xrt5997 Exar Corporation, xrt5997 Datasheet

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... Requirements Compliant with ITU G. 703 EOS Over-voltage protection Requirement 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 ...

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... XRT5997 RTIP Receiv Receive e Equalizer Equalizer RRing TTIP TRing Figure 1. XRT5997 Block Diagram Rev. 1.0.0 RxLO S Peak Peak Detector Detector/ Slice Detecto Slicer Detector r r Pulse Pulse Shaping Shaping Circuit Circuit ...

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... IP3 ing3 lk3 25 Rev. 1.0.0 100-Pin 5997IV 100 LEAD THIN QUAD FLAT PACK ( 1.4 mm., TQFP) 3 XRT5997 75 R xPO IP6 ing6 IP7 ...

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... 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 “ ...

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... 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 ...

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... Terminal Equipment needs to transmit a “positive-polarity” pulse onto the line via TTIP1 and TRing1 output pins). 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 “ ...

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... TTIP2 and TRing2 output pins. Transmitter Clock Input – Channel 2: If the user operates Channel 2 (within the XRT5997 device) in the “clocked” mode, then the “Transmit Section” of the Channel 2 will use the falling edge of this signal to sample the data at the TxPOS2 and TxNEG2 input pins. ...

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... RTIP5/RRing5 inputs. Transmitter Clock Input – Channel 5: If the user operates Channel 5 (within the XRT5997 device) in the “clocked” mode, then the “Transmit Section” of the Channel 5 will use the falling edge of this signal to sample the data at the TxPOS5 and TxNEG5 input pins. ...

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... Polarity” pulse, in the incoming line signal, at the RTIP4/RRing4 inputs. Receiver 4 Positive Data Out: This output pin will pulse “high” whenever Channel 4, within the XRT5997 device has received a “Positive Polarity” pulse, in the incoming line signal, at RTIP4/RRing4 inputs. ...

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... TTIP4 and TRing4 output pins). Transmitter Clock Input – Channel 4: If the user operates Channel 4 (within the XRT5997 device) in the “clocked” mode, then the “Transmit Section” of the Channel 4 will use the falling edge of this signal to sample the data at the TxPOS4 and TxNEG4 input pins. ...

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... 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. ...

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... Polarity” pulse, in the incoming line signal, at RTIP6/RRing6 inputs. Receiver 6 Loss of Signal: This output pin toggles “high” if Channel 6, within the XRT5997 device has detected a “Loss of Signal” condition in the incoming line signal. Transmitter - Positive Data Input – Channel 6: The exact signal that should be applied to this input pin depends upon whether the user intends to operate the “ ...

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... Channel 6 within the XRT5997 device will use this pin, along with TRing6, to transmit a bipolar line signal, via a 1:2 step-up transformer. Positive Supply (+3.3V ± 5%), Transmitters 6. Transmitter 6 Negative Bipolar Output: Channel 6 within the XRT5997 device will use this pin, along with TTIP6, to transmit a bipolar line signal, via a 1:2 step-up transformer. Digital Ground. Digital Circuitry. 13 ...

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... Positive Supply: (+3.3V ± 5%), Transmitters 7. Transmitter 7 Negative Bipolar Output: Channel 7 within the XRT5997 device will use this pin, along with TTIP7, to transmit a bipolar line signal, via a 1:2 step-up transformer. Digital Ground: Transmitters 7. Transmitter 1 Negative Bipolar Output: Channel 1 within the XRT5997 device will use this pin, along with TTIP1, to transmit a bipolar line signal, via a 1:2 step-up transformer ...

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... O Rev. 1.0.0 Description Transmitter 1 Positive Bipolar Output. Channel 1 within the XRT5997 device will use this pin, along with TRing1, to transmit a bipolar line signal, via a 1:2 step-up transformer. Digital Ground. Transmitters 1. Transmitter Clock Input – Channel 1: If the user operates Channel 1 (within the XRT5997 device) in the “clocked” ...

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... XRT5997 RECEIVER ELECTRICAL CHARACTERISTICS Unless otherwise specified: T =-40 to 85° Parameter Receiver Loss of Signal: Threshold to Assert Threshold to Clear Time Delay Hysteresis Receiver Sensitivity Interference Margin Input Impedance Jitter Tolerance: 20Hz 700Hz 10KHz —100KHz Return Loss: 51KHz —102KHz 102KHz—2048KHz 2048KHz—3072KHz ...

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... Input pins w/ pull-up resistor.) Input Capacitance Output Load Capacitance Rev. 1.0.0 269ns 244+50 194ns 244-50 Normal Pulse 244 ns 219 ns 244- 244 ns 244+244 244+244 Symbol Min Typ Max VDD 3.13 3.3 3.46 VIH 2.0 - 5.0 VIL -0.5 - 0.8 VOH 2 VOL - - 0 5 XRT5997 Unit ...

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... XRT5997 AC ELECTRICAL CHARACTERISTICS T =-25°C, V =3.3V±5%, unless otherwise specified Parameter TCLK Clock Period TCLK Duty Cycle Transmit Data Setup Time Transmit Data Hold Time Transmit Data Prop. Delay Time - RZ data Mode - NRZ data Mode (clock mode) TCLK Rise Time(10%/90%) TCLK Fall Time(90%/10%) ...

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... Operating the Transmitter in the Clocked Mode The user can configure a given channel (within the XRT5997 device) to operate in the “Clocked” mode by simply applying a 2.048MHz clock signal to the “TxClk_x” input pin (where x denotes a given channel within the XR5997 device). The XRT5997 device contains some circuitry that sense activity on the “ ...

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... U TxP TxN lk_x Figure 2. Illustration on how the XRT5997 Device Samples the data on In general, if the XRT5997 device samples a “1” on the TxPOS_x input pin, then the “Transmit Section” of the device will ultimately generate a positive polarity pulse via the TTIP_x and TRing_x output pins (across a 1:2 transformer) ...

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... TxClk _x Figure 3. Illustration on how the Terminal Equipment should apply data to the “Transmit Section” given Channel (within the XRT5997 Device), when operating in the “Clockless” Mode Figure 3, indicates that when the user is operating a channel in the “Clockless” Mode, then the correspond- ing Terminal Equipment must do the following: Not apply a signal on the “ ...

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... Figure 4. Illustration of the ITU-T G.703 Pulse Template for E1 Applications As a consequence, each channel (within the XRT5997 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, pre- sented in Figure 4, (when measured on the secondary- side of the Transmit Output Transformer) ...

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... TxLineClk_1 TxClk_1 XRT5997 Figure 6. Illustration of how to interface the Transmit Sections the XRT5997 device to the Line (for “120 ” Applications) Notes: 1. Figures 5 and 6, indicate that for both “75 ” and “120 ” applications, the user should connect a 9.1 resistor, in series, between the TTIP/TRing outputs and the transformers ...

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... XRT5997 Transmit Transformer Recommendations Parameter Value Turns Ratio 1:2 Primary Inductance Isolation Voltage Leakage Inductance The following Transformers are Recommended for Use Part Number Vendor PE-65835 Pulse TTI 7154-R Transpower Technologies, Inc. TG26-1205 HALO Note: More transformers will be added to this list as we take the time to evaluate these transformers ...

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... RxPOS_1 2 RxNEG_1 100 Loss of Signal - 1 Figure 7. Recommended Schematic for Interfacing the Receive Sections of the XRT5997 Device to the Line for 75 Applications (Transformer-Coupling) Rev. 1.0.0 2.1 Interfacing the Receive Sections to the Line The design of each channel (within the XRT5997 device) permits the user to transformer-couple or capacitive-couple the Receive Section to the line. ...

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... XRT5997 RxPOS_1 RxNEG_1 100 Loss of Signal - 1 Figure 8. Recommended Schematic for Interfacing the Receive Sections of the XRT5997 Device to the Line for 120 Note: Figures 7 and 8 indicate that the user should use a “2:1 STEP-DOWN” transformer, when interfacing the receiver to the line. Transmit Transformer Recommendations ...

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... RxPOS_1 RxNEG_1 100 Loss of Signal - 1 Figure 9. Recommended Schematic for Interfacing the Receive Sections of the XRT5997 Device to the Line for 75 Applications (Capacitive-Coupling) 2.2 The “Receive Equalizer” Bock After a given Channel (within the XRT5997 device) has received the incoming line signal, via the RTIP_x and RRing_x input pins, the first block that this signal will pass through is the Receive Equalizer block ...

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... LOS Condition if the signal amplitude rises back up to –15dB or above. Figure 10 presents an illustration that depicts the signal levels at which a given channel (within the XRT5997 device) will assert and clear LOS. Maximum Cable Loss for E1 LOS Signal Must be Cleared LOS Signal may be Cleared or Declared ...

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... Terminal Equipment” via the “RxPOS_x and RxNEG_x output pins. If the “Receive Sections” of the XRT5997 device has received a “Positive-Polarity” pulse, via the RTIP_x and RRing_x input pins, then the Receive Output Interface will output a pulse via the “ ...

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... XRT5997 Figure 12. Transmit Timing Diagram Figure 13. Receive Timing Diagram Rev. 1.0.0 NRZ Mode (Clock Mode) ...

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... U1 99 TxPOS_1 TxPOS_1 98 TxNEG_1 TxNEG_1 97 TxLineClk_1 TxClk_1 1 RxPOS_1 RxPOS_1 2 RxNEG_1 RxNEG_1 100 Loss of Signal - 1 RxLOS_1 XRT5997 Figure 14. Illustration on how to interface Channel 1 (of the XRT5997 Device) to the Line (Receiver is Transformer-coupled unbalanced line) Rev. 1.0 TTIP_1 9.1 1 PE-65835 TRing_1 9.1 7 ...

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... TxPOS_1 TxPOS_1 98 TxNEG_1 TxNEG_1 97 TxLineClk_1 TxClk_1 1 RxPOS_1 RxPOS_1 2 RxNEG_1 RxNEG_1 100 Loss of Signal - 1 RxLOS_1 XRT5997 Figure 15, Illustration on how to interface Channel 1 (of the XRT5997 Device) to the Line (Receiver is Transformer-coupled to a 120 balanced line) Rev. 1.0 TTIP_1 9.1 1 PE-65835 Tring_1 9 ...

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... U1 99 TxPOS_1 TxPOS_1 98 TxNEG_1 TxNEG_1 97 TxLineClk_1 TxClk_1 1 RxPOS_1 RxPOS_1 2 RxNEG_1 RxNEG_1 100 Loss of Signal - 1 RxLOS_1 XRT5997 Figure 16. Illustration on how to interface Channel 1 (of the XRT5997 Device) to the Line (Receiver is Capacitive-coupled Rev. 1.0 TTIP_1 9 TRing_1 9 RTIP_1 ...

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... XRT5997 Rev. 1.0.0 34 ...

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... Rev. 1.0.0 Notes 35 XRT5997 ...

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... XRT5997 Rev. 1.0.0 Notes 36 ...

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... EXAR Corporation is adequately protected under the circumstances. Copyright 1999 EXAR Corporation Datasheet September 1999 Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited. Rev. 1.0.0 NOTICE 37 XRT5997 ...