XR16V2751IM datasheet(1/52 Pages) EXAR

Part #	XR16V2751IM

Description	HIGH PERFORMANCE DUART WITH 64-BYTE FIFO AND POWERSAVE

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Manufacturer	EXAR [Exar Corporation]

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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com

XR16V2751

HIGH PERFORMANCE DUART WITH 64-BYTE FIFO AND POWERSAVE

JANUARY 2007

REV. 1.0.0

GENERAL DESCRIPTION

The XR16V27511 (V2751) is a high performance dual

universal asynchronous receiver and transmitter

(UART) with 64 byte TX and RX FIFOs. The device

operates from 2.25 to 3.6 volts with 5 Volt tolerant

inputs and is pin-to-pin and software compatible to

Exar’s XR16L2751. The device includes 2 additional

capabilities over the XR16V2750: 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 V2751 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

• 2.25 to 3.6 Volt Operation

• 5 Volt Tolerant Inputs

• Pin-to-pin compatible to Exar’s XR16L2751 in the

48-TQFP package

• Two independent UART channels

■ Register set identical to 16L2751

■ Data rate of up to 8 Mbps at at 3.3 V, and

4 Mbps at 2.5 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

(upto 64MHz) input

• 48-TQFP package

FIGURE 1. XR16V2751 BLOCK DIAGRAM

XTAL1

XTAL2

Crystal Osc/Buffer

TXA, RXA, DTRA#,

DSRA#, RTSA#,

DTSA#, CDA#, RIA#,

OP2A#

Intel or

Motorola

Data Bus

Interface

UART Channel A

64 Byte TX FIFO

64 Byte RX FIFO

BRG

IR

ENDEC

TX & RX

UART

Regs

2.25 to 3.6V VCC

GND

*5 Volt Tolerant Inputs

(Except XTAL1)

TXB, RXB, DTRB#,

DSRB#, RTSB#,

CTSB#, CDB#, RIB#,

OP2B#

UART Channel B

(same as Channel A)

A2:A0

D7:D0

CSA# (CS#)

16/68#

CSB# (A3)

INTA (IRQ#)

INTB (logic 0)

PwrSave

IOW# (R/W#)

IOR# (VCC)

Reset (Reset#)

CLKSEL

HDCNTL#

TXRDYA#

TXRDYB#

RXRDYA#

RXRDYB#

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