Cirrus Logic Home
Home : Cirrus Products : LIUs : CS61880

Octal, E1 Line Interface Unit

The CS61880 is a full-featured Octal E1 short haul LIU that supports 2.048 Mbps data transmission for both 75 Ohms and 120 Ohms applications. Each channel provides crystal-less jitter attenuation that complies with the most stringent standards. Each channel also provides internal AMI/HDB3 encoding/decoding. To support enhanced system diagnostics, channel zero can be configured for G.772 non-intrusive monitoring the receive or transmit paths for any of the seven channels.

The CS61880 makes use of ultra-low power matched impedance transmitters and receivers to reduce power beyond that achieved by traditional driver designs. By achieving a more precise line match, this technique also provides superior return loss characteristics. Additionally, the internal line matching circuitry reduces the external component count. All transmitters have controls for independent power down and tristate.

Each receiver provides reliable data recovery with over 12 dB of cable attenuation. The receiver also incorporates LOS detection compliant to the most recent specifications.

Product Features
  • Octal E1 short-haul line interface unit
  • Internal AMI or HDB3 encoding/decoding
  • LOS detection per ITU G.775, ETSI 300-233
  • G.772 non-intrusive monitoring
  • Crystal-less jitter attenuation
  • Serial/parallel microprocessor control interfaces
  • Transmitter short circuit current limiter (<50mA)
  • TX drivers with fast tristate and power-down
  • JTAG boundary scan compliant to IEEE 1149.1
  • User-customized pulse shapes
  • Very low power
  • No external component changes for 120 Ohms/75 Ohms operation
  • Package: 144-pin LQFP, or 160 BGA

    Documentation on this CD requires Adobe Acrobat Reader. Download the latest viewer.
    Copyright © 2002 Cirrus Logic Inc.