XR16L580
SMALLEST 2.25V TO 5.5V UART WITH 16-BYTE FIFO AND POWERSAVE
MAY 2007
REV. 1.4.1
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 very small 32-QFN, 28-QFN and 24-QFN packages in
industrial temperature range.
FEATURES
•
Smallest Full Featured UART
•
2.25V to 5.5V Supply Voltage
•
5V Tolerant Inputs (except XTAL1)
•
Intel/Motorola Bus Select
•
’0 ns’ Address Hold Time (T
AH
and T
ADH
)
•
Pin and Software Compatible to industry
16C450, 16C550, ST16C580,
XR16C850 in the 48-TQFP package.
standard
ST16C650A 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 packages: 24-QFN (4x4x0.9mm),
(5x5x0.9mm) and 32-QFN (5x5x0.9mm)
28-QFN
•
Compatible to standard 48-TQFP packages, without the
following 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
(Except for XTAL1)
UART
UART
Regs
16 Byte TX FIFO
IR
TX & RX ENDEC
16 Byte RX FIFO
VCC
(2.25 to 5.5 V)
GND
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 ]
