參數資料
| 型號： | XRT59L921IB |
| 廠商： | Exar Corporation |
| 文件頁數： | 1/32頁 |
| 文件大小： | 0K |
| 描述： | IC LIU E1 21CH 316STBGA |
| 標準包裝： | 60 |
| 類型： | 線路接口裝置（LIU） |
| 驅動器/接收器數： | 21/21 |
| 規程： | E1 |
| 電源電壓： | 3.13 V ~ 3.46 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 316-LBGA |
| 供應商設備封裝： | 316-STBGA（21x21） |
| 包裝： | 托盤 |
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Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com
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 75 and 120 line
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
Channels 2 - 20
Channel 1
Channel 0
Receive
Equalizer
Receive
Equalizer
Peak Detector/Slicer
LOS Detector
Receive Output
Interface
Receive Output
Interface
Pulse Shaping Circuit
Transmit Input Interface
RxPOS_0
TRing_0
TTIP_0
RRing_0
RTIP_0
LOS_0
TxNEG_0
TxPOS_0
RxNEG_0
TxCLK_0
TxON
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