XR16M770 Datasheet, PDF (1/52 Pages) Exar Corporation – 1.62V TO 3.63V HIGH PERFORMANCE UART WITH 64-BYTE FIFO

XR16M770
1.62V TO 3.63V HIGH PERFORMANCE UART WITH 64-BYTE FIFO
FEBRUARY 2009
REV. 1.0.0
GENERAL DESCRIPTION
The XR16M770¹ (M770) is an enhanced Universal
Asynchronous Receiver and Transmitter (UART) with
64 bytes of transmit and receive FIFOs,
programmable 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.
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.
The Independent TX/RX Baud Rate Generator
feature allows the transmitter and receiver to operate
at different baud rates. Power consumption of the
M770 can be minimized by enabling the sleep mode
and PowerSave mode.
The M770 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 M770 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.
NOTE: 1 Covered by U.S. Patent #5,649,122.
FEATURES
• Pin-to-pin compatible with XR16L570 in 24-QFN
and 32-QFN packages
• Intel data bus Interface
• 16 Mbps maximum data rate
• Programmable TX/RX FIFO Trigger Levels
• TX/RX FIFO Level Counters
• 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
• Personal Digital Assistants (PDA)
• Cellular Phones/Data Devices
• Battery-Operated Devices
• Global Positioning System (GPS)
• Bluetooth
FIGURE 1. XR16M770 BLOCK DIAGRAM
Pw rSave
A 2:A 0
D 7:D 0
IO R #
IO W #
CS#
IN T
RESET
In te l
D ata B us
In te rfa c e
UART
UART
Regs
64 B yte TX FIFO
TX &
RX
IR
ENDEC
B R G 64 B yte R X FIFO
C rystal O sc/B uffer
VCC
(1.62 to 3.63 V )
GND
TX, RX,
RTS#, CTS#,
DTR#, DSR#,
R I#, C D #
XTAL1
XTAL2
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • [phone] • FAX [phone] • www.exar.com