The Harris CD74HC374, CD74HCT374, CD74HC574 and CD74HCT574 are Octal D-Type Flip-Flops with Three-State Outputs and the capability to drive 15 LSTTL loads. The eight edge-triggered flip-flops enter data into their registers on the LOW to HIGH transition of clock (CP). The Output Enable (OE) controls the three-state outputs and is independent of the register operation. When Output Enable (OE) is HIGH the outputs will be in the high impedance state. The 374 and 574 are identical in function and differ only in their pinout arrangements.