CDR Unit

The VSC8115, a 3.3 V clock and data recovery (CDR) unit, operates at OC-12/STS-12/STM-4 (622 Mb/s) or OC-3/STS-3/STM-1 (155 Mb/s) for terminal multiplexer, add/drop multiplexers, cross connects, Wavelength Division Multiplexing (WDM), analog, ATM, and IP systems. This third-generation integrated circuit (IC) meets ANSI, Bellcore, and ITU-T specifications for jitter performance, with the lowest power dissipation (130mW typical) available today.

The high input sensitivity of the unit, along with its ability to retime data at the output, provides design engineers a solution for maximizing data coherency. Data that is propagated over long lengths of fiber or traversed through multiple stages of a switch fabric results in signal degradation. The CDR maintains data integrity by reshaping the signal using its recovered, low jitter clock.

The high-speed clock and data outputs support multiple I/O types adding flexibility for the design engineer. The outputs can be terminated as LVDS differential outputs by placing a 100-ohm register between the differential signals, or they can be terminated as LVPECL differential outputs. The unit isackaged in a board space saving 20 pin TSSOP.

Vitesse Semiconductor, 741 Calle Plano, Camarillo, CA 93012 Phone: 805-388-3700 Fax: 805-987-5896