JP3346707B2 - Inspection method for semiconductor integrated circuit device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for inspecting a semiconductor integrated circuit device, and more particularly to a method for testing each electrode of a semiconductor integrated circuit device mounted on a long tape or a tape connected to the electrode. The present invention relates to a method for testing a semiconductor integrated circuit device by bringing a test probe connected to a test device into contact with a test electrode.

[0002]

2. Description of the Related Art In a tape carrier package (TCP), only LSI chips judged to be non-defective in a wafer test are mounted on a long tape, and thereafter, the reel is transferred to a handler in units of one reel. A final test is carried out for each chip mounted and mounted on the long tape, one chip at a time, and only those judged as non-defective in this final test are sealed with resin. The final test is performed by supplying a power supply voltage, an input signal, and the like generated by the tester to each electrode of each chip via each test probe of the probe card mounted on the handler. Each LSI chip operates in response to the supplied power supply voltage, input signal, and the like, supplies an output signal to a tester via a probe card, and performs a pass / fail determination by determining the signal with the tester. In the above final test, it is assumed that each test probe and the test pad on the tape connected to each electrode of the LSI chip are in correct contact. In most cases, manual inspection is performed while looking at the microscope and images. As the number of pins increases, the size of test pads decreases, and test pads are reduced, positioning using such methods is limited. It is the current situation that is occurring.

[0003]

As described above, the conventional method has its limitations.

[0004] In addition, when a test is performed by alignment using a conventional method, there is a trade-off with the accuracy of the handler, but a position shift occurs during the test, and a failure determination due to a contact failure may occur. At this time, if failures occur consecutively, the handler stops and the displacement can be detected. If such a device exists, a device that has been determined to be defective due to a contact failure may be directly processed as a defective product in addition to detecting a position shift.

The present invention has been made to solve the above problems.

[0006]

A method of inspecting a semiconductor integrated circuit device of the present invention According to an aspect of the or each electrode of the semiconductor integrated circuit device mounted on the tape long is on the tape that is connected to the respective electrodes to the test electrode, thus it does not contact the connected test probes to the test apparatus, the in method of inspecting a semiconductor integrated circuit device, providing a test probe displacement detection conductor pattern at a predetermined position on said tape, Conductor pattern for detecting the displacement of the test probe
At least <br/> arranged such that each contact with the emissions before the three test probe displacement detection probe
Contact the conductor pattern for detecting the displacement of the test probe.
And adjust the position of the test probe.
The position of each of the test probes via the output conductor pattern
The presence or absence of a displacement of the test probe and the test probe are determined according to the electrical conduction between the detection probes.
It is characterized in that the direction of the position deviation of the step is detected.

[0007] Further, the present invention is characterized in that, when the displacement of the test probe is detected, the fact that the position of the test probe is displaced is notified .

According to the present invention, the presence or absence and the direction of the displacement between the test probe and the test electrode or LSI electrode are automatically detected. Therefore, the operation of correcting the alignment between the two can be easily performed according to the result. As a result, the position of the test probe and the test electrode (LSI electrode) can be easily adjusted while increasing the number of pins / reducing the size of the test pad and reducing the number of test pads.

If a contact failure occurs due to a displacement during the test, the fact is reported. As a result, in the related art, a defect caused by a contact failure due to a position shift may be treated as a defective product as it is, but this can be eliminated.

Japanese Patent Application Laid-Open No. 2-215146 discloses a technical idea similar to the present invention.
In the technique disclosed in the publication, since the direction of the position shift cannot be detected, it is necessary to visually confirm and perform a correction operation when the position shift occurs.

[0011]

An embodiment of the present invention will be described below in detail with reference to the drawings.

In this embodiment, a pattern for detecting a positional shift is provided at a corner portion of an area allocated to one LSI chip on a long tape, and three patterns for detecting a positional shift are provided in correspondence with the pattern. In this configuration, a probe is provided. That is, the probe card is provided with a predetermined number of test probes and three displacement detection probes.

FIG. 2 is a diagram showing a general TCP.
This shows a continuous state before the LSI is separated into a package form to be finally used. In the figure, 1 is a tape, 2
Is an area required for each LSI, and 4 is a sprocket hole.

FIG. 1 is a partially enlarged view of FIG. 2, and
It is a lineblock diagram of this embodiment. In the figure, 3 is each LS
In the area required for the electrical test of I, the LSI chip 6
There are test pads 7 and connection wiring between them. Reference numeral 5 denotes a test probe, and each probe 5 comes into contact with each test pad 7 on the tape. Each test pad 7
Are connected to the respective electrodes of the LSI by wiring on the tape. A1 is an inverted L-shaped test probe position shift detecting conductor pattern formed at the lower right corner of the area 2 required for each LSI, and includes B1, C1 and D1.
Is provided so as to contact the conductor pattern A1,
These are three displacement detection probes. Also, BB1,
CC1 and DD1 indicate the normal positions where the probes B1, C1 and D1 are in contact, respectively. That is,
If each test probe 5 is correctly contacting each test pad 7, each probe B1, C1 and D1 will have a conductor pattern A at BB1, CC1 and DD1, respectively.
Touch 1. On the other hand, if the displacement of each test probe 5 occurs, the contact positions of the probes B1, C1, and D1 also shift. In addition, the said conductor pattern A1 is, for example,
It is made of Al or the like and is formed at the same time as the test pad or the wiring on the tape.

The detection of the displacement between the test probe and the test pad is performed as follows.

After setup, first, a predetermined voltage or current is applied from the tester to the displacement detecting probe C1.
The tester determines whether the voltage level or the current value is output to the probes B1 and D1. At this time, if there is no displacement of the test probe, the probes B1, C1 and D1 also come into contact with the conductor pattern A1 at regular positions, and a predetermined voltage level or current value is obtained for the probes B1 and D1. Thus, it is possible to detect that the position displacement between the test probe and the test pad has not occurred. On the other hand, when the test probe and the test pad are misaligned, the contact position of the misregistration detection probe also deviates from the normal position, and the contact position of any of the probes is outside the conductor pattern A1. Therefore, a predetermined output cannot be obtained for the probe B1 or D1, or for both probes B1 and D1. Thus, it is possible to detect that the test probe is displaced.

As described above, first, the presence or absence of a position shift is detected.

Next, the detection of the direction of the positional deviation will be described.

If the displacement is detected, then a predetermined voltage or current is applied to the probe B1 from the tester,
The tester determines whether the voltage level or the current value is output to the probes C1 and D1. Further, a predetermined voltage or current is applied to the probe D1 from the tester,
The tester determines whether the voltage level or the current value is output to the probes B1 and C1.

FIG. 3 shows four modes of the displacement.
(A) is shifted to the left, (b) is shifted to the right, (c) is shifted to the upper, (d) is shifted
This is the case where the position is shifted downward. In each figure, BB
1 ′, CC1 ′ and DD1 ′ are contact positions of the respective displacement detection probes when a displacement occurs, and B
B1, CC1, and DD1 are regular contact positions.

In the case of (a), a predetermined output is not obtained from the probe D1 in the former determination, and in the latter determination,
A predetermined output is not obtained in any of the probes B1 and C1. In the case of (b), a predetermined output is not obtained from the probe C1 in the former determination, and a predetermined output is not obtained from the probe C1 in the latter determination.

In the case of (c), in the former determination, a predetermined output is not obtained from any of the probes C1 and D1, and
In the latter determination, a predetermined output cannot be obtained from the probe B1. In the case of (d), in the former determination, a predetermined output is not obtained from any of the probes C1 and D1, and in the latter determination, a predetermined output is not obtained from any of the probes B1 and C1. .

Therefore, the direction of the displacement is also detected by the above two determinations. In addition, readjustment of the alignment can be easily performed based on the information on the direction of the positional shift.

Further, even during the test, the position shift is detected, and when the position shift is detected, the information is transmitted from the tester to the handler, the handler is stopped, and an alarm is generated. By doing
The re-adjustment of the alignment becomes possible, and the defect determination (erroneous determination) of the non-defective product due to the displacement of the test probe can be eliminated.

The displacement detecting probes B1-C1
Spacing between C1-D1, the shape of the conductor pattern A1,
In addition, the regular contact position on the conductor pattern is set to an optimum position that can detect the displacement with the required accuracy according to the test pad size and the pitch thereof. Also, the number of displacement detection probes is not limited to three, and it is needless to say that a configuration may be adopted in which a greater number of probes are provided to enable more accurate detection of the displacement direction. No.

[0026]

As described above in detail, according to the present invention, it is possible to easily perform the alignment of the test probe during the setup. In addition, it is possible to make no defective product determination due to the displacement of the test probe during the test.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a configuration diagram of a general tape carrier package.

FIG. 3 is a diagram illustrating four modes of positional displacement.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Tape 5 Test probe 6 LSI chip 7 Test pad A1 Conductor pattern for detecting displacement of test probe B1, C1, D1 Probe for detecting displacement of test probe

Claims (2)

(57) [Claims] Is 1. A also each electrode of the semiconductor integrated circuit device mounted on a long tape which is connected to the respective electrodes
The test electrode on the tape, by contacting the connected test probes to the test apparatus, the In method of inspecting a semiconductor integrated circuit device, the conductive pattern test probe displacement detection at a predetermined position on the tape And the position of the test probe
Each contacts the misalignment detection conductor pattern
At least three test probe displacement detecting probes arranged as described above are used to detect the test probe displacement.
Position aligned to contact the use conductive pattern, the Te
Through the conductor pattern for detecting the displacement of the strike probe
Electrical connection between each test probe position detection probe
The presence or absence of the displacement of the test probe according to the passing condition
And detecting the direction of the displacement of the test probe . To 2. A time displacement detection of the test probe, characterized by being configured to notify that the shift position of the test probe, a method of inspecting a semiconductor integrated circuit device according to claim 1.