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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 l l l
Logic Inputs Accept Either 3.3V or 5.0V Levels Operates over the Industrial Temperature Range Ultra Low Power Dissipation +3.3V Supply Operation
APPLICATIONS
l l l l
l
PDH Multiplexers SDH Multiplexers Digital Cross-Connect Systems DECT (Digital European Cordless Telephone) Base Stations 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 equipment via CMOS level signals. Each Receiver input can be transformer or capacitivecoupled to the line. The Receiver input is transformercoupled to the line, using a 2:1 step-down transformer. Each Transmitter is coupled to the line using a 1:2 stepup 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
XRT5997
Channel 7 Channel 6 Channel 5 Channel 4 RxLO S Channel 3 Channel 2 Channe l1 RTIP RRing Receiv Receive e Equalizer Equalizer Peak Peak Detector/ Detector/ Slice Slicer r LO SS LO Detecto Detector r Receive Receive O utput O utput Interfac Interface e RxPO S RxNEG
TTIP
PulsePulse Shaping Shaping Circuit Circuit
Transm it Transm it Input Input Interface Interface
TxPO S TxNEG TxClk
TRing
Figure 1. XRT5997 Block Diagram
Rev. 1.0.0
2
XRT5997
PIN CONFIGURATION
TxNEG1
TxNEG7
TxPOS7
TxNEG6
TxPOS1
TGND1
TGND7
TGND6
TVDD1
TVDD7
DGND
TVDD6
TTIP1
TTIP7
TTIP6
LOS1
TxPOS6 77
TRing1
TRing7
TRing6
TxClk1
TxClk7
DGND
TxClk6
100
99
98
97
96
95
94
93
92
91
90
89
88
87
86
85
84
83
82
81
80
79
78
76
LOS6
R xPO S 1 R xN E G 1 DVDD LO S7 R xPO S 7 R xN E G 7 R T IP1 R R ing1 AV D D AG N D AV D D R R ing2 R T IP2 AG N D T T IP2 TVDD2 T R ing2 TGND2 T R ing3 TVDD3 T T IP3 TGND3 R T IP3 R R ing3 T xC lk3
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 41 42 43 44 45 46 47 48 49 31 32 33 34 35 36 37 38 39 26 27 28 29 30 40 50
75 74 73 72 71 70 69 68 67
R xPO S 6 R xN E G 6 DGND AG N D R T IP6 R R ing6 R T IP7 R R ing7 AV D D AG N D AV D D R R ing5 R T IP5 TGND5 T T IP5 TVDD5 T R ing5 TGND4 T R ing4 TVDD4 T T IP4 DGND R T IP4 R R ing4 T xC lk4
100-Pin TQFP X RT 5997IV
66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51
LOS3
LOS2
LOS5
TxNEG2
DGND
DVDD
DVDD
LOS4
RxNEG3
RxNEG2
RxNEG5
RxNEG4
TxNEG3
RxPOS3
RxPOS2
RxPOS5
TxNEG5
100 LEAD THIN QUAD FLAT PACK (14 x 14 x 1.4 mm., TQFP)
Rev. 1.0.0
3
RxPOS4
TxNEG4
TxPOS2
TxPOS5
TxPOS3
TxPOS4
TxClk2
TxClk5
XRT5997
PIN DESCRIPTION
Pin# 1 Symbol RxPOS1 Type O Description Receiver 1 Positive Data Out: This output pin will pulse “high” whenever Channel 1, within the XRT5997 device has received a “Positive Polarity” pulse, in the incoming line signal, at RTIP1/RRing1 inputs. 2 RxNEG1 O Receiver 1 Negative Data Out: This output pin will pulse “high” whenever Channel 1, within the XRT5997 device has received a “Negative Polarity” pulse, in the incoming line signal, at tRTIP1/RRing1 inputs. Positive Supply - (+3.3V ± 5%). Digital Circuitry. Receiver 7 Loss of Signal Output Indicator: This output pin toggles “high” if Channel 7, within the XRT5997 device has detected a “Loss of Signal” condition in the incoming line signal. Receiver 7 Positive Data Out: This output pin will pulse “high” whenever Channel 7, within the XRT5997 device has received a “Positive Polarity” pulse, in the incoming line signal, at RTIP7/RRing7 inputs. Receiver 7 Negative Data Out: This output pin will pulse “high” whenever Channel 7, within the XRT5997 device has received a “Negative Polarity” pulse, in the incoming line signal, at RTIP7/RRing7 inputs. Receiver 1 Positive Bipolar Input: The Receive Section of Channel 1 uses this input pin, along with RRing1 to receive the bipolar line signal from the “Remote E1 Terminal”. Receiver 1 Negative Bipolar Input: The Receive Section of Channel 1 uses this input pin, along with RTIP1 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 1, 2, 3, 5. I Receiver 2 Negative Bipolar Input: The Receive Section of Channel 2 uses this input pin, along with RTIP2 to receive the bipolar line signal from the “Remote E1 Terminal”. Receiver 2 Positive Bipolar Input: The Receive Section of Channel 2 uses this input pin, along with RRing2 to receive the bipolar line signal from the “Remote E1 Terminal”.
3 4
DVDD LOS7
O
5
RxPOS7
O
6
RxNEG7
O
7
RTIP1
I
8
RRing1
I
9 10 11 12
AVDD AGND AVDD RRing2
-
13
RTIP2
I
Rev. 1.0.0
4
XRT5997
PIN DESCRIPTION (CONT'D)
Pin# 14 15 Symbol AGND TTIP2 Type O 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. 18 19 TGND2 TRing3 O 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. O 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. I 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.
16 17
TVDD2 TRing2
O
20 21
TVDD3 TTIP3
22 23
TGND3 RTIP3
24
RRing3
I
25
TxClk3
I
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
XRT5997
PIN DESCRIPTION (CONT'D)
Pin# 26 Symbol TxNEG3 Type I Description Transmitter - Negative Data Input – Channel 3: The exact signal that should be applied to this input pin depends upon whether the user intends to operate the “Transmit Section” (of Channel 3) in the “Clocked” or “Clockless” Mode. Clocked Mode: The Terminal Equipment should apply bit-wide NRZ pulses on this input pin, whenever the Terminal Equipment needs to transmit a “negativepolarity” pulse onto the line via TTIP3 and TRing3 output pins. The XRT5997 device will sample this input pin upon the falling edge of the TClk3 signal. Clockless Mode: The Terminal Equipment should apply RZ pulses to this input pin, anytime the Terminal Equipment needs to transmit a “negative-polarity” pulse onto the line viaTTIP3 and TRing3 output pins. 27 TxPOS3 I Transmitter - Positive Data Input – Channel 3: The exact signal that should be applied to this input pin depends upon whether the user intends to operate the “Transmit Section” (of Channel 3) in the “Clocked” or “Clockless” Mode. Clocked Mode: The Terminal Equipment should apply bit-wide NRZ pulses on this input pin, whenever the Terminal Equipment needs to transmit a “positivepolarity” pulse onto the line via TTIP1 and TRing1 output pins. The XRT5997 device will sample this input pin upon the falling edge of the TClk1 signal. Clockless Mode: The Terminal Equipment should apply RZ pulses to this input pin, anytime the Terminal Equipment needs to transmit a “positive-polarity” pulse onto the line via TTIP1 and TRing1 output pins). 28 LOS3 O Receiver 3 – Loss of Signal Output Indicator: This output pin toggles “high” if Channel 3, within the XRT5997 device has detected a “Loss of Signal” condition in the incoming line signal. Receiver 3 Positive Data Out: This output pin will pulse “high” whenever Channel 3, within the XRT5997 device has received a “Positive Polarity” pulse, in the incoming line signal, at RTIP3/RRing3 inputs.
29
RxPOS3
O
Rev. 1.0.0
6
XRT5997
PIN DESCRIPTION (CONT'D)
Pin# 30 Symbol RxNEG3 Type O Description Receive
