Nxp 74hc series logic devices nxp 74hc574d 652 the 74hct574d are octal d type flip flops featuring separate d type inputs for each flip flop and 3 state outputs for bus oriented applications a clock cp and an output enable oe input are common to all flip flops the 8 flip flops will store the state of their individual d inputs that meet the set up and hold times requirements on the low to high cp transition when oe is low the contents of the 8 flip flops are available at the outputs wh