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Exar Corporation

XRT5897 Datasheet Preview

XRT5897 Datasheet

Seven-Channel E1 Line Interface

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XRT5897
Seven-Channel E1
Line Interface
December 2001-3
FEATURES
D Compliant with ITU G.703 Pulse Mask Template for
2.048Mbps (E1) Rates
D Seven Independent CEPT Transceivers
D Supports Differential Transformer Coupled
Receivers and Transmitters
D On Chip Pulse Shaping for Both 75W and 120W Line
Drivers
D Compliant with ITU G.775 LOS Declaration/Clearing
Recommendation
D Optional User Selectable LOS Declaration/Clearing
Delay
D Compliant with ITU--T G.823 Jitter Tolerance Re-
quirements
D Logical Inputs Accept either 3.3V or 5.0V Levels
D Ultra-Low Power Dissipation
D +3.3V Supply Operation
D Individual Transmit Channel Over Temperature
Protection
APPLICATIONS
D SDH Multiplexer
D Digital Cross Connects
GENERAL DESCRIPTION
The XRT5897 is an optimized seven channel 3.3V line
interface unit fabricated using low power CMOS
technology. The device contains seven independent E1
channels. It is primarily targeted toward SDH multiplexers
that accommodate TU12 Tributary Unit Frames. Line
cards in these units multiplex 21 E1 interfaces into higher
SDH rates. Devices with seven E1 interfaces such as the
XRT5897 provide the most efficient method of
implementing 21 channel line cards. Each channel
performs the driver and receiver functions necessary to
convert bipolar signals to logical levels and vice versa.
The device requires transformers on both receiver and
transmitter sides, and supports both balanced and
unbalanced interfaces.
The device offers two distinct modes of LOS detection.
The first method, which does not require an external
clock, provides an LOS output indication signal with
thresholds and delay that comply with the ITU G.775
requirements. In the second mode, the user provides an
external clock that increases the delay for LOS
declaration and clearing. This feature provides the user
with the flexibility to implement LOS specifications that
require a delay greater than the G.775 requirements.
ORDERING INFORMATION
Part No.
XRT5897IV
Package
100 Lead TQFP (14 x 14 x 1.4mm)
Operating
Temperature Range
-40°C to +75°C
Rev. 1.11
E2001
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 z (510) 668-7000 z FAX (510) 668-7017




Exar Corporation

XRT5897 Datasheet Preview

XRT5897 Datasheet

Seven-Channel E1 Line Interface

No Preview Available !

XRT5897
BLOCK DIAGRAM
TIP
RX INPUT
RING
1:2
RTIP7 (69)
R1
R2
RRING7 (68)
LOSCNT (73)
LOSSEL (38)
Tranceiver 1
Tranceiver 2
Tranceiver 3
Tranceiver 4
Tranceiver 5
Tranceiver 6
Tranceiver 7
Singnal
DPeteeacktor
RXPOS7 (5)
Receive
Comparators
RXNEG7 (6)
VCC
LOS
Detect
Loss
Delay
1
MUX
O
LOS7 (4)
Counter
Transmit
Line
Drivers
TIP
2:1 R3 TTIP7 (89)
9.1
TX OUTPUT
RING
R4 TRING7 (91)
Pulse
Shaping
9.1
0
0
MUX
1
1
NRTRoZZ
CDyuctlye
Adjust
TXCLK7 (87)
TXPOS7 (85)
TXNEG7 (86)
Figure 1. XRT5897 Block Diagram
Receiver Notes
D The same type 1:2CT ratio transformer may be
used at the receiver input and transmitter output.
D R1 and R2 are both 150W for 75W operation, or
240W for 120W operation.
D Return loss exceeds ITU G.703 specification with
these resistors and a 1:2CT ratio input transformer.
LOS (Loss of Signal) Notes
D LOSSEL (pin 38) is connected to logic “1” for ITU
G.775 compliant LOS delay, or to logic 0 for user
programmable additional delay.
D LOSCNT (pin 73) is unconnected when LOSSEL is
logic 1, or connected to an external clock when
LOSSEL is logic 0.
Transmitter Notes
D Return loss exceeds ETSI 300 166 specification
with a 1:2 ratio transformer.
D R3 and R4 are always 9.1W for both 75W and 120W
applications.
D An approach exists that permits the user to operate
the XRT5897 with a 5V power supply. For more
information, please see application note TAN-12.
Rev. 1.11
2


Part Number XRT5897
Description Seven-Channel E1 Line Interface
Maker Exar Corporation
Total Page 21 Pages
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