XR16M570
1.62V TO 3.63V HIGH PERFORMANCE UART WITH 16-BYTE FIFO
DECEMBER 2009
REV. 1.0.1
FEATURES
GENERAL DESCRIPTION
• Pin-to-pin compatible with XR16L570 in 24-QFN
1
The XR16M570 (M570) is an enhanced Universal
and 32-QFN packages
Asynchronous Receiver and Transmitter (UART) with
16 bytes of transmit and receive FIFOs, selectable
transmit and receive FIFO trigger levels, automatic
hardware and software flow control, and data rates of
up to 16 Mbps at 3.3V, 12.5 Mbps at 2.5V and 7.5
Mbps at 1.8V with 4X data sampling rate.
• Intel data bus Interface
• 16 Mbps maximum data rate
• Selectable TX/RX FIFO Trigger Levels
• TX/RX FIFO Level Counters
The Auto RS-485 Half-Duplex Direction control
feature simplifies both the hardware and software for
half-duplex RS-485 applications. In addition, the
Multidrop mode with Auto Address detection
increases the performance by simplifying the
software routines.
• Independent TX/RX Baud Rate Generator
• Fractional Baud Rate Generator
• Auto RTS/CTS Hardware Flow Control
• Auto XON/XOFF Software Flow Control
• Auto RS-485 Half-Duplex Direction Control
• Multidrop mode w/ Auto Address Detect
• Sleep Mode with Automatic Wake-up
• PowerSave mode in 24-pin QFN package
• Infrared (IrDA 1.0 and 1.1) mode
• 1.62V to 3.63V supply operation
• Crystal oscillator or external clock input
APPLICATIONS
The Independent TX/RX Baud Rate Generator
feature allows the transmitter and receiver to operate
at different baud rates. Power consumption of the
M570 can be minimized by enabling the sleep mode
and PowerSave mode.
The M570 has a 16550 compatible register set that
provide users with operating status and control,
receiver error indications, and modem serial interface
controls. An internal loopback capability allows
onboard diagnostics. The M570 is available in 24-pin
QFN, 32-pin QFN and 25-pin BGA packages. All
three packages offer the 16 mode (Intel bus) interface
only.
• Personal Digital Assistants (PDA)
• Cellular Phones/Data Devices
• Battery-Operated Devices
NOTE: 1 Covered by U.S. Patent #5,649,122.
• Global Positioning System (GPS)
• Bluetooth
FIGURE 1. XR16M570 BLOCK DIAGRAM
VCC
(1.62 to 3.63 V)
PwrSave
A2:A0
GND
D7:D0
IOR#
UART
TX, RX,
IOW#
CS#
16 Byte TX FIFO
UART
RTS#, CTS#,
DTR#, DSR#,
RI#, CD#
Regs
TX &
RX
IR
ENDEC
INT
Intel
Data Bus
16 Byte RX FIFO
BRG
RESET
Interface
XTAL1
XTAL2
Crystal Osc/Buffer
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com