The Delay25 is a 5 channel CMOS programmable delay line featuring 4 channels that allow to phase delay periodic or non-periodic digital signals and a master channel that can be used to phase delay a clock signal. The master channel serves as a calibration reference. The phase of each channel can be independently programmed with a resolution of 0.5 ns through an I2C interface. The reference clock frequency can be any of the following: 32, 40, 64 or 80 MHz.