áç
JANUARY 2004
XR16L580
SMALLEST 2.25V TO 5.5V UART WITH 16-BYTE FIFO AND POWERSAVE
REV. 1.2.0
GENERAL DESCRIPTION
The XR16L580 (L580) is a 2.25 to 5.5 volt Universal
Asynchronous Receiver and Transmitter (UART) with
5 volt tolerant inputs and a reduced pin count. It is
pin-to-pin and software compatible to industry
standard 16C450, 16C550, ST16C580, ST16C650A
and XR16C850 UARTs. It has 16 bytes of TX and RX
FIFOs and is capable of operating up to serial data
rate of 1 Mbps at 2.25 volt supply voltage. The
internal registers is compatible to the 16C550
register set plus enhanced registers for additional
features to support today’s high bandwidth data
communication needs. The enhanced features
include Intel or Motorola data bus interface to match
your CPU interface, automatic hardware and
software flow control to prevent data loss, selectable
RX and TX trigger levels for more efficient interrupt
service, wireless infrared (IrDA) encoder/decoder for
wireless applications and a unique Power-Save mode
to increase battery operating time. The device comes
in the 48-TQFP and a very small 32-QFN packages in
industrial temperature range.
FEATURES
•
Industry Smallest Full Featured UART
•
2.25V to 5.5V Operation
•
5V Tolerant Inputs
•
Intel/Motorola Bus Select
•
’0 ns’ Address Hold Time (T
AH
and T
ADH
)
•
Pin and Software Compatible to industry standard
16C450, 16C550, ST16C580, ST16C650A
XR16C850 in the 48-TQFP package.
and
•
16-byte Transmit FIFO
•
16-byte Receive FIFO with Errors Flags
•
Selectable RX and TX FIFO Trigger Levels
•
Automatic Hardware (RTS/CTS) Flow Control
•
Automatic Software (Xon/Xoff) Flow Control
•
Up to 3.125 Mbps Data Rate at 5V and 2 Mbps
at
3.3V and 1 Mbps at 2.25V Operation with External
Clock Input
APPLICATIONS
•
Handheld Terminals and Tablets
•
Handheld Computers
•
Wireless Portable Point-of-Sale Terminals
•
Cellular Phones DataPort
•
GPS Devices
•
Personal Digital Assistants Modules
•
Battery Operated Instruments
F
IGURE
1. B
LOCK
D
IAGRAM
•
Infrared (IrDA) Encoder/Decoder
•
Complete Modem Interface
•
Power-Save Mode to conserve battery power
•
Sleep Mode with Wake-up Interrupt
•
Small 32-QFN (5x5x0.9mm) package
•
Compatible to standard 48-TQFP packages
without the following redundant signals: IOR,
IOW, CS1, CS2, TXRDY#, RXRDY#, RCLK,
BAUDOUT#, OP1# and OP2#
•
Industrial Temperature Grade(-40 to +85
o
C)
PwrSave
A2:A0
D7:D0
IOR#
IOW# (R/W#)
CS#
INT (IRQ#)
RESET
(RESET#)
*5 V Tolerant Inputs
VCC
(2.25 to 5.5 V)
GND
UART
UART
Regs
16 Byte TX FIFO
IR
TX & RX ENDEC
16 Byte RX FIFO
TX, RX,
RTS#, CTS#,
DTR#, DSR#,
RI#, CD#
Intel or
Motorola
Data Bus
Interface
BRG
16/68#
Crystal Osc/Buffer
XTAL1
XTAL2
GNugget_BLK
Exar
Corporation 48720 Kato Road, Fremont CA, 94538
•
(510) 668-7000
•
FAX (510) 668-7017
•
www.exar.com
EXAR [ EXAR CORPORATION ]
