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Exar Corporation
Exar Corporation

XR16M2551 Datasheet Preview

XR16M2551 Datasheet

HIGH PERFORMANCE LOW VOLTAGE DUART

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XR16M2551 pdf
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MAY 2007
XR16M2551
HIGH PERFORMANCE LOW VOLTAGE DUART WITH 16-BYTE FIFO AND POWERSAVE FEATURE
REV. 1.0.1
GENERAL DESCRIPTION
The XR16M25511 (M2551) is a high performance
dual universal asynchronous receiver and transmitter
(UART) with 16 byte TX and RX FIFOs. The device
operates from 1.62 to 3.63 volts and is pin-to-pin
compatible to the XR16L2551 and XR16V2551. The
M2551 includes 2 additional capabilities over the
XR16M2550: Intel and Motorola data bus selection
and a “PowerSave” mode to minimize the sleep
current. It supports Exar’s enhanced features of
selectable FIFO trigger level, automatic hardware
(RTS/CTS) and software flow control, and a complete
modem interface. An internal loopback capability
allows system diagnostics. Independent
programmable fractional baud rate generators are
provided in each channel to select data rates up to 16
Mbps at 3.3 Volt and 4X sampling clock. The M2551
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 compatible to Exar’s XR16V2551 and the
XR16L2551
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 with wake-up interrupt
Full modem interface
PowerSave Feature reduces sleep current to 15 µA
Device Identification and Revision
Crystal oscillator (up to 24MHz) or external clock
(up to 64MHz) input
48-TQFP and 32-QFN packages
FIGURE 1. XR16M2551 BLOCK DIAGRAM
PwrSave
A2:A0
D7:D0
IOR# (VCC)
IOW# (R/W#)
CSA# (CS#)
CSB# (A3)
INTA (IRQ#)
INTB (logic 0)
TXRDYA#
TXRDYB#
RXRDYA#
RXRDYB#
Reset (Reset#)
16/68#
CLKSEL
Intel or
Motorola
Data Bus
Interface
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
1.62 to 3.63V 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

XR16M2551 Datasheet Preview

XR16M2551 Datasheet

HIGH PERFORMANCE LOW VOLTAGE DUART

No Preview Available !

XR16M2551 pdf
www.DXaRta1S6hMee2t54U5.1com
HIGH PERFORMANCE LOW VOLTAGE DUART WITH 16-BYTE FIFO AND POWERSAVE FEATURE
FIGURE 2. PIN OUT ASSIGNMENT
REV. 1.0.1
D6
D7
RXB
RXA
TXA
TXB
CSA#
CSB#
1
2
3
4
5
6
7
8
XR16M2551
32-pin QFN
In 16 (Intel) Mode
24 RESET
23 RTSA#
22 INTA
21 INTB
20 A0
19 A1
18 A2
VCC
17 16/68#
D6
D7
RXB
RXA
TXA
TXB
CS#
A3 (CSB#)
1
2
3
4
5
6
7
8
XR16M2551
32-pin QFN
in 68 (Motorola) Mode
24 RESET# (Reset)
23 RTSA#
22 IRQ#
21 NC (INTB)
20 A0
19 A1
18 A2
17 16/68#
GND
D5 1
D6 2
D7 3
RXB 4
RXA 5
TXRDYB# 6
TXA 7
TXB 8
OP2B# 9
CSA# 10
CSB# 11
PWRSAVE 12
XR16M2551
48-pin TQFP
in 16 (Intel) Mode
36 RESET
35 DTRB#
34 DTRA#
33 RTSA#
32 OP2A#
31 RXRDYA#
30 INTA
29 INTB
28 A0
27 A1
26 A2
25 CLKSEL
D5 1
D6 2
D7 3
RXB 4
RXA 5
TXRDYB# 6
TXA 7
TXB 8
OP2B# 9
CS# 10
A3 11
PWRSAVE 12
XR16M2551
48-pin TQFP
in 68 (Motorola) Mode
36 RESET#
35 DTRB#
34 DTRA#
33 RTSA#
32 OP2A#
31 RXRDYA#
30 IRQ#
29 NC
28 A0
27 A1
26 A2
25 CLKSEL
VCC
ORDERING INFORMATION
PART NUMBER
XR16M2551IL32
XR16M2551IM48
PACKAGE
32-Pin QFN
48-Lead TQFP
OPERATING TEMPERATURE RANGE
-40°C to +85°C
-40°C to +85°C
GND
DEVICE STATUS
Active
Active
2


Part Number XR16M2551
Description HIGH PERFORMANCE LOW VOLTAGE DUART
Maker Exar Corporation
Total Page 30 Pages
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