74hc series logic texas instruments sn74hc74n the texas instruments 74hc74n dual d type flip flop with preset and clr is available in a so 14 package it has full function and pin compatibility with lsttl family and most types of the cmos 4000 family it features very short switching times and a fan out of 10 lsttl loads texas instruments sn74hc74n logic dual d type flip flop dip14