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Asynchronous counter constructed from JK flip flops. An asynchronous (ripple) counter is a "chain" of toggle (T) flip-flops in which the least-significant flip-flop (bit 0) is clocked by an external signal (the counter input clock), and all other flip-flops are clocked by the output of the nearest, less significant flip-flop (e.g., bit 0 clocks ...
The JK flip-flop, augments the behavior of the SR flip-flop (J: Set, K: Reset) by interpreting the J = K = 1 condition as a "flip" or toggle command. Specifically, the combination J = 1, K = 0 is a command to set the flip-flop; the combination J = 0, K = 1 is a command to reset the flip-flop; and the combination J = K = 1 is a command to toggle ...
Flip-Flops 2 Dual J-K master-slave flip-flop, Q & Q outputs, positive-edge trigger, asynchronous set and reset 16 RCA, TI: 4028 Multiplexers 1 4-bit BCD to 10-output decoder (can be used as 3-bit binary to 8-output decoder), active HIGH output 16 RCA, TI: 4029 Counters 1 Presettable up/down counter, binary or BCD-decade 16 RCA, TI: 4030 Logic ...
dual J-K negative-edge-triggered flip-flop, clear 14 SN74H103: 74x104 1 J-K master-slave flip-flop 14 SN74104: 74x105 1 J-K master-slave flip-flop, J2 and K2 inverted 14 SN74105: 74x106 2 dual J-K negative-edge-triggered flip-flop, preset and clear 16 SN74H106: 74x107 2 dual J-K flip-flop, clear 14 SN74LS107A: 74x108 2
The 7400 series contains hundreds of devices that provide everything from basic logic gates, flip-flops, and counters, to special purpose bus transceivers and arithmetic logic units (ALU). Specific functions are described in a list of 7400 series integrated circuits. Some TTL logic parts were made with an extended military-specification ...
Asynchronous circuits and theory surrounding is a part of several steps in integrated circuit design, a field of digital electronics engineering. Asynchronous circuits are contrasted with synchronous circuits, in which changes to the signal values in the circuit are triggered by repetitive pulses called a clock signal. Most digital devices ...
At each advance, the bit on the far left (i.e. "data in") is shifted into the first flip-flop's output. The bit on the far right (i.e. "data out") is shifted out and lost. The data is stored after each flip-flop on the "Q" output, so there are four storage "slots" available in this arrangement, hence it is a 4-bit register.
This interface is inherently asynchronous and must be analyzed as such. Examples of widely used asynchronous circuits include synchronizer flip-flops, switch debouncers and arbiters. Asynchronous logic components can be hard to design because all possible states, in all possible timings must be considered.