74LS Series – Texas Instruments SN74LS74AN, This is the Texas Instruments SN74LS74AN dual d-type positive edge triggered flip-flop IC from the 74LS family. This is part of a range of low power Schottky devices offering the same speed as standard TTL but at a fifth of the power consumption. Texas Instruments SN74LS74AN Dual D-Type Positive Edge Triggered Flip-Flop DIP14