The MN3870S is a 4 fSC CMOS CCD comb filter with a built-in 4 fSC CMOS CCD signal delay element for video signal processing applications. It contains such components as a fourfold-frequency circuit, a shift register clock driver, a CCD analog shift register switchable between 911, 1 and 908 / 906 stages, and a resampling output amplifier. It samples the input using the supplied clock signal with a frequency of four times the color signal subcarrier frequency (3.58 MHz) and subtracts between the 911- and 1-stage CCD output signals to produce the color signal comb characteristics for the NTSC system. It also uses this fourfold frequency to drive a 908- or 906-stage CCD and samples the input to produce, after adding in the attached filter delay, a delay of 1 H (the horizontal scan period) when the SW pin is left open.