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Exar Corporation

XR16M2751 Datasheet Preview

XR16M2751 Datasheet

HIGH PERFORMANCE DUART

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PRELIMINARY
XR16M2751
HIGH PERFORMANCE DUART WITH 64-BYTE FIFO AND POWERSAVE
JUNE 2007
P1.0.0
GENERAL DESCRIPTION
The XR16M27511 (M2751) is a high performance
dual universal asynchronous receiver and transmitter
(UART) with 64 byte TX and RX FIFOs. The device
operates from 1.62 to 3.6 volts and is pin-to-pin and
software compatible to Exar’s XR16V2751. The
device includes 2 additional capabilities over the
XR16M2750: Intel and Motorola data bus selection
and a “PowerSave” mode to further reduce sleep
current to a minimum during sleep mode. It supports
the Exar’s enhanced features of programmable FIFO
trigger level and FIFO level counters, automatic
hardware (RTS/CTS) and software flow control,
automatic RS-485 half duplex direction control output
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 8 Mbps at 3.3 Volt and 8X sampling
clock. The M2751 is available in a 48-pin TQFP
package.
NOTE: 1 Covered by U.S. Patent #5,649,122 and #5,949,787
APPLICATIONS
Portable Appliances
Telecommunication Network Routers
Ethernet Network Routers
Cellular Data Devices
Factory Automation and Process Controls
FEATURES
1.62 to 3.6 Volt Operation
Pin-to-pin compatible to Exar’s XR16V2751 in the
48-TQFP package
Two independent UART channels
Register set identical to 16V2751
Data rate of up to 8 Mbps at 3.3 V, and 6.25
Mbps at 2.5 V and 4 Mbps at 1.8 V with 8X
sampling rate
Fractional Baud Rate Generator
Transmit and Receive FIFOs of 64 bytes
Programmable TX and RX FIFO Trigger Levels
Transmit and Receive FIFO Level Counters
Automatic Hardware (RTS/CTS) Flow Control
Selectable Auto RTS Flow Control Hysteresis
Automatic Software (Xon/Xoff) Flow Control
Automatic RS-485 Half-duplex Direction
Control Output via RTS#
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 32MHz) or external clock
(up to 64MHz) input
48-TQFP package
FIGURE 1. XR16M2751 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
HDCNTL#
Intel or
Motorola
Data Bus
Interface
UART Channel A
UART
Regs
BRG
64 Byte TX FIFO
TX & RX
IR
ENDEC
64 Byte RX FIFO
UART Channel B
(same as Channel A)
Crystal Osc/Buffer
1.62 to 3.6V 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

XR16M2751 Datasheet Preview

XR16M2751 Datasheet

HIGH PERFORMANCE DUART

No Preview Available !

www.DXaRta1S6hMee2t47U5.1com
PRELIMINARY
HIGH PERFORMANCE DUART WITH 64-BYTE FIFO AND POWERSAVE FEATURE
FIGURE 2. PIN OUT ASSIGNMENT
P1.0.0
D5 1
D6 2
D7 3
RXB 4
RXA 5
TXRDYB# 6
TXA 7
TXB 8
OP2B# 9
CSA# 10
CSB# 11
PWRSAVE 12
XR16M2751
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
VCC
D5 1
D6 2
D7 3
RXB 4
RXA 5
TXRDYB# 6
TXA 7
TXB 8
OP2B# 9
CS# 10
A3 11
PWRSAVE 12
XR16M2751
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
GND
ORDERING INFORMATION
PART NUMBER
XR16M2751IM48
PACKAGE
48-Lead TQFP
OPERATING TEMPERATURE RANGE
-40°C to +85°C
DEVICE STATUS
Active
2


Part Number XR16M2751
Description HIGH PERFORMANCE DUART
Maker Exar Corporation
Total Page 30 Pages
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