#
CS#
INT#
16/68#
Data Bus
Interface
Device
Configuration
Registers
16-bit
Timer/Counter
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
UART Channel 4
UART Channel 5
UART Channel 6
UART Channel 7
Crystal Osc/Buffer
TX0, RX0, DTR0#,
DSR0#, RTS0#,
CTS0#, CD0#, RI0#
TX7, RX7, DTR7#,
DSR7#, RTS7#,
CTS7#, CD7#, RI7#
XTAL1
XTAL2
TMRCK
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • [phone] • FAX [phone] • www.exar.com