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GTL Background Information GTL was approved as JEDEC standard JESD 8-3 in 1993 and originally was created as a reduced-swing l/0 driver technology to support high-speed buses and backplanes. The GTL bus is designed to work with low voltage swings. The input buffer works like an analog comparator rather than like an inverter, which allows the GTL inputs to switch quickly without needing to be driven rail to rail. GTL drivers were designed to pull a l.2-V signal down t0 0.4 V when switched on. This, however, placed the reference voltage for the input comparator at 0.8 V, which made it susceptible to ground-bounce noise. A variant of GTL, called GTL+, is being used to address this noise-margin concern. The GTL+ termination voltage is raised t0 1.5 V, with the driver pulling down to a VOL of 0.5 V. This moved the reference voltage t0 1 V and out of the range of most ground bounces.