JK trigger. Scheme, description

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JK trigger. Radio - for beginners

Radio - for beginners

In the K155 series, the JK flip-flop, which, like the D-flip-flop, has extended action logic, is the K155TV1 chip (Fig. 1, a). This type of trigger has nine inputs, direct and inverse outputs. On the R and S inputs, it works like an RS flip-flop. Inputs J and K are control inputs, each of them has three input outputs (3, 4, 5 and 9, 10, 11), combined according to the 3I logic element circuit, as evidenced by the "&" signs next to them.

Input C is functionally similar to the input of the D-flip-flop of the same name. In the mode of receiving and storing information, it serves as the input of clock pulses, and in the counting mode, it serves as an information input. The conclusions of the JK flip-flop, which are not involved in the operation of the device, are usually not shown in the diagrams (Fig. 1, b).

Fig 1. JK flip-flop K155TV1

Experienced, check the JK-flip-flop on the breadboard in this order. Connect the K155TV1 chip to the corresponding power wires, and connect LED or transistor indicators to pin 12 (to input C) and pins 8 and 6 (to direct and inverse outputs), as shown in fig. 2, a. Of course, you can also indicate the logical states of the trigger with a DC voltmeter, but this is less obvious.

JK flip-flop
Rice. 2 Experience with JK trigger

Turn on the power. One of the output indicators should turn on immediately. Short-circuit the R input to the common wire, then the S input, then R again, etc. In this case, the output indicators should alternately light up and go out. So you check the performance of the JK flip-flop.

Next, test the trigger in the input pulse counting mode. To do this, combine all inputs J and K and through the resistor R4 shown in fig. 2, but with dashed lines, connect them to the positive power wire to apply a high level voltage to them (however, as you already know, the resistor R4 is optional - at the combined J and K inputs, if left free, there will be a high level voltage).

Apply a series of long-duration pulses from the generator to input C and, based on the moments of ignition and the duration of the indicator glow, plot graphs of the trigger in this mode. They should be the same as in Fig. 2b. It is easy to see that these graphs are similar to those of a counting D-flip-flop, only they are shifted to the right by the duration of one pulse. This shift is explained by the fact that the D-flip-flop changes its state to the opposite by a positive drop, and the JK flip-flop - by a negative voltage drop. The end result is the same: the flip-flop divides the frequency of the input pulses by 2.

Remember the basic properties of a JK flip-flop. With a high level voltage at all inputs J and K, it works as a trigger with a counting input, i.e., on the decline of each high-level pulse at the clock input C, it changes its logical state to the opposite. If at least one input J and one input K simultaneously have a low-level voltage, then when pulses are applied to input C, the state of the trigger does not change.

In the same case, if all inputs J have a high voltage level, and at least one input K is low, then the trigger is set to a single state by the decay of the high-level pulse at input C, regardless of its previous state. If at least one input J has a low voltage level, and all inputs K have a high voltage level, then the trigger is set to the zero state by the decay of the pulse at input C.

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