This document discusses the DS91M125 125 MHz 1:4 M-LVDS repeater from National Semiconductor. It provides an overview of the device, including its logic diagram, features, applications, and comparison of key parameters. The repeater is designed to drive and distribute clock or data signals from a single LVDS input across four M-LVDS outputs. It can be used for applications such as clock distribution in ATCA and uTCA backplanes and multidrop/multipoint clock and data distribution networks.