JPS5918746Y2 - Retrigger multivibrator - Google Patents

Description

[Detailed description of the invention] This invention relates to an improved structure of a retrigger mono-multivibrator using a gate, and the structure of the above vibrator is complicated. The purpose is to form the motion stably without causing any damage.

Hereinafter, embodiments of the present invention will be described in detail based on the accompanying drawings.

In Figure 1, 1 is a first circuit using a two-man NAND circuit.
gate, 2 is the second gate using a three-person NAND circuit,
3 is a flip-flop circuit formed by the first gate and the second gate; 4 is a differentiation circuit connected to one input of the first gate; 5, 6, and 7 are capacitors forming the differentiation circuit 4; 8 9 is the trigger input connected to the differentiating circuit 4, 9 is the clear input connected to one input of the second gate 2, and 10 is the trigger input connected to the differentiating circuit 4.
is a third gate using a two-man power AND circuit connected to the output of the first gate 1, 11 is a trigger input connected to one input of the third gate 10, and 12 is an integral gate connected to the output of the third gate 10. 13 and 14 are resistors and capacitors forming the integrating circuit 12, 15 is a protective resistor connected to the output of the integrating circuit 12, 16 is an input to the resistor 15, and an output is connected to another input of the second gate 2. A fourth gate 17 consisting of an inverter connected to the output of the third gate NO and the input of the fourth gate 16 is connected to the integrator circuit 12.
diodes forming a discharge circuit are shown.

The operation of the above configuration will be explained with reference to FIG.

When the signal to the trigger input 8 changes from H to L as shown in Fig. 2A, the second signal differentiated by the capacitor 5 and resistors 6 and 7
The waveform shown in Figure B is applied to the input of the first gate 1, and accordingly the flip-flop circuit 3 formed together with the second gate 2 is triggered, and the Q and Q of the first and second gates 1 and 2 are triggered.
The output is inverted, and the Q output changes from L to H, and the Q output changes from H to L, as shown in FIG. 2, C and D.

The above-mentioned inversion operation applies the above-mentioned Q output to the input of the third gate 10.

In this case, if the human power state to the Ridotsuga manpower 11 is L as shown in FIG. 2E, the output state of the third gate 10 is maintained at L as shown in FIG. The Q output of 1 remains high as shown in FIG. 2C.

Next, as shown in FIG. 2E, if the lidotsuga human power 11 is inverted from L to H, the output of the third gate 10 is inverted from L to H as shown in FIG. The capacitor 14 is charged through the resistor 13, and after T seconds, the threshold voltage VTR of the fourth gate 16 formed by an inverter is applied to the connection point between the resistor 13 and the capacitor 14.
is reached at G in Figure 2.

Then, the output of the fourth gate 16 is inverted from H to L, and this output signal inverts the flip-flop circuit 3.

That is, the Q output of the first gate 1 becomes L, and at the same time, the output of the third gate 10 also becomes L.

Accordingly, the charge in the capacitor 14 of the integrating circuit 12 is transferred to the resistor 15, the diode 17, and the third gate 1.
0 quickly discharges through the output of resistor 1 of the integrator circuit 12.
3 and the capacitor 14 is lower than the threshold voltage VTR of the fourth gate 16, and its output is as shown in FIG.
As shown in FIG.

Furthermore, if a pulse signal is applied to the trigger input 8 when the input state of the retrigger input 11 is H, the flip-flop circuit 3
The Q output of the first gate of is inverted from L to H, and at the same time the Q output of the third gate of
The output of the gate 10 is inverted from L to H and charges the capacitor 14 through the resistor 13 of the integrating circuit 12.

In this way, due to the rise in the node voltage of the resistor 13 and the capacitor 14, the Q output of the first gate 1 is inverted from H to L after T seconds by the same operation as described above.

In addition, the flip-flop circuit 3 is in a quasi-stable state, and the Q output of the first gate 1 is H and the Q output of the second gate 2 is L.
At this time, by applying an L signal to the clear manual power 9, the clear state is forcibly returned to a stable state, and the Q output is inverted to L and the Q output is inverted to H.

That is, in the present invention, the Schmitt characteristic of the flip-flop circuit 3 formed by the first gate 1 and the second gate 2 makes it possible to stably control the subsequent stage circuit without generating a chattering waveform in its output. In addition to the trigger input 8, the flip-flop circuit 3 can be equipped with a clear manual input 9, for example, by connecting the clear manual input 9 to a power source (not shown) and applying an L signal only at the initial stage of power-on. It is also possible to avoid triggering the retrigger mono-multivibrator due to the closing operation.

Also, 1st. 2. 3. 4 gates 1. 2.10.
When 16 is constituted by a CMOS gate, the pulse width of the vibrator can be arbitrarily set within a wide range.

That is, when the input state of the retrigger input 11 is H and a pulse signal is applied to the trigger input 8, or when the input state of the retrigger input 11 is L and a pulse signal is applied to the trigger input 8, then the retrigger input 11 is set to H. The factors that determine the pulse width of the vibrator when reversed are the values of the resistor 13 and capacitor 14 of the integrating circuit 12, and the value of the resistor 13 is selected to be larger than the resistor that causes the output current of the first gate 1 to be excessive. Therefore, it is theoretically possible to use up to an infinite resistance value.

Therefore, the above game) 1. 2.10.16 and the integration circuit 12 can be easily combined to economically form a high-performance, full-scale retrigger mono-multivibrator with 8 trigger inputs, 9 clear manual inputs, 11 retrigger manual inputs, and ゛Q output/output. can do.

As detailed above, the present invention forms a flip-flop circuit by connecting the inputs and outputs of a first gate with two-terminal input and a second gate with three-terminal input, and connects the other inputs of the first gate. The other input of the second gate is used as a trigger input, the other input of the second gate is used as a clear input, and the output of the first gate is connected to one input of a third gate that performs an AND operation to retrigger the other input of this third gate. The output of the third gate is connected to a fourth gate that performs an inverting operation at a predetermined input level via an integrating circuit, and the output of the fourth gate is connected to the other input of the second gate. As a result, it is possible to provide a multifunctional retrigger mono-multivibrator with a simple circuit configuration and manual trigger, retrigger, and clear functions at a low cost.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram showing one embodiment of the present invention, and Fig. 2 is a circuit diagram showing an embodiment of the present invention.
It is a characteristic diagram of each part. First gate 1, second gate 2, flip-flop circuit 3
, trigger input 8, clear manual power 9, third gate 10, retrigger manual power 11. Integrating circuit 12, 4th gate 16°

Claims (1)

[Scope of utility model registration request] A flip-flop circuit is formed by connecting the inputs and outputs of a first gate with two-terminal input and a second gate with three-terminal input, and the other input of the first gate is used as a trigger input,
The other input of the second gate is used as a clear input, and the first
The output of the gate is connected to one input of a third gate that performs an AND operation, and the other input of this third gate is used as a retrigger input, and the output of the third gate is inverted at a predetermined input level via an integrating circuit. The retrigger multivibrator is connected to a fourth gate that operates, and further connects the output of the fourth gate to another input of the second gate.