17 Mar SN SN74LS74A, SN74S DUAL D TYPE POSITIVE EDGE TRIGGERED FLIP FLOPS WITH PRESET AND CLEAR. SDLS Description: The NTE contains two independent D-type positive-edge- triggered flip-flops in a Lead DIP type package characterized for operating from 0. SN datasheet, SN circuit, SN data sheet: TI DUAL D-TYPE POSITIVE-EDGE-TRIGGERED FLIP-FLOPS WITH PRESET AND CLEAR.