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