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If I understand correctly, this trigger is an inverter, so a high input results in a low output. If the input is at 0V, I expect to get a high output. As my input slowly increases from 0V up to 4.5V, what is the lowest voltage that may cause the trigger to begin outputting a low output? And what is this value denoted as in the product spec? The LTC1655/LTC1655L are rail-to-rail voltage output, 16-bit digital-to-analog converters in an SO-8 package. They include an output buffer and a reference. The 3-wire serial interface is compatible with SPI/QSPI and MICROWIRE protocols. The CLK input has a Schmitt trigger that allows direct optocoupler interface.