DS42MB200

DS42MB200 Dual 4.25 Gbps 2:1/1:2 CML Mux/Buffer with Transmit Pre-Emphasis and Receive Equalization December 7, 2007 DS42MB200 Dual 4.25 Gbps 2:1/1:2 CML Mux/Buffer with Transmit PreEmphasis and Receive Equalization General Description The DS42MB200 is a dual signal conditioning 2:1 multiplexer and 1:2 fan-out buffer designed for use in backplane redundancy applications. Signal conditioning features include input equalization and programmable output pre-emphasis that enable data communication in FR4 backplanes up to 4.25 Gbps. Each input stage has a fixed equalizer to reduce ISI distortion from board traces. All output drivers have 4 selectable steps of pre-emphasis to compensate for transmission losses from long FR4 backplanes and reduce deterministic jitter. The pre-emphasis levels can be independently controlled for the line-side and switch-side drivers. The internal loopback paths from switchside input to switch-side output enable at-speed system testing. All receiver inputs and driver outputs are internally terminated with 100Ω differential terminating resistors. Features ■ ■ ■ ■ ■ ■ ■ ■ ■ 1– 4.25 Gbps fully differential data paths Fixed input equalization Programmable output pre-emphasis Independent switch and line side pre-emphasis controls Programmable switch-side loopback mode On-chip terminations +3.3V supply ESD rating HBM 6 kV Lead-less LLP-48 package (7mmx7mmx0.8mm, 0.5mm pitch) ■ –40°C to +85°C operating temperature range Applications ■ Backplane driver or c...