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Exar Corporation
Exar Corporation

XR16M2550 Datasheet Preview

XR16M2550 Datasheet

HIGH PERFORMANCE LOW VOLTAGE DUART

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XR16M2550
HIGH PERFORMANCE LOW VOLTAGE DUART WITH 16-BYTE FIFO
MAY 2007
REV. 1.0.1
GENERAL DESCRIPTION
The XR16M25501 (M2550) is a high performance
dual universal asynchronous receiver and transmitter
(UART) with 16 bytes TX and RX FIFOs. The device
operates from 1.62 to 3.63 volts and is pin-to-pin and
software compatible to the ST16C2550, XR16L2550,
and XR16V2550. 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 M2550 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
1.62 to 3.63 Volt Operation
Pin-to-pin and software compatible to ST16C2550
in the 48-TQFP package
Pin-to-pin and software compatible to XR16L2550
and XR16V2550
Two independent UART channels
Register set is 16550 compatible
Data rate of up to 16 Mbps at 3.3 V
Data rate of up to 12.5 Mbps at 2.5 V
Data rate of up to 8 Mbps at 1.8V
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 24MHz) or external clock
(up to 64MHz) input
48-TQFP and 32-QFN packages
FIGURE 1. XR16M2550 BLOCK DIAGRAM
A2:A0
D7:D0
IOR#
IOW#
CSA#
CSB#
INTA
INTB
TXRDYA#
TXRDYB#
RXRDYA#
RXRDYB#
Reset
8-bit Data
Bus
Interface
UART Channel A
UART 16 Byte TX FIFO
Regs
TX & RX
IR
ENDEC
BRG 16 Byte RX FIFO
UART Channel B
(same as Channel A)
Crystal Osc/Buffer
1.62 to 3.63 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 (510) 668-7000 FAX (510) 668-7017 www.exar.com



Exar Corporation
Exar Corporation

XR16M2550 Datasheet Preview

XR16M2550 Datasheet

HIGH PERFORMANCE LOW VOLTAGE DUART

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XR16M2550 pdf
www.DXaRta1S6hMee2t54U5.0com
HIGH PERFORMANCE LOW VOLTAGE DUART WITH 16-BYTE FIFO
FIGURE 2. PIN OUT ASSIGNMENT
D5 1
D6 2
D7 3
RXB 4
RXA 5
TXRDYB# 6
TXA 7
TXB 8
OP2B# 9
CSA# 10
CSB# 11
NC 12
XR16M2550
48-pin TQFP
36 RESET
35 DTRB#
34 DTRA#
33 RTSA#
32 OP2A#
31 RXRDYA#
30 INTA
29 INTB
28 A0
27 A1
26 A2
25 NC
REV. 1.0.1
D6
D7
RXB
RXA
TXA
TXB
CSA#
CSB#
1
2
3
4
5
6
7
8
XR16M2550
32-pin QFN
24 RESET
23 RTSA#
22 INTA
21 INTB
20 A0
19 A1
18 A2
17 NC
ORDERING INFORMATION
PART NUMBER
XR16M2550IL32
XR16M2550IM48
PACKAGE
32-Pin QFN
48-Lead TQFP
OPERATING TEMPERATURE RANGE
-40°C to +85°C
-40°C to +85°C
DEVICE STATUS
Active
Active
2


Part Number XR16M2550
Description HIGH PERFORMANCE LOW VOLTAGE DUART
Maker Exar Corporation
Total Page 30 Pages
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