JPH05327460A - Input circuit device - Google Patents

Abstract

PURPOSE:To improve the degree of integration and to reduce the production cost of an input circuit device by providing a 2nd resistance between an input protecting circuit and a driver circuit in order to perform the conversion of voltage between the signals of different voltage levels. CONSTITUTION:Two diodes D1 and D2 are connected in series between a 1st power supply (power voltage VDD1) and the earth, and one of both ends of a 1st resistance R1 is connected between both diodes D1 and D2 of an input protecting circuit 10. When an input signal is inputted between both diodes D1 and D2, this signal undergoes the division of voltage by the resistance R1 and a 2nd resistance R2 included in te circuit 10 and is inputted to a driver circuit 11. Then, a signal having the same level of as the voltage of a 2nd power supply (power voltage VDD2) is outputted from the circuit 11. As a result, the signal having the same level as the VDD1 is converted into the signal having the same level as the VDD2 with no special circuit required.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a MIS semiconductor integrated circuit device (metel insulator semiconductor).
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an input circuit of a semiconductor integrated circuit such as an n.

[0002]

2. Description of the Related Art In recent semiconductor integrated circuits such as MIS semiconductor integrated circuits, the miniaturization of LSIs has been developed along with the demand for higher integrated circuits, and the development of low voltage LSIs has also been advanced. In such a current situation, for example, two power supply system chip circuits, for example, a 5V operation system chip circuit and a 3V operation system chip circuit may coexist in an LSI system. In order to match the signal level (voltage level) of the SSI (smallscale), a voltage conversion circuit capable of converting the voltage level is provided.
le integration) or MSI (medi)
It has been necessary to provide it on a semiconductor integrated circuit by the um scale circuit. FIG. 5 specifically shows this state. In FIG. 5, 50 and 54 are 5V
Operating system circuits, 51 and 53 are voltage conversion circuits composed of SSI and MSI, and 52 is a 3V (3.3V) operating circuit (LSI).
Is. Next, FIG. 6 is a circuit diagram showing an input circuit generally used in a conventional MIS semiconductor integrated circuit device. In FIG. 6, 10 is an input protection circuit composed of diodes D1 and D2 and a resistor R1, 11 is a driver circuit composed of two stages of inverters, and VDD1 is a power supply voltage.

Next, the operation of this conventional example will be described. When a signal of "H" voltage level is input to the input terminal (in) of the input protection circuit I0, this signal is output to the output terminal (out) via the driver circuit 11. At this time, in the driver circuit 11, since the upper inverter (comprising a P-channel transistor) forming this circuit is turned on, a signal at the voltage level of the power supply voltage VDD1 is output. Similarly, when a signal of "L" voltage level is input to the input terminal (in) of the input protection circuit 10, the output terminal (out) of the driver circuit 11 is at the ground level "L". "Signal is output. Therefore, in order to output a signal from this driver circuit to a circuit having a power supply voltage different from the power supply voltage VDD1, the voltage conversion circuits 51 and 53 as shown in FIG. 5 are required.

[0004]

Since the input circuit of the conventional MIS semiconductor integrated circuit is configured as described above, even when signals are exchanged between circuits having different power supply voltages, different power supply voltages are used. When the LSI circuit is used in the system, it is necessary to provide the voltage conversion circuits 51 and 53 shown in FIG. 5 between the external circuit and the LSI circuit in order to match the voltage level signals. Therefore, there is a problem that the integration degree in the system of the semiconductor integrated circuit is lowered and the manufacturing cost is increased.

The present invention has been made in order to solve the above problems, and an input capable of voltage conversion of a signal between circuits having different power supply voltages without providing a special circuit such as a voltage conversion circuit. An object is to provide a circuit device.

[0006]

In the input circuit device according to the first aspect of the present invention, as shown in FIG. 1, a series-connected two circuit connected between a first power source (power source voltage VDD1) and ground. A plurality of diodes D1 and D2, and a first resistor (resistor R1) having one end connected between the diodes, an input signal is input between the diodes, and an output signal is the first resistor. Input protection circuit 10 sent from the other end of
And a driver circuit (driver circuit 11) for driving the driven circuit by voltage, the first circuit device comprising:
Is provided between a second power supply (power supply voltage VDD2) that supplies a voltage lower than the voltage of the power supply to the driver circuit and the output side of the input protection circuit and the ground, and outputs the output signal of the input protection circuit. A second resistor (resistor R2) for converting the output signal into a signal having the same voltage level as the voltage of the second power source by dividing the voltage with the first resistor and outputting the voltage to the driver circuit. It has and.

In the input circuit device according to the second invention,
As shown in FIG. 3, two series-connected diodes connected between a first power supply (power supply voltage VDD1) and ground, and a first resistor (resistance R1), an input signal is input between the both diodes, and an output signal is sent from the other end of the first resistor, and an input protection circuit for driving the driven circuit by voltage. An input circuit device including (driver circuit 10), a second power supply (power supply voltage VDD2) that supplies a voltage lower than the voltage of the first power supply to the first driver circuit, and the first power supply. And a ground, and a second driver circuit (driver circuit 1 that outputs the output signal of the input protection circuit to the first driver circuit).
2) and the output signal of the second driver circuit, which is provided between the output side of the second driver circuit and the ground, and divides the output signal of the second driver circuit by the internal resistance when the second driver circuit is in the ON state. Output to the first driver circuit to convert the output signal into a signal having the same voltage level as the voltage of the second power supply.
2) and are provided.

In the input circuit device according to the third invention,
As shown in FIG. 4, two diodes connected in series connected between a first power supply (power supply voltage VDD1) and ground, and a first resistor (resistor having one end connected between the two diodes) are connected. R1), an input signal is input between both the diodes, and an output signal is sent from the other end of the first resistor, and the input protection circuit is connected between the first power supply and the ground. And a driver circuit (driver circuit 10) for driving the driven circuit (internal circuit 40) with a voltage, the second circuit supplying a voltage lower than the voltage of the first power source to the driven circuit. Is provided between the power source of the driver circuit and the output side of the driver circuit and the ground, and the output signal of the driver circuit is divided by the internal resistance when the driver circuit is in the ON state and output to the driven circuit. By doing so, Signal and a second resistor (resistance R2) for voltage conversion into signals having the same voltage level as the voltage of the second power supply.

[0009]

In the input circuit device according to the first aspect of the present invention, when an input signal is input between the diodes D1 and D2 of the input protection circuit 10, the first resistance (resistance R
The voltage is divided by 1) and the second resistor (resistor R2) and input to the driver circuit 11. Then, this driver circuit outputs a signal having the same voltage level as the voltage of the second power supply (power supply voltage VDD2). As a result, a signal having the same voltage level as the voltage of the first power supply is converted into a signal having the same voltage level as the voltage of the second power supply without using a special circuit.

In the input circuit device according to the second invention,
The input signal input to the input protection circuit 10 is input to the first driver circuit (driver circuit 11) via the second driver circuit (driver circuit 12). The second resistor (resistor R2) is provided between the first and second driver circuits. An input signal of a small voltage level input through the input protection circuit 10 is output as a signal having the same level as the voltage of the first power supply by the second driver circuit, and the second driver circuit is in the ON state. The voltage is divided by the internal resistance and the second resistance (resistor R2), and is output as a signal having the same voltage level as the voltage of the second power supply by the first driver circuit. As a result, unlike the first aspect of the invention, voltage conversion is performed between signals having different voltage levels without using a special circuit.

In the input circuit device according to the third invention,
The output signal of the driver circuit 11 is divided by the internal resistance of the driver circuit and the second resistance (resistor R2) and voltage-driven by the second power supply (power supply voltage VDD2). ) Is entered. As a result, similarly to the above, voltage conversion is performed between signals having different voltage levels without using a special circuit.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment (embodiment 1) of the first invention.
3 is a circuit diagram of the input circuit device showing FIG. In FIG. 1, 1
0 is an input protection circuit composed of a resistor R1 as a first resistor and two diodes, R2 is a resistor as a second resistor, VDD1 is a power supply voltage as a first power supply, VDD
2 is a power supply voltage as a second power supply, and 11 is a driver circuit. In addition, the same reference numerals are given to portions having the same functions as those of the conventional example (FIG. 6). In the input protection circuit 10, two diodes D1 and D2 are connected in series in the same direction, the cathode of the diode D1 is connected to the power supply voltage VDD1, and the anode of the diode D2 is connected to the ground. The resistor R1 has one end connected to the input terminal (in) via a connection point of these diodes, and the other end connected to the input side of the driver circuit and the ground via the resistor R2. The connection point between the resistors R1 and R2 is the connection point 1a. The driver circuit 11 is connected between the power supply voltage VDD2 and the ground, and the output side is connected to the output terminal (out).

Since the resistor R2 is connected to the connection point 1a as described above, it is connected in series with the resistor R1 when viewed from the input terminal (in) side. Therefore, the input signal input to the input protection circuit 10 is divided by the resistors R1 and R2 and input to the driver circuit 11. The power supply voltage VDD2 is lower than the power supply voltage VDD1, the power supply voltage VDD1 is connected to the input protection circuit 10, and the power supply voltage VDD2 is connected to the driver circuit 11. Therefore, a signal with a high voltage level can be converted into a signal with a low voltage level.

Next, the operation of the first embodiment will be described. First, the resistance R is 2Ω, the resistance R2 = 3Ω, the power supply voltage V
Assuming that DD1 = 5V is set, from the following formula 1),

VDD2 = VDD1 × (R2 / R1 + R2) (1)

VDD2 = 3V. In this state, the input terminal in of the input protection circuit 10 is supplied with 5V "H" shown in FIG.
When a level input signal is input (in in FIG. 2), the input signal is divided by the resistors R1 and R2 (1 in FIG. 2).
a) is input to the driver circuit 11. Then, the driver circuit 11 outputs a signal having a voltage level of the power supply voltage VDD2 = 3V (out in FIG. 2). When an “L” level (ground level) input signal is input to the input terminal in of the input protection circuit, an “L” level signal is output from the output terminal out of the driver circuit 11 as in the conventional example. ..

FIG. 3 is a circuit diagram of an input circuit device showing an embodiment (embodiment 2) of the second invention. In FIG. 3, reference numeral 12 is a drive circuit as a second driver circuit including a P-channel transistor 12a and an n-channel transistor 12b. The other components are the same as those in the first embodiment and will not be described. However, the internal structure of the driver circuit 11 is also shown, and the driver circuit 11 is composed of a two-stage inverter circuit including a P-channel transistor 11a and an n-channel transistor 11b.
In the second embodiment, the resistor R2 is connected to the driver circuits 12 and 11
It is connected between the connection point of and the ground. The driver circuit 12 is connected between the power supply voltage VDD1 and the ground. An input signal input from the input terminal in of the input protection circuit 10 is divided via the driver circuit 12 by the internal resistance Ron and the resistance R2 when the driver circuit is in the ON state and input to the driver circuit 11. .. The operation after this is the same as that shown in the first embodiment, and will be omitted. In this case, power supply voltage VDD1 = 5V, power supply voltage V
If DD2 = 3V, the following formula 2)

VDD2 = VDD1 × (Ron / R1 + R2) (2)

The resistors may be selected so that R2: Ron = 3: 2. Of course, the larger the resistance is, the more the current value can be reduced, but on the contrary, since the operation speed becomes slower, the resistance value is determined in consideration of both of them. The second embodiment is particularly effective for a signal having a low voltage level.

FIG. 4 is a circuit diagram of an input circuit device showing an embodiment (third embodiment) of the third invention. In FIG. 4, reference numeral 40 denotes an internal circuit as a driven circuit, and the others are the same as those in the first embodiment. Internal circuit 40 has power supply voltage VDD2
Is connected to the ground, and the other circuits are connected to the power supply voltage VDD1. In the third embodiment, the resistor R2
Are provided between the driver circuit 11 and the internal circuit 40. One end of the resistor R2 is the output terminal 1 of the driver circuit 11.
1 is connected between the connection point of the internal circuit 40 and the ground. Since the operation is the same as in the first and second embodiments, the description will be omitted.

[0021]

According to the first aspect of the present invention, by providing the second resistor between the input protection circuit and the driver circuit without providing a special circuit, the voltage between signals having different voltage levels is increased. Since the configuration is such that conversion is possible, there is an effect that the degree of integration in a semiconductor integrated circuit such as an LSI can be increased and the manufacturing cost can be reduced.

According to the second invention, since the second driver circuit is provided between the input protection circuit and the first driver circuit, in addition to the effect of the first invention, a small voltage level is provided. It has the effect that it can also be used for signals. In particular, it is effective when there is a large difference between the voltage levels of the signals to be converted in voltage.

According to the third aspect of the invention, the second resistor is provided between the driver circuit and the internal circuit such as the LSI, and between the ground and the ground. Therefore, in addition to the effect of the first aspect of the invention, There is an effect that it can be applied to a circuit different from the configuration of the first invention.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an input circuit device showing an embodiment of the first invention.

FIG. 2 is a waveform diagram showing the operation of each part of the apparatus shown in FIG.

FIG. 3 is a circuit diagram of an input circuit device showing an embodiment of the second invention.

FIG. 4 is a circuit diagram of an input circuit device showing an embodiment of the third invention.

FIG. 5 is a schematic diagram of a system of a semiconductor integrated circuit device having a voltage conversion circuit according to a conventional technique.

6 is a circuit diagram showing an input circuit in the apparatus of FIG.

[Explanation of symbols]

 10 Input Protection Circuit 11, 12 Driver Circuit 40 Internal Circuit R2 Resistance VDD1, VDD2 Power Supply Voltage

[Procedure amendment]

[Submission date] October 5, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction content]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a MIS semiconductor integrated circuit device ( metal insulator circuit).
relates an input circuit of a semiconductor integrated circuit nductor circuit) or the like, particularly, it relates to an input circuit device for a voltage converting a signal having a certain voltage level to a signal with other voltage levels.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

2. Description of the Related Art In recent semiconductor integrated circuits such as MIS semiconductor integrated circuits, the miniaturization of LSIs has been developed along with the demand for higher integrated circuits, and the development of low voltage LSIs has also been advanced. Under such a current situation, for example, 5V operation system L
Two power supply LSIs, SI and 3V operation chip circuit
But it may as mixed in the system, in order to achieve matching of the voltage level between the signal between the power supply voltage different LSI, a voltage conversion circuit capable converted voltage level, SS
I (small scale integration)
n) or MSI (medium scale inte)
It was necessary to install it in the system .
FIG. 5 specifically shows this state. In FIG. 5, 50 and 54 are 5V operation system circuits, 51 and 53 are voltage conversion circuits, and 52 is a 3V (3.3V) operation circuit (LS).
I). Next, FIG. 6 is a circuit diagram showing an input circuit generally used in a conventional MIS semiconductor integrated circuit device. In FIG. 6, 10 is an input protection circuit composed of diodes D1 and D2 and a resistor R1, 11 is a driver circuit composed of two stages of inverters, and VDD1 is a power supply voltage.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

Next, the operation of this conventional example will be described. When a signal of "H" voltage level is input to the input terminal (in) of the input protection circuit I0, this signal is output to the output terminal (out) via the driver circuit 11. At this time, in the driver circuit 11, the P circuit that constitutes this circuit is
Since the channel transistor is turned on, the power supply voltage VDD1
The signal of the voltage level of is output. In the same way,
When a signal having a voltage level of “L” is input to the input terminal (in) of the input protection circuit 10, a “L” signal that is a ground level is output to the output terminal (out) of the driver circuit 11. .. Therefore, in order to output a signal from this driver circuit to a circuit having a power supply voltage different from the power supply voltage VDD1, the voltage conversion circuits 51 and 53 as shown in FIG. 5 are required.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

[0004]

Since the input circuit of the conventional MIS semiconductor integrated circuit is configured as described above, signals are exchanged between LSIs having different power supply voltages.
In order to match the voltage level of the signal , the LSI
Between the voltage conversion circuit 51 and the circuit of the LSI,
It is necessary to provide 53. Therefore, it is composed of LSI
There is a problem that the integration degree of the system is reduced and the manufacturing cost is increased.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction content]

The present invention has been made to solve the above problems, and an input capable of voltage conversion of signals between LSIs having different power supply voltages without providing a special circuit such as a voltage conversion circuit. An object is to provide a circuit device.

[Procedure Amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction content]

FIG. 3 is a circuit diagram of an input circuit device showing an embodiment (embodiment 2) of the second invention. In FIG. 3, reference numeral 12 is a second driver circuit composed of a P-channel transistor 12a and an n-channel transistor 12b.
It is a road . The other components are the same as those in the first embodiment and will not be described. However, the internal structure of the driver circuit 11 is also shown, and the driver circuit 11 is composed of a two-stage inverter circuit including a P-channel transistor 11a and an n-channel transistor 11b. In the second embodiment, the resistor R2 is connected between the connection point of the driver circuits 12 and 11 and the ground. Further, the driver circuit 12 has the power supply voltage VD.
It is connected between D1 and ground. Input protection circuit 10
The input signal input from an input terminal in of the, P-channel of the driver circuit through a driver circuit 12 transients
The internal resistance Ron and the resistance R2 when the star 12a is in the ON state
The voltage is divided by and is input to the driver circuit 11. The operation after this is the same as that shown in the first embodiment, and will be omitted. In this case, if the power supply voltage VDD1 = 5V and the power supply voltage VDD2 = 3V, according to the following equation (2) ,

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

VDD2 = VDD1 × (R2 / Ron + R2) (2)

[Procedure Amendment 8]

[Document name to be amended] Statement

[Name of item to be corrected] 0019

[Correction method] Change

[Correction content]

The resistors may be selected so that R2: Ron = 3: 2. Of course, the larger the resistance is, the more the current value can be reduced, but on the contrary, since the operation speed becomes slower, the resistance value is determined in consideration of both of them .

[Procedure Amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction content]

FIG. 4 is a circuit diagram of an input circuit device showing an embodiment (third embodiment) of the third invention. In FIG. 4, reference numeral 40 denotes an internal circuit (driven circuit), and other elements are the same as those in the first embodiment. The internal circuit 40 is connected between the power supply voltage VDD2 and the ground, and the other circuits are connected to the power supply voltage V2.
It is connected to DD1. In the third embodiment, the resistor R2 is provided between the driver circuit 11 and the internal circuit 40. One end of the resistor R2 is connected between the connection point of the output terminal 11 of the driver circuit 11 and the internal circuit 40 and the ground. Since the operation is the same as in the first and second embodiments, the description will be omitted.

[Procedure Amendment 10]

[Document name to be amended] Statement

[Name of item to be corrected] 0022

[Correction method] Change

[Correction content]

According to the second invention, since the second driver circuit is provided between the input protection circuit and the first driver circuit, the same effect as the first invention can be obtained.

Claims (3)

[Claims] 1. A diode comprising two diodes connected in series connected between a first power source and ground, and a first resistor having one end connected between both diodes, wherein the two diodes are connected to each other. An input circuit device comprising an input protection circuit in which an input signal is input to and an output signal is sent out from the other end of the first resistor, and a driver circuit which voltage-drives a driven circuit. A second power supply that supplies a voltage lower than the voltage to the driver circuit, and an output signal of the input protection circuit, which is provided between the output side of the input protection circuit and ground, are connected to the first resistor. An input circuit device comprising: a second resistor for converting the output signal into a signal having the same voltage level as the voltage of the second power supply by dividing the voltage and inputting the voltage to the driver circuit. 2. A diode, comprising two diodes connected in series connected between a first power source and ground, and a first resistor having one end connected between the two diodes, the diode being connected between the two diodes. The input circuit device comprises an input protection circuit in which an input signal is input to the input circuit and an output signal is sent from the other end of the first resistor, and a first driver circuit which voltage-drives the driven circuit. A second power supply for supplying a voltage lower than the voltage of the power supply of the first driver circuit to the first driver circuit;
And a second driver circuit that is connected between the power source and the ground and outputs the output signal of the input protection circuit to the first driver circuit, and is provided between the output side of the second driver circuit and the ground. The output signal of the second driver circuit is divided by the internal resistance when the second driver circuit is in the ON state and is input to the first driver circuit, whereby the output signal of the second driver circuit is output. An input circuit device comprising: a second resistor for converting a signal having the same voltage level as the voltage of the power supply of 1. 3. A diode including two diodes connected in series connected between a first power source and ground, and a first resistor having one end connected between the two diodes, the diode being connected between the two diodes. A driver circuit connected between an input protection circuit in which an input signal is input to the input terminal and an output signal is sent from the other end of the first resistor, and the first power source and ground, and which drives the driven circuit by voltage. And a second power supply for supplying a voltage lower than the voltage of the first power supply to the drive circuit and an output side of the driver circuit and the ground. The output signal of is divided by the internal resistance when the driver circuit is in the ON state and input to the driven circuit, so that the output signal becomes a signal having the same voltage level as the voltage of the second power supply. The second resistance for voltage conversion An input circuit device having a resistance.