SU1328936A1 - Device for shaping unblocking pulse - Google Patents

Abstract

The invention can be used in computing devices, where when power is turned on, installation of memory elements IB requires a certain state. The purpose of the invention is to increase the speed of the device when the power source is turned on again. The device contains a capacitor 1, a threshold element 2 and a resistor 3. A D-flip-flop 4, resistors 5 and 6, keys 7-10 are entered into the device and new functional connections are formed. 1 il. t Enum (L 00 th with co Stock 05

Description

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The invention relates to a pulse technique and can be used in computing devices, where when power is turned on, the installation of memory elements in a certain state is required.

The purpose of the invention is to increase the speed of the device when the power source is turned on again.

The drawing shows a schematic diagram of the devices.

The installation pulse shaping device comprises a capacitor 1 whose first terminal is connected to the common bus, and the second is connected to the input of the threshold element 2 and is connected to the power supply bus through the first resistor 3.

The device contains a D-flip-flop 4, a second 5 and a third 6 resistors, the first 7, the second 8, the third 9 "fourth 1-0 keys, the output of the threshold element is connected to the C-input of the trigger, and the input is connected to the output of the first key 7 and The first input of the second key 8 is the inputs of the first 7, second 8 and third 9 keys connected to the common bus, the output of the fourth key 10 is connected to the input of the S-flip-flop and connected via the second resistor 5 to the common bus, the control inputs of the first, third and fourth keys are connected with direct trigger output, the D-input of which is connected to the bus ist chnika power and R-input is connected to the outputs of the second and third keys to 6 through a third resistor to the power source bus, the fourth key input is connected with bus power source.

The device works as follows.

After supplying power to the device, the capacitor 1 begins to charge from the power source through a resistor 6. The resistance of the resistor is 6 n and the capacitance of the capacitor 1 determines the time constant of the charge circuit of the capacitor 1 and the pulse width of the installation. Until the threshold element is triggered, the direct output of trigger 4 has a logic level O, the inverse output has logic level 1, the initial state of trigger 4 is fixed at inputs R and S, because the input R of trigger 4 is connected to the power supply bus, and input S of trigger 4 through resistor 5 has

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logic level O. When the voltage across the capacitor 1 reaches the voltage threshold of the threshold of the element, the output of the threshold element 2 is fixed to the level of logic I, the key 8 opens, and the trigger 4 switches to the opposite state. At the output of the two devices, the logical level is set. Whom Oh, Logic logical 1 from the direct output of the trigger 4 opens the keys 9 and 10, At the input R of the trigger 4

logic level O appears, g input S of trigger 4 through open

the key 10 is locked to the logic level 1. The signals at the inputs R and S fgasse the new state of trigger 4, while the output of the device is fixed jg logic level O. Starting from this moment, the capacitor I is reset through the public key 7, After zeroing the capacitor, the device is ready for the next power source.

Thus, resetting the capacitor 1 occurs immediately after switching on the power source and the time required to prepare the device for re-switching 2Q is not required.

Claims (1)

Invention Formula v, j- A device for forming an installation pulse containing a capacitor, the first output of which is connected to the common bus, and the second is connected to the input of the threshold element and through 40, the first resistor is connected to the power supply bus, characterized in that, in order to increase speed, a D-flip-flop, two resistors and four g of the key, the output of the threshold element is connected to the C-input of the trigger, and the input is connected to the output of the first key and the control input of the second key, the inputs of the first, second and third The gQ keys are connected to the common bus, the output of the fourth key is connected to the S-flip-flop input and through the second resistor is connected to the common bus, the control inputs of the first, third The gg and fourth keys are connected to the forward output of the trigger, the D input of which is connected to the power supply bus, and the R input is connected to the outputs of the second and third keys and 313289364 The third resistor to the source bus is connected to the power supply bus, the input of the fourth key.