JPH0437059A - Semiconductor device - Google Patents

Abstract

PURPOSE:To reduce influence upon each power supply by independently supply ing power supply signals to an internal circuit, a buffer of input signals or output signals, a buffers of sinals which are outputted or inputted with the same timing, and a buffer of I/O signals. CONSTITUTION:Output signals and I/O signals are classified into the signals outputted with the same timing. In this case, the division into two groups, i.e., a buffer 91 of a first group and a buffer 92 of a second group can be assumed. Hence a first power supply 3, a second power supply 4, a third power supply 5, and a fourth power supply 6 are independently supplied to an internal circuit 7, a buffer group 8 of input signals, the buffer 91 of the first group of output signals, and the buffer 92 of the second group of output signals, respectively, thereby reducing influence upon each power supply.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a semiconductor device, and particularly to a semiconductor device such as a microprocessor that inputs and outputs signals at high speed.

[Conventional technology]

An example of a conventional semiconductor device will be explained using FIG. 2. In the figure, 1 is a semiconductor device, 2 is a buffer group, 3 is a first power supply, 4 is a second power supply, 5 is a third power supply, 6 is a fourth power supply,
7 is an internal circuit, 8 is a buffer group for input signals, and 9 is a buffer group for output signals and input/output signals.

In the semiconductor device 1 shown in FIG. 2, a plurality of power supplies (VKID and vss) 3 to 6 are input in order to further stabilize the potential. Inside this semiconductor device 1, the plurality of input power supplies 3 to 6 are combined into one power source and supplied to the entire semiconductor device.

In this case, since the power supplies are connected internally, the potential does not vary depending on the location of the semiconductor device, but when the value of at least one output signal changes, the amount of current is large, so If the value of the power supply (■. and ■8.) changes, it will affect other signals and internal circuits.

[Problem to be solved by the invention]

As mentioned above, the power supply value changes greatly when the output signal changes, so if the same power supply is used for the entire semiconductor device, the power supply value of other signals and internal circuits will change, resulting in However, there was a problem that it would malfunction.

The present invention has been made in view of the above points, and an object of the present invention is to reduce the influence on other signals and internal circuits due to a large change in the power supply value when the output signal changes.

[Means to solve the problem]

The semiconductor device according to the present invention is configured to independently supply power (Vl and V8.) to an internal circuit, an input signal buffer, an output signal outputted at the same timing, and an input/output signal buffer.

In addition, in the semiconductor device according to another aspect of the present invention, the internal circuit, the output signal buffer 1, and the input signal and input/output signal buffers input at the same timing are provided with an independent power supply (VDII).
I and V8. ).

[For production]

In the present invention, by independently supplying power signals to internal circuits, input signal or output signal buffers, signals that are output or input at the same timing, and input/output signal buffers, the influence on each other's power supplies is reduced. .

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the drawings.

FIG. 1 is a schematic diagram of a semiconductor device according to an embodiment of the present invention. In the figure, 1 is a semiconductor device, 2 is a buffer group, 3 is a first power supply, 4 is a second power supply, 5 is a third power supply, 6 is a fourth power supply, 7 is an internal circuit, and 8 is a buffer group for input signals. ,9. are buffers forming the first group of output signals,
9t is a buffer forming the second group of output signals.

That is, in this embodiment, the first power supply 3 is connected to the internal circuit 7, and the second power supply 4 is connected to the input signal buffer group 2.
and further connect to the third power supply 5. By connecting the fourth power supply 6 to the buffers 91, 9□ of the first and second groups of output signals, respectively, the power signals of these power supplies 3 to 6 are independently supplied to each section. Note that the same reference numerals in the figures indicate the same or corresponding parts.

In the semiconductor device 1 shown in FIG. 1, output signals and input/output signals are classified into signals that are output at the same timing. In this case, two groups, namely the first group of buffers 9
．． Assume that it can be divided into a second group of buffers 9t.

As a result, internal circuit 7. Bumper group of input signals8. Buffer 95 for the first group of output signals. The second output signal
Group buffer9. A first power source 3. 2nd power supply 4. Third power supply 5. By supplying the fourth power source 6 independently, the influence on each power source can be reduced.

Note that the present invention is not limited to the embodiment shown in FIG. 1, but includes an internal circuit and an output buffer for output signals.

Power may be supplied independently to the buffers for input signals and input/output signals that are input at the same timing, and the same effect as in the above embodiment can be obtained.

〔Effect of the invention〕

As explained above, according to the present invention, by supplying independent power to each of the internal circuit input signal or output signal buffer, the signal output or input at the same timing, and the input/output signal group, they can influence each other. Since the semiconductor device has a power source that is never affected by noise, it is possible to suppress fluctuations in the power source caused by signals from other power source groups, thereby providing a semiconductor device that is less susceptible to noise.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing a semiconductor device according to an embodiment of the present invention, and FIG. 2 is a schematic configuration diagram showing a conventional semiconductor device. DESCRIPTION OF SYMBOLS 1... Semiconductor device, 2... Buffer group, 3... First power supply, 4... 21st source, 5... Third power supply, 6...
... Fourth power supply, 7. Internal circuit, 8. Buffer group for input signals, 9I.. Buffer for first group of output signals, 9. ...buffer for the second group of output signals. Figure 1

Claims (2)

[Claims] (1) In a semiconductor device having a plurality of power supply signals, at least one input signal, at least one output signal, and at least one input/output signal, a part of the plurality of power supply signals is connected to an internal circuit, and , connect a part of the plurality of power supply signals to the input buffer of at least one input signal, group at least one output signal and input/output signal into signals that are output at the same timing, and create a buffer for each group. A semiconductor device characterized in that a part of the power supply signal is connected to the power supply signals, and the power supply signals connected to each of the power supply signals are independent. (2) In a semiconductor device having a plurality of power supply signals, at least one input signal, at least one output signal, and at least one input/output signal, a part of the plurality of power supply signals is connected to an internal circuit, and , connect a part of the plurality of power supply signals to the output buffer of at least one output signal, group at least one input signal and input/output signal into signals that are input at the same timing, and create a buffer for each group. A part of the plurality of power supply signals is connected to the semiconductor device, and the power supply signals connected to each of the power supply signals are independent.