SU363216A1 - REVERSIBLE RING COUNTER - Google Patents

Description

one

The invention can be used in automation and computing.

Known reverse ring counters, containing triggers with additional symmetry on transistors of different conductivity types, in which the bases of transistors are connected respectively to the middle points of two series-connected collector resistors of transistors of opposite types of conductivity, and the collector of the transistor of the same type of conductivity of each trigger is connected through a capacitor to the base of a single transistor adjacent cell to the right.

However, such reversible ring meters are characterized by low speed and the impossibility of directly controlling the meter for the next decade.

The proposed reversible ring counter differs from the known ones in that the collector of a transistor of a different conductivity type of each trigger is connected to the base of the same type transistor of the adjacent trigger to the left.

This allows the functionality of the counter to be expanded.

A schematic diagram of the reversible ring counter is shown in the drawing.

The circuit contains triggers with additional symmetry on transistors 1 and 2 of different conductivity types and resistors 3, reverse circuit 4, resistors 5 and 6, counting input 7, a differentiating circuit on capacitor 6 and resistor 9, transistor 10, interstage link capacitors 11 and 12 .

In the initial state, one of the counter triggers is in the "on" state and its transistors / and 2 are open, the transistors of the other triggers are closed. Depending on the state of the reverse emitter circuit 4, the transistor bus of one type is connected to the power supply source via an emitter resistor, and the emitter type of the other transistors is connected via the public key of the reverse circuit. An unlocking voltage acts between the points of connection to the source of supply voltages of the base circuits and an emitter resistor, and a blocking voltage acts between the points of connection of the base circuits and the transistor switch.

Assume that under this condition of the reverse 4 emitter circuit of the transistors / connected to the source of supply voltages through a resistor 5. Then the emitter bus of transistors 2 will be connected to the source of the supply voltages through the open key of the reverse circuit 4. As a result, the transistor / will be close to saturation.

transistor 2 is in saturation. In the remaining cells, the transistors / will be locked by the voltage that is formed on the resistor 5 by the current of the transistor / switched on cell, and the transistors 2 by the voltage specified in their base from the power supply source. A start pulse appearing at input 7 through a differentiating circuit on a capacitor 8 and a resistor 9 and a transistor 10 enters the emitter plate of transistors / and closes the open transistor. The voltage jump from the collector of the locked transistor 1 through the capacitor 11 enters the base of the transistor / adjacent trigger on the right. At the same time, the transistor, to the base of which the voltage jump arrived, remains closed by a start pulse, having the same amplitude and polarity as the voltage jump.

In the trigger with the closed transistor 1, the transistor 2 is also closed after exiting from the saturation. The voltage drop across the collector of the latter through the capacitor 12 is transmitted to the base of the transistor 2 of the adjacent trigger on the left and opens it. By the time when the transistor 2 of the previously activated trigger goes to cut-off mode, the transistor 2 in the subsequent trigger appears in saturation. By this time, the recharging of the capacitor 11 in the collector circuit of the transistor / previously activated trigger is completed. Therefore, when the start pulse decays, the trigger with the opened transistor 2 changes to the "on" state. As a result, the on state is moved one digit to the left. When the next start pulse arrives, the process repeats.

The reverse is carried out by applying a pulse to a: (one of the reversal circuit 4 in the interval between the starting pulses. In this case, the reverse circuit 4 changes its state, as a result of which

the emitter bus of the transistors / turns out to be connected to the source of supply voltages through the public key of the reverse, and the emitter bus of the transistors 2 through the resistor 6. As a result, in the

the trigger transistor 1 enters saturation, and transistor 2 is brought out of saturation. When a start pulse appears on the counting input 7 locked by a start pulse for the time when the previously activated trigger is turned off

There are transistors 2, as a result of which the shift occurs in the direction determined by the action of the interstage connection of the transistors /, i.e., from left to right.

Subject invention

Reversible ring counter containing triggers with additional symmetry on transistors of different conductivity types,

in which the bases of transistors are connected respectively to the middle points of two series-connected collector resistors of transistors of opposite conduction types, the collector of the transistor is one

the conductivity type of each trigger is connected through a capacitor to the base of a transistor of the same type on the right side of the cell, characterized in that, in order to expand its functionality, the collector

A transistor of a different type of conductivity of each trigger is connected to the base of a transistor of the same type of an adjacent trigger on the left.