This part is a kind of semiconductor called 74LS74.

Function of this product has Dual Positive-Edge-Triggered D Flip-Flops with Preset/ Clear and Complementary Outputs.

Manufacturers : National Semiconductor

Image and pinout :

Some of the text within the PDF file :

54LS74 DM54LS74A DM74LS74A Dual Positive-Edge-Triggered D Flip-Flops with Preset Clear and Complementary Outputs June 1989 54LS74 DM54LS74A DM74LS74A Dual Positive-Edge-Triggered D Flip-Flops with Preset Clear and Complementary Outputs General Description This device contains two independent positive-edge-triggered D flip-flops with complementary outputs The information on the D input is accepted by the flip-flops on the positive going edge of the clock pulse The triggering occurs at a voltage level and is not directly related to the transition time of the rising edge of the clock The data on the D input may be changed while the clock is low or high without affecting the outputs as long as the data setup and hold times are not violated A low logic level on the preset or clear inputs will [ ... ]

74LS74 PDF Datasheet Download