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Exar Corporation

XRT73LC00 Datasheet Preview

XRT73LC00 Datasheet

E3/DS3/STS-1 LINE INTERFACE UNIT

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PRELIMINARY
XRT73LC00
AUGUST 2002
E3/DS3/STS-1 LINE INTERFACE UNIT
REV. P1.0.1
GENERAL DESCRIPTION
The XRT73LC00 DS3/E3/STS-1 Line Interface Unit is
a low power CMOS version of the XRT73L00A and
consists of a line transmitter and receiver integrated
on a single chip and is designed for DS3, E3 or SO-
NET STS-1 applications.
XRT73LC00 can be configured to support the E3
(34.368 Mbps), DS3 (44.736 Mbps) or the SONET
STS-1 (51.84 Mbps) rates.
In the transmit direction, the XRT73LC00 encodes in-
put data to either B3ZS (for DS3/STS-1 applications)
or HDB3 (for E3 applications) format and converts the
data into the appropriate pulse shapes for transmis-
sion over coaxial cable via a 1:1 transformer.
In the receive direction the XRT73LC00 performs
equalization on incoming signals, performs Clock Re-
covery, decodes data from either B3ZS or HDB3 for-
mat, converts the receive data into TTL/CMOS for-
mat, checks for LOS or LOL conditions and detects
and declares the occurrence of line code violations.
The XRT73LC00 also contains a 4-Wire Microproces-
sor Serial Interface for accessing the on-chip Com-
mand registers.
FEATURES
Incorporates an improved Timing Recovery circuit
and is pin and functional compatible to XRT73L00A
Meets E3/DS3/STS-1 Jitter Tolerance Require-
ments
Full Loop-Back Capability
Transmit and Receive Power Down Modes
Full Redundancy Support
Contains a 4-Wire Microprocessor Serial Interface
Uses Minimum External components
Low Power CMOS Design
Single +3.3V Power Supply
5 V Tolerant pins
-40°C to +85°C Operating Temperature Range
Available in a 44 pin TQFP package
APPLICATIONS
Interfaces to E3, DS3 or SONET STS-1 Networks
CSU/DSU Equipment
PCM Test Equipment
Fiber Optic Terminals
Multiplexers
FIGURE 1. BLOCK DIAGRAM OF THE XRT73LC00
E3
S T S -1 /D S 3
Host/(HW )
RLOL EXCLK
ICT RCLKINV
R T IP
R R IN G
REQ DIS
LOSTHR
SDI
SDO /(LCV)
S C lk
CS
REGRESET
TTIP
T R IN G
M TIP
M RING
DMO
AGC/
Equalizer
Peak
Detector
Slicer
C lo c k
Recovery
LOS Detector
Serial
Processor
Interface
Loop MUX
Data
Recovery
Invert
HDB3/
B3ZS
Decoder
D e v ic e
M o n ito r
Pulse
Shaping
Tx
Control
HDB3/
B3ZS
Encoder
Transm it
Logic
Duty Cycle Adjust
RCLK1
L C V /(R C L K 2 )
RPOS
RNEG
D R /S R
RLOS
LLB
RLB
E N D E C D IS
TAOS
TPDATA
TNDATA
T C lk
TXLEV
TXOFF
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com




Exar Corporation

XRT73LC00 Datasheet Preview

XRT73LC00 Datasheet

E3/DS3/STS-1 LINE INTERFACE UNIT

No Preview Available !

XRT73LC00
E3/DS3/STS-1 LINE INTERFACE UNIT
REV. P1.0.1
ORDERING INFORMATION
PART NUMBER
XRT73LC00IV
PACKAGE TYPE
44 Pin TQFP (10mm x 10mm)
áç
PRELIMINARY
OPERATING TEMPERATURE RANGE
-40°C to +85°C
FIGURE 2. PIN OUT OF THE XRT73LC00 IN THE 44 PIN TQFP
44 43 42 41 40 39 38 37 36 35 34
TxLEV 1
TAOS 2
TxAVDD 3
DMO 4
TxAGND 5
AGND 6
RxAGND 7
RTIP 8
RRING 9
RxAVDD 10
REGRESET/
RCLK2INV
11
XRT73LC00
(Top View )
12 13 14 15 16 17 18 19 20 21 22
33 RPOS
32 RNEG
31 RCLK1
30 LCV/(RCLK2)
29 RxDVDD
28 RxDGND
27 EXCLK
26 DVDD
25 DGND
24 RLOS
23 RLOL
2


Part Number XRT73LC00
Description E3/DS3/STS-1 LINE INTERFACE UNIT
Maker Exar Corporation
Total Page 30 Pages
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