Traditional HCSL outputs steer a constant 15mA current between true and complement outputs of a differential pair. This results
in a continuous power consumption of ~50mW from 3.3V for each differential HCSL output pair.
Low Power HCSL uses a push-pull voltage drive as opposed to current drive with traditional HCSL. This results in a current
consumption of approximately 4 to 5mA. Supply current flows in the driver only during the time a rising edge is traveling from the
driver to the end target and then back to the driver (round trip flight time).
Low Power HCSL not only reduces power significantly, it also better drives long traces, saves board area, reduces BOM costs,
and more easily drives AC-coupled transmission lines. This makes Low Power HCSL the choice for future designs.
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AN-879 Low-Power HCSL vs Traditional HCSL アプリケーションノート PDF 235 KB