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PDF XRT5997 Data sheet ( Hoja de datos )
| Número de pieza | XRT5997 | |
| Descripción | Seven-Channel E1 Line Interface Unit | |
| Fabricantes | Exar Corporation | |
| Logotipo |  |
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XRT5997
Seven-Channel E1
Line Interface Unit
November 1999-2
FEATURES
The Main features are as follows:
l Consists of Seven (7) Independent E1 (CEPT)
Line Interface Units (Transmitter and Receiver)
l Generates Transmit Output Pulses that are
Compliant with the ITU-T G.703 Pulse Template
Requirement for 2.048Mbps (E1) Rates
l On-Chip Pulse Shaping for both 75Ω and 120Ω
line drivers
l Receiver Can Either Be Transformer or
Capacitive-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 ITU G. 703 EOS Over-voltage
protection Requirement
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
GENERAL DESCRIPTION
The XRT5997 is an optimized seven-channel analog
E1 line interface unit fabricated using low power 3.3V
CMOS technology. Each channel 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.
Each Receiver input can be transformer or capacitive-
coupled to the line. The Receiver input is transformer-
coupled to the line, using a 2:1 step-down transformer.
Each Transmitter is coupled to the line using a 1:2 step-
up transformer. This same configuration is applicable
for both balanced (120Ω ) and unbalanced (75Ω )
interfaces.
ORDERING INFORMATION
Part No.
XRT5997IV
Package
100-Lead TQFP (14 x 14 x 1.4 mm)
Operating
Temperature Range
-40°C to +85°C
Rev. 1.0.0
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com
1 page  
XRT5997
PIN DESCRIPTION (CONT'D)
Pin#
Symbol
Type
14 AGND
15 TTIP2
-
O
16 TVDD2
17 TRing2
-
O
18 TGND2
19 TRing3
O
20 TVDD3
21 TTIP3
O
22 TGND3
23 RTIP3
I
24 RRing3
I
25 TxClk3
I
Description
Analog Ground - Receiver 1, 2, 3, 5.
Transmitter 2 Positive Bipolar Output:
Channel 2 within the XRT5997 device will use this pin, along with TRing2,
to transmit a bipolar line signal, via a 1:2 step-up transformer.
Positive Supply - (+3.3V ± 5%), Transmitters 2.
Transmitter 2 Negative Bipolar Output:
Channel 2 within the XRT5997 device will use this pin, along with TTIP2, to
transmit a bipolar line signal, via a 1:2 step-up transformer.
Digital Ground - Transmitters 2.
Transmitter 3 Negative Bipolar Output:
Channel 3 within the XRT5997 device will use this pin, along with TTIP3, to
transmit a bipolar line signal, via a 1:2 step-up transformer.
Positive Supply - (+3.3V ± 5%), Transmitters 3.
Transmitter 3 Positive Bipolar Output:
Channel 3 within the XRT5997 device will use this pin, along with TRing3,
to transmit a bipolar line signal, via a 1:2 step-up transformer.
Digital Ground - Transmitters 3.
Receiver 3 Positive Bipolar Input.
The Receive Section of Channel 4 uses this input pin, along with RRing3
to receive the bipolar line signal from the “Remote E1 Terminal”.
Receiver 3 Negative Bipolar Input.
The Receive Section of Channel 3 uses this input pin, along with RTIP3 to
receive the bipolar line signal from the “Remote E1 Terminal”.
Transmitter Clock Input – Channel 3:
If the user operates Channel 3 (within the XRT5997 device) in the “clocked”
mode, then the “Transmit Section” of the Channel 3 will use the falling edge
of this signal to sample the data at the TxPOS3 and TxNEG3 input pins.
Note: If the user operates the Channel 3 in the “clockless” mode, then the
Terminal Equipment should not apply a clock signal to this input pin.
Rev. 1.0.0
5
5 Page 
XRT5997
PIN DESCRIPTION (CONT'D)
Pin#
Symbol
Type
53 RTIP4
I
54 DGND
55 TTIP4
O
56 TVDD4
57 TRing4
O
58 TGND4
59 TRing5
O
60 TVDD5
61 TTIP5
O
62 TGND5
63 RTIP5
64 RRing5
I
I
65 AVDD
66 AGND
67 AVDD
68 RRing7
I
Description
Receiver 4 Positive Bipolar Input.
The Receive Section of Channel 4 uses this input pin, along with RRing4 to
receive the bipolar line signal from the “Remote E1 Terminal”.
Digital Ground. Digital Circuitry.
Transmitter 4 Positive Bipolar Output.
Channel 4 within the XRT5997 device will use this pin, along with TRing4, to
transmit a bipolar line signal, via a 1:2 step-up transformer.
Positive Supply (+3.3V ± 5%), Transmitters 4.
Transmitter 4 Negative Bipolar Output.
Channel 4 within the XRT5997 device will use this pin, along with TTIP4, to
transmit a bipolar line signal, via a 1:2 step-up transformer.
Digital Ground. Transmitters 4.
Transmitter 5 Negative Bipolar Output.
Channel 5 within the XRT5997 device will use this pin, along with TTIP5, to
transmit a bipolar line signal, via a 1:2 step-up transformer.
Positive Supply (+3.3V ± 5%), Transmitters 5.
Transmitter 5 Positive Bipolar Output.
Channel 5 within the XRT5997 device will use this pin, along with TRing5, to
transmit a bipolar line signal, via a 1:2 step-up transformer.
Digital Ground. Transmitters 5.
Receiver 5 Positive Bipolar Input.
The Receive Section of Channel 5 uses this input pin, along with RRing5 to
receive the bipolar line signal from the “Remote E1 Terminal”.
Receiver 5 Negative Bipolar Input.
The Receive Section of Channel 5 uses this input pin, along with RTIP5 to
receive the bipolar line signal from the “Remote E1 Terminal”.
Positive Supply (+3.3V ± 5%). Analog Circuitry.
Analog Ground.
Positive Supply (+3.3V ± 5%). Receiver 4, 6, 7.
Receiver 7 Negative Bipolar Input.
The Receive Section of Channel 7 uses this input pin, along with RTIP7 to
receive the bipolar line signal from the “Remote E1 Terminal”.
Rev. 1.0.0
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet XRT5997.PDF ] | |
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