JPH02295162A - Integrated circuit device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Technical field The present invention relates to integrated circuit devices.

BACKGROUND ART When integrating a circuit for signal processing of a video signal having multiple signal formats such as NTSCSPALSSECAM, a single type of integrated circuit device that can process signals of any format is designed and manufactured. It is common practice to reduce costs by increasing production efficiency in this way.

In such a conventional integrated circuit device, in addition to sharing circuits, a plurality of dedicated circuits necessary for processing each signal of each signal format and a switching control signal for controlling operation mode switching are inputted. The input signal to be processed is selectively supplied to one of the plurality of dedicated circuits according to the switching control signal. When this conventional integrated circuit device is incorporated into a device, a switching control signal corresponding to the signal format of the signal handled by the device is supplied to the switching control input terminal.

Such conventional integrated circuit devices have problems in that the number of input/output terminals increases, the size of the device increases, and the manufacturing cost increases.

Summary of the Invention The present invention has been made in view of the above points, and includes:
It is an object of the present invention to provide an integrated circuit device that can reduce the number of input/output terminals, thereby reducing the size and cost.

In the integrated circuit device according to the present invention, a switching control signal input pad connected to a switching control signal input terminal of an electronic circuit whose operation mode changes depending on the level of the switching control signal and a predetermined reference potential point is provided. A resistive element is formed on the chip, and one conductor is to be maintained at a potential different from the potential of a switching control signal input pad and a predetermined reference potential point among the plurality of conductor terminals according to an operation mode to be set in advance. A connection is made between the terminal and the terminal.

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, 1 is a semiconductor chip.

A plurality of circuits are formed on the semiconductor chip 1, including a signal processing circuit 2 that processes, for example, a video signal. The signal processing circuit 2 is supplied with video signals output from other circuits on the semiconductor chip 1 or input from the outside.

As shown in FIG.
format signal processing mode. That is, the signal processing circuit 2 includes, for example, four dedicated circuits that process each of the first, second, third, and fourth format signals, and a decoder that decodes a 2-bit binary code. The mode switching control signals A and B are input to the decoder as signals corresponding to each bit of the 2-bit binary code, and each of the four decoded outputs is used to convert the first, second, third and fourth format signals. The input signal is configured to be selectively provided to one of four dedicated circuits for processing. In FIG. 2, "L0" represents a low level, and "H" represents a high level.

The input terminal of the mode switching control signal A in the signal processing circuit 2 is connected to the pad pA.

A pull-up resistor R1 is connected between pad PA and power supply pad PC.
is connected. The power supply pad Po is connected to the semiconductor chip 1
It is connected to the power supply line of the signal processing circuit 2 and other circuits formed above.

Further, the input terminal of the mode switching control signal B in the signal processing circuit 2 is connected to the bad ps.

A pull-down resistor R2 is connected between the pad Pa and the ground pad P. The ground pad PG is connected to the ground line of the signal processing circuit 2 and other circuits formed on the semiconductor chip 1. Note that the resistors Rl and R2 can be configured by diffused resistors, but may also be configured by MOS transistors formed to act as resistive loads.

The semiconductor chip 1 is fixed to a frame 4 fixed to a substrate part 3 of the package as an outer covering member. A power supply pad Po on the semiconductor chip 1 is connected to a conductor terminal TD for power supply fixedly provided on the substrate portion 3 of the package by a bonding wire Wo. Further, the ground pad P. is connected by a bonding wire W (,) to a grounding conductor terminal TG fixed to the substrate portion 3 of the package.

In the above configuration, the mode switching control signal A is applied to the pull-up resistor R. The mode switching control signal B is at a high level due to the pull-down resistor R2.

Here, when the pad P^ is connected to the conductor terminal TG by a bonding wire as shown by a single point 11 line a, the mode switching control signal A becomes low level.

Furthermore, when the pad P8 is connected to the conductor terminal TD by a bonding wire as shown by the dashed line b, the mode switching control signal B becomes high level. Therefore, the mode of the signal processing circuit 2 can be controlled as shown in FIG. 3 depending on the presence or absence of the connection.

Therefore, in the process of mounting the semiconductor chip 1 on the substrate part 3 of the package and connecting each pad and conductor terminal with bonding wires, the desired connection can be achieved by making the connections according to the mode to be set for the signal processing circuit 2. An integrated circuit device will be obtained. For this reason, bad pA,
There is no need to provide a dedicated conductor terminal for connecting Ps, the number of input/output terminals does not increase, and it is possible to achieve miniaturization and reduce manufacturing costs.

Effects of the Invention As detailed above, in the integrated circuit device according to the present invention, a switching control signal input pad connected to a switching control signal input terminal of an electronic circuit whose operation mode changes depending on the level of the switching control signal and a predetermined A resistive element connected between reference potential points is formed on the chip, and a switching control signal is generated at a potential different from the potential at a predetermined reference potential point among the human power pad and a plurality of conductor terminals, depending on the operation mode to be set in advance. A connection is made between the conductor terminal and the conductor terminal, which should be maintained at

Therefore, in the integrated circuit device according to the present invention, there is a problem in the electronic circuit during the assembly process of the integrated circuit device. It is possible to set the mode in advance, there is no need to separately provide a dedicated conductor terminal for inputting control signals for mode setting, the number of input/output terminals can be reduced, and the size is smaller. In addition, it is possible to reduce manufacturing costs.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing one embodiment of the present invention, and FIGS. 2 and 3 are diagrams showing the operation of each part of the apparatus shown in FIG. 1. Explanation of symbols of main parts 1...Semiconductor chip 2...Signal processing circuit R,, R2...Resistors PA, Pa, PC, Pa---Pad T ■,T(,
...Conductor terminal applicant Pioneer Corporation Pioneer Video Corporation

Claims (1)

[Claims] A plurality of conductor terminals that connect to an external circuit, an electronic circuit whose operating mode changes depending on the level of a switching control signal,
An integrated circuit device comprising a switching control signal input pad connected to a switching control signal input terminal of the electronic circuit, the integrated circuit device comprising a resistance element connected between the switching control signal input pad and a predetermined reference potential point. one conductor that is to be maintained at a potential different from the potential of the switching control signal input pad and the predetermined reference potential point of the plurality of conductor terminals according to the operation mode of the electronic circuit that should be prepared and set in advance; An integrated circuit device characterized in that a connection is made between terminals.