The MC74AC109/74ACT109 consists of two high-speed completely independent transition clocked JK flip-flops. The clocking operation is independent of rise and fall times of the clock waveform. The JK design allows operation as a D flip-flop (refer to MC74AC74/74ACT74 data sheet) by connecting the J and K inputs together.
   
Asynchronous Inputs:
    LOW input to SD (Set) sets Q to HIGH level
    LOW input to CD (Clear) sets Q to LOW level
    Clear and Set are independent of clock
    Simultaneous LOW on CD and SD makes both Q and Q HIGH

• Outputs Source/Sink 24 mA
• ′ACT109 Has TTL Compatible Inputs