XRT4500 Datasheet, PDF (1/99 Pages) Exar Corporation – MULTIPROTOCOL SERIAL NETWORK INTERFACE IC

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XRT4500
SEPTEMBER 2002
MULTIPROTOCOL SERIAL NETWORK INTERFACE IC
REV. 1.0.7
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
V.10, V.11, V.35, V.28
High Speed Transceiver
RX1
TX1
RX2
TX2
RX3
TX3
Handshaking/Control Transceivers
Signals
TXD, RXD
High Speed Data
and Clock
TXC, RXC
High Speed Data
and Clock
SCTE Signals:
DCE Transmitter,
DTE Receiver
V.10, V.11, ---- , V.28
RX4
TX4
RTS, CTS
V.10, V.11, ---- , V.28
V.10, V.11, ---- , V.28
RX5
TX5
RX6
TX6
Diagnostic Transceivers
DTR, DSR
DCD Signals:
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
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 • [phone] • FAX [phone] • www.exar.com