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XRT82L24AIV Datasheet(PDF) 1 Page - Exar Corporation

Part # XRT82L24AIV
Description  QUAD E1 LINE TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRT82L24AIV Datasheet(HTML) 1 Page - Exar Corporation

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Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com
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XRT82L24A
QUAD E1 LINE TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
AUGUST 2004
REV. 1.1.2
GENERAL DESCRIPTION
The XRT82L24A is a fully integrated Quad (four chan-
nels) short-haul line interface unit for E1(2.048Mbps)
75
Ω or 120Ω applications. Each channel consists of a
receiver with equalizer for reliable data and clock re-
covery, and a transmitter which accepts either single
or dual-rail digital inputs for signal transmission to the
line using a low output impedance line driver. The de-
vice also includes a crystal-less jitter attenuator
which, depending on system requirements, can be
selected in the receive or transmit path through the
Host or Hardware Mode control.
XRT82L24A is a low power CMOS device operating
on a single 3.3V supply with 5V tolerant digital inputs.
FEATURES
• Fully integrated quad, short-haul PCM transceivers
for E1 applications.
• On Chip Receive Equalizer and Transmit Pulse
Shaper for CEPT 75
Ω and 120Ω line terminations
• On chip clock recovery circuit
• Transformer or capacitor coupled receiver inputs
• Crystal-less jitter attenuator can be selected in the
transmit or receive path
• High receiver interference immunity
• Per-channel transmit power shutdown
• Tri-state transmit output capability
• On chip per-channel driver failure monitoring circuit
• On chip HDB3/B8ZS/AMI encoder/decoder func-
tions
• Supports Gapped Clock for Multiplexer Mapper
Applications
• Transmit return loss meets or exceeds ETSI 300
166 standard
• Meets or exceeds specifications in ITU G.703,
G.775, G.736 and G.823; ETSI 300-166
• Meets or exceeds G.783 and G.823 Jitter Specifi-
cations
• 3.3V or 5.0V Logic level inputs
• Single +3.3V Supply Operation
• New Patent# 6,313,671B1 Low Power IC I/O Buffer
APPLICATIONS
• Digital cross connects (DSX-1)
• Channel Banks
• High speed data transmission line cards
• E1 Multiplexer
• Public switching systems and PBX interfaces
FIGURE 1. BLOCK DIAGRAM OF THE XRT82L24A E1 LIU (HOST MODE)
HDB3
Encoder
MUX
Tx/Rx Jitter
Attenuator
Tx Timing
Control
Tx Pulse
Shaper
MUX
Line
Driver
Tx/Rx Jitter
Attenuator
Timing & Data
Recovery
Peak
Detector
& Slicer
Rx
Equalizer
LOS
Detect
HDB3
Decoder
Clock
Generator
MClk
TVDD_n
TTIP_n
TRing_n
TGND_n
Enable/
Disable
RTIP_n
RRing_n
Remote
LoopBack
Local
Analog
LoopBack
Digital
LoopBack
Driver
Monitor
Channel 0
Channel 1
Channel 2
Channel 3
HW/HOST
µµµµP Controller & Hardware Interface
ADD [0:3]
D[0:7]
WR_R/W/TxOFF_0
ALE_AS/TxOFF_2
CS/TxOFF_3
RD_DS/TxOFF_1
Test
TxClk_n/RZData_n
TxPOS_n/TDATA_n
TxNEG_n
RxClk_n
RxPOS_n/RDATA_n
RxNEG_n/LCV_n
RxLOS_n
INT
RDY_DTACK
PClk/Codes
PTS1/ClkE
PTS2/SR_DR
Reset
ICT


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