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PDF XRT5897 Data sheet ( Hoja de datos )
| Número de pieza | XRT5897 | |
| Descripción | Seven-Channel E1 Line Interface | |
| Fabricantes | Exar Corporation | |
| Logotipo |  |
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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
1 page  
XRT5897
PIN DESCRIPTION (CONT’D)
Pin #
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
Symbol
LOS2
VCC
LOSSEL
GND
LOS5
RXPOS5
RXNEG5
TXCLK5
TXNEG5
TXPOS5
RXNEG4
RXPOS4
LOS4
TXPOS4
TXNEG4
TXCLK4
RRING4
RTIP4
GND
TTIP4
VCC
TRING4
GND
TRING5
VCC
TTIP5
GND
RTIP5
RRING5
VCC
GND
VCC
RRING7
RTIP7
RRING6
Type
O
I
O
O
O
I
I
I
O
O
O
I
I
I
I
I
O
O
O
O
I
I
I
I
I
Description
Receiver 2 Loss of Signal. Asserted during LOS condition.
Digital Supply (+3.3V + 5%). Digital circuitry.
Loss of Signal Delay Select. “Hi” selects G.775, “Lo” selects user programmable.1
Digital Ground.
Receiver 5 Loss of Signal. Asserted during LOS condition.
Receiver 5 Positive Data Out. Positive RZ data output for channel 5.
Receiver 5 Negative Data Out. Negative RZ data output for channel 5.
Transmitter 5 Clock Input. Use for clocked mode with NRZ data.1
Transmitter 5 Negative Data Input. Negative NRZ or RZ data input.1
Transmitter 5 Positive Data Input. Positive NRZ or RZ data input.1
Receiver 4 Negative Data Out. Negative RZ data output for channel 4.
Receiver 4 Positive Data Out. Positive RZ data output for channel 4.
Receiver 4 Loss of Signal. Asserted during LOS condition.
Transmitter 4 Positive Data Input. Positive NRZ or RZ data input.1
Transmitter 4 Negative Data Input. Negative NRZ or RZ data input.1
Transmitter 4 Clock Input. Use for clocked mode with NRZ data.1
Receiver 4 Negative Bipolar Input.
Receiver 4 Positive Bipolar Input.
Analog Ground.
Transmitter 4 Positive Bipolar Output.
Positive Supply (+3.3V + 5%). Transmitter channel 4.
Transmitter 4 Negative Bipolar Output.
Digital Ground. Transmitter channel 4.
Transmitter 5 Negative Bipolar Output.
Positive Supply (+3.3V + 5%). Transmitter channel 5.
Transmitter 5 Positive Bipolar Output.
Digital Ground. Transmitter channel 5.
Receiver 5 Positive Bipolar Input.
Receiver 5 Negative Bipolar Input.
Positive Supply (+3.3V + 5%). Low level transmitter analog circuitry.
Analog Ground. Low level transmitter analog circuitry.
Positive Supply (+3.3V + 5%). Receiver channels 4, 5, and 6.
Receiver 7 Negative Bipolar Input.
Receiver 7 Positive Bipolar Input.
Receiver 6 Negative Bipolar Input.
Note:
1 Has internal pull-up 50KW resistor.
Rev. 1.11
5
5 Page 
XRT5897
TXPOS (n)
TXNEG (n)
TXCLK (n)
TXOUT (n)
TSU THO
TSU THO
T1
T2
TR TF
TXPW
T3
T3 VTXOUT
TXPW
VTXOUT
Figure 2. Transmit Timing Diagram
RXIN (n)
T5
RPOS (n)
RXNEG (n)
T4
T5
T6
T4
T7
T6
Rev. 1.11
Figure 3. Receive Timing Diagram
11
T7
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet XRT5897.PDF ] | |
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