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PDF XRT59L91 Data sheet ( Hoja de datos )
| Número de pieza | XRT59L91 | |
| Descripción | Single-Chip E1 Line Interface Unit | |
| Fabricantes | Exar Corporation | |
| Logotipo |  |
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Preliminary
FEATURES
l Complete E1 (CEPT) line interface unit
(Transmitter and Receiver)
l Generates transmit output pulses that are
compliant with the ITU-T G.703 Pulse Template
for 2.048Mbps (E1) rates
l On-Chip Pulse Shaping for both 75W and 120W
Line Drivers
l Receiver can either be transformer or capaci-
tively-coupled to the line
l Detects and Clears LOS (Loss of Signal) per
ITU-T G.775
l Compliant with the ITU-T G.823 Jitter Tolerance
Requirements
l Compliant with the ITU-T G.703 EOS Over-
voltage protection requirements
XRT59L91
Single-Chip E1
Line Interface Unit
October 1999-1
l Supports both Local- and Remote-Loop back
Operations
l Logic Inputs accept either 3.3V or 5.0V levels
l Operates over the Industrial Temperature Range
l Ultra Low Power Dissipation
l +3.3V Supply Operation
APPLICATIONS
l PDH Multiplexers
l SDH Multiplexers
l Digital Cross-Connect Systems
l DECT (Digital European Cordless Telephone)
Base Stations
l CSU/DSU Equipment.
l Test Equipment
GENERAL DESCRIPTION
The XRT59L91 is an optimized single-chip analog 3.3V
E1 line interface unit (LIU) fabricated using low power
CMOS technology. The LIU IC consists of both a
Transmitter and a Receiver function. The Transmitter
accepts a TTL or CMOS level signal from the Terminal
Equipment; and outputs this data to the line via bipolar
pulses that are compliant to the ITU-T G.703 pulse
template for E1. The Receiver accepts an attenuated
bipolar line signal (from the remote terminal equipment)
and outputs this data to the (near-end) terminal equip-
ment via CMOS level signals.
The receiver input can be transformer or capacitively-
coupled to the line. The receiver input is transformer-
coupled to the line, using the 2:1 step-down trans-
former. The transmitter is coupled to the line using a
1:2 step-up transformer. This same configuration is
applicable for both balanced (120W ) and unbalanced
(75W ) interfaces.
ORDERING INFORMATION
Part No.
XRT59L91ID
Package
16 LD JEDEC SOIC (300 mil)
Operating
Temperature Range
-40°C to +85°C
Rev. P2.00
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 · (510) 668-7000 · FAX (510) 668-7017
1 page  
Preliminary
XRT59L91
PIN DESCRIPTION
Pin#
6
7
8
9
10
11
12
13
14
15
16
Symbol
RxPOS
RxNEG
RxLOS
RTIP
RRing
RVSS
RVDD
TTIP
TVDD
TRing
TVSS
Type
O
O
O
I
I
-
-
O
-
O
-
Description
Receive Positive Pulse Output:
This output pin will pulse “high” whenever the XRT59L91 device has
received a “Positive Polarity” pulse, in the incoming line signal, at
RTIP/RRing inputs.
Receive Negative Pulse Output:
This output pin will pulse “high” whenever the XRT59L91 device has
received a “Negative Polarity” pulse, in the incoming line signal, at
RTIP/RRing inputs.
Receive Loss of Signal Output Indicator:
This output pin toggles “high” if the XRT59L91 device has detected a
“Loss of Signal” condition in the incoming line signal.
Receive TIP Input:
This input pin, along with RRing is used to receive the bipolar line
signal from the “Remote E1 Terminal”.
Receive Ring Input:
This input pin, along with RTIP is used to receive the bipolar line
signal from the “Remote E1 Terminal”.
Receiver Ground Pin
Receiver Power Supply Pin: 3.3V + 5%
Transmit TIP Output:
The XRT59L91 device will use this pin, along with TRing, to transmit
a bipolar line signal, via a 1:2 step-up transformer.
Transmitter Power Supply Pin: 3.3V + 5%
Transmit Ring Output:
The XRT59L91 device will use this pin, along with TTIP, to transmit a
bipolar line signal, via a 1:2 step-up transformer.
Transmitter Ground Pin
Rev. P2.00
5
5 Page 
Preliminary
XRT59L91
With input signal as described above, the XRT59L91
device will take each mark (which is provided to it via the
“Transmit Input Interface” block, and will generate a
pulse that complies with the pulse template, presented
in Figure 4 (when measured on the secondary-side of
the Transmit Output Transformer).
1.2 Interfacing the Transmit Section of the
XRT59L91 device to the Line
ITU-T G.703 specifies that the E1 line signal can be
transmitted over coaxial cable and terminated with 75W
or transmitted over twisted-pair and terminated with
120W .
In both applications (e.g., 75W or 120W ), the user is
advised to interface the Transmitter to the Line, in the
manner as depicted in Figures 5 and 6, respectively.
TxPO S
TxNEG
TxLineC lk
U
1
2
TxPO S
3
TxNEG
1
T x C lk
TTIP
1
3
R
1 12
9.
1
T R in g
1
5
R
1 22
9.
1
1:
12
5
48
PE-
65835
J
1
BN
C
1
XRT59L91
Figure 5. Illustration of how to interface the Transmit Section of the
XRT59L91 device to the Line (for “75W ” Applications)
Rev. P2.00
11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet XRT59L91.PDF ] | |
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