XR16V2550 Datasheet, PDF (1/48 Pages) Exar Corporation – HIGH PERFORMANCE DUART WITH 16-BYTE FIFO

PRELIMINARY
XR16V2550
HIGH PERFORMANCE DUART WITH 16-BYTE FIFO
JUNE 2006
REV. P1.0.0
GENERAL DESCRIPTION
The XR16V2550¹ (V2550) is a high performance dual
universal asynchronous receiver and transmitter
(UART) with 16 bytes TX and RX FIFOs. The device
operates from 2.25 to 3.6 volts with 5 Volt tolerant
inputs and is pin-to-pin compatible to Exar’s
ST16C2550 and XR16C2550. The V2550 register set
is compatible to the ST16C2550 and the XR16L2550.
It supports Exar’s enhanced features of selectable
FIFO trigger level, automatic hardware (RTS/CTS)
and software flow control, and a complete modem
interface. Onboard registers provide the user with
operational status and data error flags. An internal
loopback capability allows system diagnostics.
Independent programmable baud rate generators are
provided in each channel to select data rates up to 16
Mbps at 3.3 Volt with 4X sampling clock. The V2550
is available in 48-pin TQFP and 32-pin QFN
packages.
NOTE: 1 Covered by U.S. Patent #5,649,122
APPLICATIONS
• Portable Appliances
• Telecommunication Network Routers
• Ethernet Network Routers
• Cellular Data Devices
• Factory Automation and Process Controls
FEATURES
• 2.25 to 3.6 Volt Operation
• 5 Volt Tolerant Inputs
• Pin-to-pin compatible to ST16C2550, XR16C2550
and XR16L2550 in the 48-TQFP package
• Two independent UART channels
■ Register set compatible to XR16L2550
■ Data rate of up to 16 Mbps at 3.3 V, and 12.5
Mbps at 2.5 V with 4X sampling rate
■ Fractional Baud Rate Generator
■ Transmit and Receive FIFOs of 16 bytes
■ Selectable TX and RX FIFO Trigger Levels
■ Automatic Hardware (RTS/CTS) Flow Control
■ Automatic Software (Xon/Xoff) Flow Control
■ Wireless Infrared (IrDA 1.0) Encoder/Decoder
■ Automatic sleep mode
■ Full modem interface
• Device Identification and Revision
• Crystal oscillator (up to 32MHz) or external clock
(up to 64MHz) input
• 48-TQFP and 32-QFN packages
FIGURE 1. XR16V2550 BLOCK DIAGRAM
A2:A0
D7:D0
IOR#
IOW#
CSA#
CSB#
INTA
INTB
TXRDYA#
TXRDYB#
RXRDYA#
RXRDYB#
Reset
8-bit Data
Bus
Interface
* 5 Volt Tolerant Inputs
UART Channel A
UART
Regs
BRG
16 Byte TX FIFO
TX & RX
IR
ENDEC
16 Byte RX FIFO
UART Channel B
(same as Channel A)
Crystal Osc/Buffer
2.25 to 3.6 Volt VCC
GND
TXA, RXA, DTRA#,
DSRA#, RTSA#,
DTSA#, CDA#, RIA#,
OP2A#
TXB, RXB, DTRB#,
DSRB#, RTSB#,
CTSB#, CDB#, RIB#,
OP2B#
XTAL1
XTAL2
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • [phone] • FAX [phone] • www.exar.com