74hc series logic texas instruments sn74hc374n this texas instruments 74hc374 tristate octal d type flip flop ic is available in a dil 20 package a part of the 74hc range the m74hc374 is a high speed cmos octal d type flip flop with 3 state outputs non inverting texas instruments sn74hc374n tri state octal d type flip flop