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XRT4500
(Rev.:2000)

MULTIPROTOCOL SERIAL NETWORK INTERFACE IC

Exar Corporation 



XRT4500

MULTIPROTOCOL SERIAL NETWORK INTERFACE IC

AUGUST 2000

REV. 1.01

GENERAL DESCRIPTION

The XRT4500 is a fully integrated multiprotocol serial

interface. It supports all of the popular serial commu-

nication interface standards such as ITU-T V.35, ITU-

T V.36, EIA530A, RS232 (ITU-T V.28), ITU-T X.21

and RS449. It can easily be interfaced with most

common types of Serial Communications Controllers

(SCCs). This device contains eight receivers and

eight transmitters, in groups of six or seven. It is a

complete solution containing all of the required

source and load termination resistors in one 80-pin

TQFP package. The XRT4500 operates at higher

speeds (20MHz for V.35 and 256kbps for V.28).

The XRT4500 can be configured to operate in one of

the seven interface standards in either DTE, or DCE

modes of operation and power down mode. It fully

supports echoed clock as well as clock and data in-

version. Loopbacks are supported in DTE and DCE

modes of operation. This feature eliminates the need

for external circuitry for loopback implementation.

Control signals such as RI, RL, DCD, DTR, DSR are

protected against glitches by internal filters. These fil-

ters can be turned off. The XRT4500 provides an in-

ternal oscillator (clock signal) which can be used to

conduct standalone diagnostics of DTE equipment.

BLOCK DIAGRAM

Electrical Interfaces

V.10, V.11, V.35, V.28

V.10, V.11, V.35, V.28

High Speed Transceiver

RX1

TX1

RX2

TX2

Signals

TXD, RXD

High Speed Data

and Clock

TXC, RXC

High Speed Data

and Clock

V.10, V.11, V.35, V.28

RX3

SCTE Signals:

TX3

DCE Transmitter,

DTE Receiver

Handshaking/Control Transceivers

V.10, V.11, ---- , V.28

RX4

TX4

RTS, CTS

V.10, V.11, ---- , V.28

RX5

V.10, V.11, ---- , V.28

RX6

TX5

DTR, DSR

DCD Signals:

TX6

DCE Transmitter,

DTE Receiver

FEATURES

• Pin Programmable Multiprotocol Serial Interface

• V.35, V.36, EIA-530 A, RS232 (V.28), V.10, V.11, X.21

and RS449 Communication Interface Standards

• V.28, V.10, V.11 and V.35 Electrical Interfaces are

‘CTR2’ Compliant

• Contains On-Chip Source and Load Termination

Resistors

• Contains Eight Receivers and Eight Transmitters

with Switchable DTE and DCE Modes

• Glitch Filters on the Control Signals (Selectable)

• +5V Single Power Supply with internal DC-DC

Converter

• Full Support of Loopbacks, Data & Clock Inversion,

and Echoed Clock in DTE and DCE Modes

• Full Support of Most Popular Types of HDLC Control-

lers (Single, Double, and Triple Clocks supported)

• High-speed V.28 Driver: 256KHz

• Internal Oscillator for Standalone DTE Loopback

Testing

• Control Signals Can Be Registered and Non-regis-

tered

• Control Signals Can Be Tri-stated for Bus-based

Designs

• “Cable Safe” Operation Supported

• ESD Protection Over ± 1KV Range

• TTL Level Digital Inputs

• TTL/CMOS Digital Outputs

APPLICATIONS

• Data Service Units (DSU)

• Channel Service Units (CSU)

• Routers

• Bridges

• Access Equipment

Diagnostic Transceivers

V.10, ---- , ---- , V.28

RX7

TX7

LL, RL, RI (TM)

V.10, ---- , ---- , V.28

RX8

TX8

LL, RL, RI (TM)

Mode and Configuration

Control

Switching Regulator

DC-DC Converter

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

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