XR16V2752_07 datasheet(1/51 Pages) EXAR

Part #	XR16V2752

Description	HIGH PERFORMANCE DUART WITH 64-BYTE FIFO

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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

XR16V2752

HIGH PERFORMANCE DUART WITH 64-BYTE FIFO

MAY 2007

REV. 1.0.1

GENERAL DESCRIPTION

The XR16V27521 (V2752) 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

compatible

to

Exar’s

ST16C2552,

XR16L2552

and

XR16L2752.

The

V2752 register set is identical to the XR16L2752 and

is compatible to the ST16C2552 and the XR16C2852

enhanced features. 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. 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 8 Mbps at 3.3 Volt and 8X sampling

clock. The V2752 is available in 44-pin PLCC 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 Exar’s XR16L2752

• Two independent UART channels

■ Register set compatible to XR16L2752

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

6.25 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

■ Full modem interface

• Alternate Function Register

• Device Identification and Revision

• Crystal oscillator or external clock input

• Crystal oscillator (up to 32MHz) or external clock

(up to 64MHz) input

• 44-PLCC and 32-QFN packages

FIGURE 1. XR16V2752 BLOCK DIAGRAM

MFA#

(OP2A#,

BAUDOUTA#, or

RXRDYA#)

MFB#

(OP2B#,

BAUDOUTB#, or

RXRDYB#)

XTAL1

XTAL2

Crystal Osc/Buffer

TXA (or TXIRA)

8-bit Data

Bus

Interface

UART Channel A

64 Byte TX FIFO

64 Byte RX FIFO

BRG

IR

ENDEC

TX & RX

UART

Regs

2.25 V to 3.6 V VCC

GND

*5 Volt Tolerant Inputs

(Except External Clock Input)

UART Channel B

(same as Channel A)

A2:A0

D7:D0

CS#

CHSEL

INTA

INTB

IOW#

IOR#

Reset

TXRDYA#

TXRDYB#

CTS#A/B, RI#A/B,

CD#A/B, DSR#A/B

RXA (or RXIRA)

Modem Control Logic

DTR#A/B, RTS#A/B

TXB (or TXIRB)

RXB (or RXIRB)

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