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XRT59L921 PDF даташит

Спецификация XRT59L921 изготовлена ​​​​«Exar Corporation» и имеет функцию, называемую «TWENTY-ONE CHANNEL E1 LINE INTERFACE UNIT».

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Номер произв XRT59L921
Описание TWENTY-ONE CHANNEL E1 LINE INTERFACE UNIT
Производители Exar Corporation
логотип Exar Corporation логотип 

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XRT59L921 Даташит, Описание, Даташиты
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XRT59L921
TWENTY-ONE CHANNEL E1 LINE INTERFACE UNIT
MARCH 2007
REV. 1.2.1
GENERAL DESCRIPTION
The XRT59L921 is an optimized twenty-one channel,
E1, line interface unit, fabricated using low power
CMOS technology. The device contains twenty-one
independent E1 channels. It is primarily targeted
towards the SDH multiplexers that accommodate
TU12 Tributary Unit Frames. Line cards in these units
multiplex 21 E1 channels into higher SDH rates.
Devices with 21 E1 interfaces such as the
XRT59L921 provide the most efficient method of
implementing 63-channel line cards. Each channel
performs the driver and receiver functions necessary
to convert bipolar signals to logical levels and vice
versa.
The receiver input accepts transformer coupled 1:1
signals, while the transmitter is coupled to the line
using a 1:2 transformer. The same transformer
configuration can be used for both balanced and
unbalanced interfaces. The device offers Loss of
Signal (LOS) detection, that provides an LOS output
indication signal with thresholds and delay that
comply with the ITU G.775 requirements.
FEATURES
Twenty-One (21) Independent E1 (CEPT) Line
Interface Units (Transmitter, Receiver, and
Recovery)
Transmit Output Pulses that are Compliant with the
ITU-T G.703 Pulse Template Requirement for
2.048Mbps (E1) Rates
On-Chip Pulse Shaping for both 75and 120line
drivers
Detects and Clears LOS (Loss of Signal) Per ITU-T
G.775
Operates over the Industrial Temperature Range
Ultra Low power consumption
3.3V operation with 5V Tolerant Input
APPLICATIONS
PDH Multiplexers
SDH Multiplexers
Digital Cross-Connect Systems
DECT (Digital European Cordless Telephone) Base
Stations
CSU/DSU Equipment
FIGURE 1. BLOCK DIAGRAM OF THE XRT59L921
RTIP_0
RRing_0
Receive
EquRaelcizeeivr e
Equalizer
LOS Detector
LOS Detector
Peak Detector/Slicer
Peak Detector/Slicer
Channels 2 - 20
Channel 1
Channel 0
LOS_0
Receive Output
RIencterivfaecOe utput
Interface
RxPOS_0
RxNEG_0
TTIP_0
TRing_0
TxON
Pulse Shaping Circuit
Pulse Shaping Circuit
Transmit Input Interface
Transmit Input Interface
TxPOS_0
TxCLK_0
TxNEG_0
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com









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XRT59L921 Даташит, Описание, Даташиты
XRT59L921
TWENTY-ONE CHANNEL E1 LINE INTERFACE UNIT
PART NUMBER
XRT59L921IB
ORDERING INFORMATION
PACKAGE
316 Shrink Thin Ball Grid Array
(21.0 mm x 21.0 mm, STBGA)
REV. 1.2.1
OPERATING TEMPERATURE RANGE
-40°C to +85°C
FIGURE 2. PIN OUT OF THE XRT59L921 (BOTTOM VIEW)
20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
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NOTE: Refer to pin list for pin names.
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XRT59L921 Даташит, Описание, Даташиты
REV. 1.2.1
XRT59L921
TWENTY-ONE CHANNEL E1 LINE INTERFACE UNIT
TABLE OF CONTENTS
GENERAL DESCRIPTION................................................................................................. 1
FEATURES ..................................................................................................................................................... 1
APPLICATIONS ............................................................................................................................................... 1
FIGURE 1. BLOCK DIAGRAM OF THE XRT59L921 ............................................................................................................................. 1
ORDERING INFORMATION .................................................................................................................... 2
FIGURE 2. PIN OUT OF THE XRT59L921 (BOTTOM VIEW).................................................................................................................. 2
TABLE OF CONTENTS ............................................................................................................ I
PIN DESCRIPTIONS ........................................................................................................................................ 3
RECEIVER ELECTRICAL CHARACTERISTICS ...................................................................................... 12
TRANSMITTER ELECTRICAL CHARACTERISTICS ............................................................................... 12
FIGURE 3. E1. ITU G.703 PULSE TEMPLATE FOR TRANSMITTER OUTPUT........................................................................................ 13
DC ELECTRICAL CHARACTERISTICS ................................................................................................... 13
AC ELECTRICAL CHARACTERISTICS.................................................................................................... 14
PER CHANNEL POWER CONSUMPTION INCLUDING THE LINE POWER DISSIPATION, TRANMISSION AND RECEIVE PATHS
ALL ACTIVE: ................................................................................................................................................. 14
ABSOLUTE MAXIMUM RATINGS ..................................................................................................................... 14
SYSTEM DESCRIPTION .......................................................................................................................... 15
1.0 THE TRANSMIT SECTION .................................................................................................................. 15
1.1 THE TRANSMIT INPUT INTERFACE ............................................................................................................ 15
1.2 OPERATING THE TRANSMITTER IN THE CLOCK MODE .......................................................................... 15
FIGURE 4. ILLUSTRATION ON HOW THE XRT59L921 SAMPLES THE DATA ON THE TXPOS_N AND TXNEG_N INPUT PINS................... 16
1.2.1 OPERATING THE TRANSMITTER IN THE CLOCKLESS MODE............................................................................. 16
1.2.2 SHUTTING OFF THE TRANSMITER.......................................................................................................................... 16
FIGURE 5. ILLUSTRATION ON HOW THE TERMINAL EQUIPMENT SHOULD APPLY DATA TO THE TRANSMIT SECTION OF A GIVEN CHANNEL (WITH-
IN THE XRT59L921), WHEN OPERATING IN THE CLOCKLESS MODE .................................................................................. 17
1.3 THE PULSE SHAPING CIRCUIT ................................................................................................................... 17
FIGURE 6. ILLUSTRATION OF THE ITU-T G.703 PULSE TEMPLATE FOR E1 APPLICATIONS ................................................................ 18
1.4 INTERFACING THE TRANSMIT SECTIONS OF THE XRT59L921 TO THE LINE ....................................... 18
FIGURE 7. ILLUSTRATION OF HOW TO INTERFACE THE TRANSMIT SECTIONS OF THE XRT59L921 TO THE LINE (FOR 75W APPLICATIONS)
19
FIGURE 8. ILLUSTRATION OF HOW TO INTERFACE THE TRANSMIT SECTIONS THE XRT59L921 TO THE LINE (FOR 120W APPLICATIONS)19
Transmit Transformer Recommendations ................................................................................................................. 19
The following Transformers are Recommended for Use........................................................................................... 20
MAGNETIC SUPPLIER INFORMATION .............................................................................................................. 20
2.0 THE RECEIVE SECTION ..................................................................................................................... 21
2.1 INTERFACING THE RECEIVE SECTIONS TO THE LINE (TRANSFORMER COUPLING) ......................... 21
FIGURE 9. RECOMMENDED SCHEMATIC FOR INTERFACING THE RECEIVE SECTIONS OF THE XRT59L921 TO THE LINE FOR 75W APPLICA-
TIONS (TRANSFORMER-COUPLING) .................................................................................................................................. 21
FIGURE 10. RECOMMENDED SCHEMATIC FOR INTERFACING THE RECEIVE SECTIONS OF THE XRT59L921 TO THE LINE FOR 120W APPLI-
CATIONS (TRANSFORMER-COUPLING) .............................................................................................................................. 22
TRANSFORMER RECOMENDATION ...................................................................................................... 23
Receive Transformer Recommendations .................................................................................................................. 23
2.2 INTERFACING THE XRT59L921 RECEIVE SECTION TO THE LINE (CAPACITIVE COUPLING) ............. 23
FIGURE 11. RECOMMENDED 75W CAPACITIVE COUPLING APPLICATION........................................................................................... 23
FIGURE 12. RECOMMENDED 120W TWISTED PAIR CAPACITIVE COUPLING APPLICATION .................................................................. 23
2.3 THE RECEIVE EQUALIZER BOCK ............................................................................................................... 24
2.4 THE PEAK DETECTOR AND SLICER BLOCK ............................................................................................. 24
2.5 THE LOS DETECTOR BLOCK ...................................................................................................................... 24
FIGURE 13. ILLUSTRATION OF THE SIGNAL LEVELS THAT THE RECEIVER SECTIONS (WITHIN XRT59L921) WILL DECLARE AND CLEAR LOS
24
FIGURE 14. THE BEHAVIOR OF THE LOS OUTPUT INDICATOR, IN RESPONSE TO THE LOSS OF SIGNAL, AND THE RESTORATION OF THE SIG-
NAL ................................................................................................................................................................................ 25
2.6 LOS MUTE DESCRIPTION ............................................................................................................................ 25
2.7 THE RECEIVE OUTPUT INTERFACE BLOCK ............................................................................................. 25
3.0 SHUTTING OFF THE TRANSMITTER ................................................................................................ 25
FIGURE 15. TRANSMIT TIMING DIAGRAM ......................................................................................................................................... 26
FIGURE 16. RECEIVE TIMING DIAGRAM ........................................................................................................................................... 26
APPLICATION INFORMATION................................................................................................................. 27
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Номер в каталогеОписаниеПроизводители
XRT59L921TWENTY-ONE CHANNEL E1 LINE INTERFACE UNITExar Corporation
Exar Corporation

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