JPH0738018A - Ic package - Google Patents

Abstract

PURPOSE:To provide an IC package capable of freely altering the position of a terminal when, in the case where IC design and printed board design are simultaneously achieved upon development of a device, there is produced the need of alteration of the terminal position principally after the completion of the designs. CONSTITUTION:There is provided a terminal correspondence alteration chip 1 between an IC chip 2 and a substrate 5, the terminal correspondence alteration chip 1 including means for freely altering a connection relation between an input/output pin 4 for external lead of an IC package 10 and a plurality of input/output terminals of the IC chip 2 in response to an external instruction 8. Hereby, terminal alteration of the IC package 10 is ensured, and there is eliminated the need of a redesign concerning the terminal position upon circuit alteration of a printed board 5 on the IC chip 2 and of waiting time of terminal position determination of the IC chip 2. Thus, the prime cost of an article is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an IC package,
In particular, the present invention relates to an IC package containing an IC chip.

[0002]

2. Description of the Related Art In a conventional IC package, a plurality of input / output pins led out of the package and input / output terminals of an IC chip are directly connected in a one-to-one correspondence, and the connection relationship is fixed. Met.

[0003]

When developing a device,
There are cases where full-custom IC design and printed circuit board design are performed in parallel to reduce costs, but at the start of design, the order and position of the IC package terminals (input / output pins derived from the IC package to the outside) have not been determined. In some cases, the circuit may be changed after completion, and it may be necessary to change the order or position of the terminals. When changing, it is necessary to match one of the IC package side and the printed circuit board side with the other, but in many cases the circuit wiring on the printed circuit board was redesigned from the development cost and development period.

That is, since the input / output pins of the conventional IC package are fixedly connected to the input / output terminals of the IC chip housed in the package in a one-to-one correspondence, the IC
The I / O pins of the package cannot be changed, so the wiring on the printed circuit board side must be changed. Also,
Since the IC chip is a single component sealed in the package, there is a drawback that the order and position of the input / output pins of the package cannot be changed.

It is an object of the present invention to provide an IC package in which the correspondence between the terminals of the input / output pins led out of the package, the terminals of the IC chip and the terminals of the IC chip can be freely changed.

[0006]

The IC package of the present invention is an IC package having a plurality of input / output pins and a plurality of input / output terminals.
It is characterized by including a C chip and a means for changing the connection relation between the input / output pin and the terminal of the IC chip in accordance with an external command.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an external side view of an embodiment of the present invention. An IC package 10 comprises an IC chip 2 and a terminal correspondence changing chip 1. The terminal 3 of the IC chip 2 and the external lead-out input / output pin 4 of the IC package 10 are electrically connected to each other by the terminal correspondence changing chip 1, and the changing chip 1 mutually connects them. The electrical connection can be changed freely.

Reference numeral 5 shown in FIG. 1 denotes a printed circuit board,
The input / output pins 4 of the IC package 10 are inserted into the pin insertion holes of the printed circuit board 5 for soldering.

FIG. 2 is a diagram showing an internal circuit example of the terminal correspondence changing chip 1 shown in FIG. In this example, for simplification, the number of terminals 3 of the IC chip 1 is three (3a to 3).
(indicated by c), and the number of input / output pins 4 of the IC package 10 is also three (indicated by 4a to 4c).

For each of the terminals 3a to 3c, for example, 3
A total of 9 switching MOS transistors (6
(Indicated by). The drains of the three MOS transistors 61 to 63 are commonly connected to the terminal 3a.
The sources of the individual MOS transistors 61 to 63 are connected to the input / output pins 4a to 4c of the package 10, respectively.

Similarly, three MOSs are provided for the terminal 3b.
The drains of the transistors are commonly connected, and these three M
The sources of the OS transistors are connected to the input / output pins 4a-4c of the package 10, respectively. The same applies to the other terminals 3c.

The output of the terminal correspondence changing program circuit 7 is supplied to each gate in order to turn on / off the MOS transistor group 6. The gate of each MOS transistor is controlled by a control signal supplied from an external program setting terminal 8 to control each transistor on / off.

In such a configuration, when connecting the terminal 3a and the input / output pin 4a, the transistor 61 is turned on and the transistors 62 and 63 are turned off. When connecting the terminals 3a and 4b, the transistor 62 is turned on and the transistors 61 and 63 are turned off.

Other terminals 3b and 3c and input / output pins 4a ...
Similarly, the connection relationship with 4c can be easily changed by similarly controlling ON / OFF of each transistor.

It should be noted that the circuit example of FIG. 2 is merely an example, and it is obvious that various modifications can be made. For example, instead of the MOS transistor 6, another switching element such as a bipolar transistor can be used.

[0017]

According to the present invention, when a circuit change occurs on a printed circuit board or when it is necessary to change the terminal position by determining the terminal position of an IC chip for circuit function which was undecided at the beginning of development, it is possible to cope with the terminal. Since the relationship change function makes it easy to change the terminal position, the conventional printed circuit board or IC
The waiting time for redesigning the terminal position and determining the terminal position of the circuit function IC chip due to the change of the circuit of the chip becomes unnecessary. In particular, regarding the change of the terminal position in the conventional IC chip for circuit function, the target range often extends to the characteristics of the circuit, and the cost required for this is enormous, but this can be avoided.

An IC for circuit function that has already been designed and developed
If the chip is also housed in one package together with the IC chip for changing the terminal correspondence relationship of the present invention, it is possible to cope with the adjustment of the terminal position even for a device under design. As described above, the present invention can reduce the redesign cost for changing the terminal position due to the circuit change, and thus has an economic effect of contributing to the cost reduction of the product.

[Brief description of drawings]

FIG. 1 is a side view of an appearance showing an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a circuit configuration example of a terminal correspondence changing chip 1 of FIG.

[Explanation of symbols]

 1 terminal correspondence changing chip 2 IC chip 3 IC chip terminal 4 IC package input / output pin 5 printed circuit board 6 transistor switch group 7 terminal position programming circuit 8 program setting terminal 10 IC package

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] January 10, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

Claims (1)

[Claims] 1. An IC chip having a plurality of input / output pins, a plurality of input / output terminals, and means for changing a connection relationship between the input / output pins and terminals of the IC chip according to an external command. Characteristic IC package.