The 'F109 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 'F74 data sheet) by connecting the J and K# inputs.

Asynchronous Inputs:

LOW input to S#_D sets Q to HIGH level

LOW input to C#_D sets Q to LOW level

Clear and Set are independent of clock

Simultaneous LOW on C#_D and S#_D makes both Q and Q#

HIGH