XRT75L00D

Single-Chip Desynchronizer & J.A. for Mapping/Demapping between SONET/SDH & DS3/E3 Environments
Data Sheets OBS (Obsolete)

Overview

# of Channels 1
Data Rate(s) DS3, E3, STS-1
Clk Rec Yes
SH/LH n/a
Temperature Range (°C) Ind.
Op Pwr Sup/Max Cur 3V ±5%
Package TQFP-52
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Recognized for an already robust series of physical layer, access and metro products, Exar extends its capabilities by releasing the industry's first monolithic desynchronization solution for mapping/demaping from SONET/SDH (synchronous) to DS3/E3 (asynchronous). The XRT75L00D is a single-channel DS3/E3/STS-1 Line Interface Unit (LIU). Using an innovative combination of analog and digital signal processing technologies this new approach will be embedded in Exar's physical interface and data aggregation devices.

The XRT75L00 is the next generation solution for the design challenges presented by jitter. Previously, Exar launched the XRT71D00, the industry's first standards compliant jitter attenuator for DS3/E3 applications. It was soon followed by the industry's first multi-channel jitter attenuators (XRT71D03 and XRT71D04).

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 is complete the signal is suitable for retransmission and returned to the data stream.

Product Highlights

The XRT75L00D has an independent receiver, transmitter and jitter attenuator in a single 52-pin TQFP package. It supports E3 (34.368.Mbps), DS3 (44.736Mbps) and STS-1 (51.84 Mbps) operations, has a differential receiver which 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. The XRT75L00D provides both serial microprocessor interface as well as hardware mode for additional programming and control. It also supports local, remote and digital loop-backs.

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 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.

Receiver:

  • On-Chip Clock and Data Recovery Circuit for High-Input Jitter Tolerance
  • On-Chip B3ZS/HDB3 Encoder/Decoder Can be Disabled or Enabled
Transmitter:
  • Tri-state Transmit Output Capability for Redundancy Applications
  • Transmitter Can be Turned On or Off
Jitter Attenuator:
  • Jitter Attenuator Can be Selected in Receive or Transmit Paths
  • Selectable FIFO Size of 16 or 32 Bits
Control and Diagnostics:
  • Five Wire Serial Microprocessor for Control and Configuration
  • Supports Optional Internal Transmit Driver Monitoring
  • Pb-Free, RoHS Compliant Versions Offered

  • E3/DS3 Access Equipment
  • STS-1-SPE to DS# Mapper 
  • DSLAMs
  • Digital Cross Connect Systems
  • CSU/DSC Equipment
  • Routers
  • Fiber Optic Terminals

Documentation & Design Tools

Type Title Version Date File Size
Data Sheets XRT75L00D E3/DS3/STS-1 Interface Unit with SONET Desynchronizer 1.0.2 February 2004 894.8 KB
Application Notes TAN-200, MaxLinear APIs - OS Portability 1.0.0 August 2007 88.5 KB
Application Notes TAN-075, DS-3/E3 LIU Layout Recommendations 1.0.0 February 2007 29.8 KB
Application Notes TAN-025, Interfacing the Microprocessor Serial Interface of the XRT730X Family of DS3/E3/STS-1 LIU Devices to the SPI Port of the MC68360 QUICC Device 1.3 July 2004 16 KB
Schematics & Design Files Schematic 1.0.0 January 2004 65.4 KB
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Parts & Purchasing

Part Number Pkg Code Min Temp Max Temp Status Suggested Replacement PDN
XRT75L00DIV LQFP52 OBS
XRT75L00DIV-F LQFP52 -40 85 OBS XRT75VL00IV-F
XRT75L00DIVTR-F LQFP52 OBS
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Part Status Legend
Active - the part is released for sale, standard product.
EOL (End of Life) - the part is no longer being manufactured, there may or may not be inventory still in stock.
CF (Contact Factory) - the part is still active but customers should check with the factory for availability. Longer lead-times may apply.
PRE (Pre-introduction) - the part has not been introduced or the part number is an early version available for sample only.
OBS (Obsolete) - the part is no longer being manufactured and may not be ordered.
NRND (Not Recommended for New Designs) - the part is not recommended for new designs.

Packaging

Pkg Code Details Quantities Dimensions PDF
LQFP52
  • JEDEC Reference: MO-026
  • MSL Pb-Free: L3 @ 260ºC
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 54.0ºC/W
  • Bulk Pack Style: Tray
  • Quantity per Bulk Pack: n/a
  • Quantity per Reel: 1000
  • Quantity per Tube: n/a
  • Quantity per Tray: 160
  • Reel Size (Dia. x Width x Pitch): 330 x 24 x 16
  • Tape & Reel Unit Orientation: Pin 1 at sprocket hole.
  • Dimensions: mm
  • Length: 10.00
  • Width: 10.00
  • Thickness: 1.60
  • Lead Pitch: 0.65

Notifications

Distribution Date Description File
07/12/2017 Product Discontinuation Notice
12/05/2013 Addition of an alternate qualified assembly site, ASE Chung-Li (Taiwan) for assembly using copper or gold wire bonding. Material change and alternate assembly site.

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