XR16L580_07 Datasheet, PDF (1/52 Pages) Exar Corporation – SMALLEST 2.25V TO 5.5V UART WITH 16-BYTE FIFO AND POWERSAVE

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.
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
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 standard
16C450, 16C550, ST16C580, ST16C650A and
XR16C850 in the 48-TQFP package.
• 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
• 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), 28-QFN
(5x5x0.9mm) and 32-QFN (5x5x0.9mm)
• 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^oC)
FIGURE 1. BLOCK DIAGRAM
PwrSave
A2:A0
D7:D0
IOR#
IOW# (R/W#)
CS#
INT (IRQ#)
RESET
(RESET#)
16/68#
Intel or
Motorola
Data Bus
Interface
*5 V Tolerant Inputs
(Except for XTAL1)
UART
UART ^{16 Byte TX FIFO}
Regs
TX
&
RX
IR
ENDEC
BRG 16 Byte RX FIFO
Crystal Osc/Buffer
VCC
(2.25 to 5.5 V)
GND
TX, RX,
RTS#, CTS#,
DTR#, DSR#,
RI#, CD#
XTAL1
XTAL2
GNugget_BLK
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • [phone] • FAX [phone] • www.exar.com