Features: RECEIVER:· R3 Technology (Reconfigurable, Relayless Redundancy)· On chip Clock and Data Recovery circuit for high input jitter tolerance· Meets E3/DS3/STS-1 Jitter Tolerance Requirement· Detects and Clears LOS as per G.775· Receiver Monitor mode handles up to 20 dB flat loss with 6 dB ca...
XRT75R03D: Features: RECEIVER:· R3 Technology (Reconfigurable, Relayless Redundancy)· On chip Clock and Data Recovery circuit for high input jitter tolerance· Meets E3/DS3/STS-1 Jitter Tolerance Requirement· D...
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RECEIVER:
· R3 Technology (Reconfigurable, Relayless Redundancy)
· On chip Clock and Data Recovery circuit for high input jitter tolerance
· Meets E3/DS3/STS-1 Jitter Tolerance Requirement
· Detects and Clears LOS as per G.775
· Receiver Monitor mode handles up to 20 dB flat loss with 6 dB cable attenuation
· On chip B3ZS/HDB3 encoder and decoder that can be either enabled or disabled
· On-chip clock synthesizer provides the appropriate rate clock from a single 12.288 MHz Clock
· Provides low jitter output clock
TRANSMITTER:
· R3 Technology (Reconfigurable, Relayless Redundancy)
· Compliant with Bellcore GR-499, GR-253 and ANSI T1.102 Specification for transmit pulse
· Tri-state Transmit output capability for redundancy applications
· Each Transmitter can be independently turned on or off
· Transmitters provide Voltage Output Drive
JITTER ATTENUATOR:
· On chip advanced crystal-less Jitter Attenuator for each channel
· Jitter Attenuator can be selected in Receive or Transmit paths
· Meets ETSI TBR 24 Jitter Transfer Requirements
· Compliant with jitter transfer template outlined in ITU G.751, G.752, G.755 and GR-499-CORE,1995standards
· Jitter Attenuator can be disabled
CONTROL AND DIAGNOSTICS:
· 5 wire Serial Microprocessor Interface for control and configuration
· Supports optional internal Transmit driver monitoring
· Hardware Mode for control and configuration
· Each channel supports Local, Remote and Digital Loop-backs
· Single 3.3 V ± 5% power supply
· 5 V Tolerant I/O
· Available in 128 pin LQFP
· - 40°C to 85°C Industrial Temperature Range
Specifications | |
No. ofCH | 3 |
DataRate(s) | DS3, E3, STS-1 |
Clk Rec | Yes |
SH/LH | n/a |
Temp.Range | Ind. |
OpPwr Sup/Max Cur | 3V ±5% |
Pkgs | TQFP-128 |
SYMBOL | PARAMETER | MIN | MAX | UNITS | COMMENTS |
VDD | Supply Voltage | -0.5 | 6.0 | V | Note 1 |
VIN | Input Voltage at any Pin | -0.5 | 5.5 | V | Note 1 |
IIN | Input current at any pin | 100 | mA | Note 1 | |
STEMP | Storage Temperature | -65 | 150 | Note 1 | |
ATEMP | Ambient Operating Temperature | -40 | 85 | linear airflow 0 ft./min | |
Theta JA | Thermal Resistance | 23 | /W | linear air flow 0ft/min (See Note 3 below) | |
MLEVL | Exposure to Moisture | 5 | level | EIA/JEDEC JESD22-A112-A | |
ESD | ESD Rating | 2000 | V | Note 2 |
Exar's R3 TechnologyTM was first introduced in 2002 as a breakthrough capability delivering key benefits to customers designing interface cards. Devices utilizing the technology are Reconfigurable with integrated clock synthesizer supporting DS3/E3/STS-1 clock rates from a single clock source. This capability of XRT75R03D enables customers to build one board with a single bill-of-materials, and gives them the agility to quickly respond and reconfigure devices for compressed design cycles. In addition, the series employs Relayless Redundancy eliminating the need for external relays for 1:1 and 1+1 applications by establishing a back-up channel that can be brought on-line in the event of failure.
The first T3/E3/STS-1 products to offer R3 TechnologyTM are the XRT75R03D (three) and XRT75R12D (twelve) Previously, Exar has offered this capability only on its T1/E1 LIU products. Now customers doing T3/E3 designs can take advantage of this unique technology saving time and cost in implementing redundancy as well as supporting global standards for Telecom.
Product Highlights
The XRT75Rxx series has an independent receiver, transmitter and jitter attenuator in a single 52-pin TQFP package. XRT75R03D supports E3 (34.368.Mbps), DS3 (44.736Mbps) and STS-1 (51.84 Mbps) operations, has a differential receiver that provides a high noise interference margins -- capable of receiving data from cables of over 1,000 feet, or up to 12dB of cable attenuation. The device has an onboard Pseudo Random Binary Sequence (PRBS) generator and detector that can insert and detect single bit errors. This function is often used for diagnostic purposes. In addition, Exar adds desynchronization capability in its XRT75RxxD family.What is Clock Desynchronization?
The process of mapping and subsequent de-mapping of DS3/E3 signals into SONET introduces excessive jitter and timing irregularities. Examples of jitter sources include mapping jitter, caused by bit justification, or stuffing, and pointer jitter, the outcome of frequency mismatches between networks that causes pointer movement. Current desynchronizing solutions use both a very narrow-bandwidth crystal oscillator based Phase Locked Loop (PLL) referred to as a Voltage Control Oscillator (VCXO), and a deep FIFO for each data rate and channel. For multi-channel/multi-rate applications, chip requirements can rise at exponential levels driven by the number of supported rates and channels. Enter Exar's solution; XRT75R03D uses only one highly integrated programmable PLL, now each channel can support multi-rate (DS3, E3 or STS-1) operations. Here jitter/timing irregularities are removed, and then desynchronized to provide a smooth GR-253-CORE specification-compliant clock signal. Once this operation is complete the signal is suitable for retransmission and returned to the data stream.Standard's Compliance
The receiver, transmitter, and jitter attenuator all meet Bellcore GR-499 CORE requirements. Also, the transmitter meets the GR-253 CORE and ANSI T1.102 specifications, and XRT75R03D includes a duty cycle correction PLL. The device meets jitter and wander specifications described in the T1.105.03b, and ETSI TBR-24, and is compliant with jitter transfer templates outlined in ITU G.751, G.752 and G.755.The first T3/E3/STS-1 products to offer R3 TechnologyTM are the XRT75R03D (three) and XRT75R12D (twelve) Previously, Exar has offered this capability only on its T1/E1 LIU products. Now customers doing T3/E3 designs can take advantage of this unique technology saving time and cost in implementing redundancy as well as supporting global standards for Telecom.
Product Highlights
The XRT75Rxx series has an independent receiver, transmitter and jitter attenuator in a single 52-pin TQFP package. XRT75R03D supports E3 (34.368.Mbps), DS3 (44.736Mbps) and STS-1 (51.84 Mbps) operations, has a differential receiver that provides a high noise interference margins -- capable of receiving data from cables of over 1,000 feet, or up to 12dB of cable attenuation. The device has an onboard Pseudo Random Binary Sequence (PRBS) generator and detector that can insert and detect single bit errors. This function is often used for diagnostic purposes. In addition, Exar adds desynchronization capability in its XRT75RxxD family.What is Clock Desynchronization?
The process of mapping and subsequent de-mapping of DS3/E3 signals into SONET introduces excessive jitter and timing irregularities. Examples of jitter sources include mapping jitter, caused by bit justification, or stuffing, and pointer jitter, the outcome of frequency mismatches between networks that causes pointer movement. Current desynchronizing solutions use both a very narrow-bandwidth crystal oscillator based Phase Locked Loop (PLL) referred to as a Voltage Control Oscillator (VCXO), and a deep FIFO for each data rate and channel. For multi-channel/multi-rate applications, chip requirements can rise at exponential levels driven by the number of supported rates and channels. Enter Exar's solution; it uses only one highly integrated programmable PLL, now each channel can support multi-rate (DS3, E3 or STS-1) operations. Here jitter/timing irregularities are removed, and then desynchronized to provide a smooth GR-253-CORE specification-compliant clock signal. Once this operation of XRT75R03D is complete the signal is suitable for retransmission and returned to the data stream.Standard's Compliance
The receiver, transmitter, and jitter attenuator all meet Bellcore GR-499 CORE requirements. Also, the transmitter meets the GR-253 CORE and ANSI T1.102 specifications, and it includes a duty cycle correction PLL. The XRT75R03D device meets jitter and wander specifications described in the T1.105.03b, and ETSI TBR-24, and is compliant with jitter transfer templates outlined in ITU G.751, G.752 and G.755.The XRT75R03D is a three-channel fully integrated Line Interface Unit (LIU) featuring EXAR's R3 Technology (Reconfigurable, Relayless Redundancy) with Jitter Attenuator for E3/DS3/STS-1 applications. It incorporates 3 independent Receivers, Transmitters and Jitter Attenuators in a single 128 pin LQFP package.
Each channel of the XRT75R03D can be independently configured to operate in the data rate, E3 (34.368 MHz), DS3 (44.736 MHz) or STS-1 (51.84 MHz). Each transmitter can be turned off and tristated for redundancy support or for conserving power.
The XRT75R03D's differential receiver provides high noise interference margin and is able to receive the data over 1000 feet of cable or with up to 12 dB of cable attenuation.
The XRT75R03D incorporates an advanced crystalless jitter attenuator per channel that can be selected either in the transmit or receive path. The jitter attenuator performance meets the ETSI TBR-24 and Bellcore GR-499 specifications.
The XRT75R03D provides both Serial Microprocessor Interface as well as Hardware mode for programming and control.
The XRT75R03D supports local, remote and digital loop-backs. The device also has a built-in Pseudo Random Binary Sequence (PRBS) generator and detector with the ability to insert and detect single bit error for diagnostic purposes.