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CML = Current Mode Logic
Rail to rail: typically to describe the voltage can swing to the highest supply voltage (for example, Vdd) to lowest supply voltage (for example, ground)
CML implies differential and reduced voltage swings. It's one of several high speed differential digital styles/interfaces.
Check out below for more info.
**broken link removed**
Rail to rail in this context describe your "standard" digital circuit / interfaces - ie. CMOS, in that the signal goes between the power and ground rails.
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