Interface board, a multichip package (MCP) test system including the interface board, and an MCP test method using the MCP test system

In an interface board for testing a multichip package, the multichip package includes a first type semiconductor chip and a second type semiconductor chip, the interface board includes a first surface facing the multichip package and a second surface facing a test apparatus, the first surface includes upper terminals that are electrically connected to terminals of the multichip package, the second surface includes lower terminals that are electrically connected to the test apparatus, and the upper terminals include a first upper terminal group for testing the first type semiconductor chip and a second upper terminal group for testing whether a crack defect exists in the second type semiconductor chip.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority under 35 U.S.C. § 119 to Korean Patent Application No. 10-2015-0159922, filed on Nov. 13, 2015, in the Korean Intellectual Property Office, the disclosure of which is incorporated by reference herein in its entirety.

TECHNICAL FIELD

The inventive concept relates to an interface board, a multichip package (MCP) test system comprising the interface board, and an MCP test method using the MCP test system.

DISCUSSION OF RELATED ART

A multichip package (MCP) product including two or more types of semiconductor chips that are not connected to each other undergoes various tests. A final test may be performed on a first type semiconductor chip of the two or more types of semiconductor chips. At this time, a second type semiconductor chip of the two or more types of semiconductor chips may have already passed a different test. However, the second type semiconductor chip may have been subsequently cracked in a transfer process or in a process of preparing the first type semiconductor chip for testing.

SUMMARY

According to an exemplary embodiment of the inventive concept, there is provided an interface board for testing a multichip package, wherein the multichip package includes a first type semiconductor chip and a second type semiconductor chip, the interface board includes a first surface facing the multichip package and a second surface facing a test apparatus, the first surface includes upper terminals that are configured to be electrically connected to terminals of the multichip package, the second surface includes lower terminals that are configured to be electrically connected to the test apparatus, and the upper terminals include a first upper terminal group for testing the first type semiconductor chip and a second upper terminal group for testing whether a crack defect exists in the second type semiconductor chip.

According to an exemplary embodiment of the inventive concept, there is provided a method of testing a multichip package including a first type semiconductor chip and a second type semiconductor chip, the method includes disposing an interface board between the multichip package and a test apparatus, applying a first signal to the multichip package to test the first type semiconductor chip, applying a second signal to the multichip package to test whether a crack defect exists in the second type semiconductor chip, and determining the multichip package to be non-defective when a current flowing in the second type semiconductor chip in response to the second signal is less than about 10 mA.

According to an exemplary embodiment of the inventive concept, there is provided a multichip package test system including a plurality of test apparatuses sequentially arranged in a test order, a plurality of chamber units for connecting semiconductor devices contained in a test tray to the plurality of test apparatuses, a transfer portion for carrying the test tray between the plurality of chamber units, and a controller for controlling the plurality of chamber units, wherein a multichip package includes a first type semiconductor chip and a second type semiconductor chip, a final test apparatus of the plurality of test apparatuses further includes an interface board for testing the multichip package, the interface board includes a first surface facing the multichip package and a second surface facing test terminals, the first surface includes upper terminals that are configured to be electrically connected to terminals of the multichip package, the second surface includes lower terminals that are configured to be electrically connected to the test terminals, and the upper terminals include a first upper terminal group for testing the first type semiconductor chip and a second upper terminal group for testing whether a crack defect exists in the second type semiconductor chip.

According to an exemplary embodiment of the inventive concept, there is provided an interface board having a first surface facing a multichip package to be tested and a second surface facing a test apparatus, wherein the first surface includes a first upper terminal group for testing a first type semiconductor chip of the multichip package and a second upper terminal group for testing whether a crack defect exists in a second type semiconductor chip of the multichip package, the second surface includes a first lower terminal group for connecting the first upper terminal group to the test apparatus and a second lower terminal for connecting the second upper terminal group to the test apparatus, and terminals of the second upper terminal group are electrically connected to one another in the interface board.

According to an exemplary embodiment of the inventive concept, there is provided an interface board comprising: a first terminal group and a second terminal group disposed on a first side of the interface board, wherein the first terminal group is configured to receive signals from a first type semiconductor device and the second terminal group is configured to receive signals from a second type semiconductor device; and a third terminal group and a fourth terminal disposed on a second side of the interface board, wherein the third terminal group corresponds to the first terminal group and the fourth terminal corresponds to the second terminal group, and wherein the fourth terminal is electrically connectable to a channel terminal of a test apparatus.

DETAILED DESCRIPTION OF THE EMBODIMENTS

FIG. 1is a schematic plan view of a test handler unit1.

Referring toFIG. 1, the test handler unit1may include a loading unit H1100for loading semiconductor devices contained in a customer tray, into a test tray H200, a test unit H1200for connecting the semiconductor devices loaded in the test tray H200to test equipment H400, and an unloading unit H1300for classifying the tested semiconductor devices by grades according to a test result and loading the classified semiconductor devices into the customer tray.

The loading unit H1100performs a process of loading semiconductor devices to be tested into the test tray H200. The loading unit H1100may include a loading stacker H1110for storing a customer tray containing the semiconductor devices to be tested and a loading picker H1120for transferring the semiconductor devices to be tested from the customer tray to the test tray H200. After the semiconductor devices to be tested are loaded in the test tray H200, the test tray H200is transferred to the test unit H1200.

The test unit H1200performs a process of electrically connecting the semiconductor devices loaded in the test tray H200to the test equipment H400. Accordingly, as the semiconductor devices loaded in the test tray H200are electrically connected to the test equipment H400, the test equipment H400tests the semiconductor devices loaded in the test tray H200. When the testing of the semiconductor devices is completed, the test tray H200is transferred to the unloading unit H1300.

The unloading unit H1300performs an unloading process in which the tested semiconductor devices are removed from the test tray H200. The unloading unit H1300may include an unloading stacker H1310for storing the customer trays containing the tested semiconductor devices and an unloading picker H1320for transferring the tested semiconductor devices from the test tray H200to the customer tray. As the tested semiconductor devices are transferred to the customer tray, the test tray H200is empted, and then, the empty test tray H200is transferred back to the loading unit H1100.

As described above, the test handler unit1sequentially performs the loading process, the test process, and the unloading process while circularly transferring the test tray H200in one apparatus.

FIG. 2is a view of a test handler system2according to an exemplary embodiment of the inventive concept.

Referring toFIG. 2, the test system2according to the present embodiment may include a conveyer unit S2for carrying a test tray S100, a plurality of chamber units S3for performing a test process of electrically connecting semiconductor devices contained in the test tray S100to test equipment S300, a controller S4for controlling each of the chamber units S3, and a sorting unit S5separate from the chamber units S3.

The sorting unit S5performs a process of loading semiconductor devices to be tested into the test tray S100and a process of unloading tested semiconductor devices from the test tray S100.

The conveyer unit S2carries the test tray S100between the chamber units S3and the sorting unit S5, which are separated from each other, such that the test process may be independently performed with respect to the performance of the loading process and the unloading process.

FIG. 3is a side view illustrating a method of testing semiconductor devices using an interface board in the test equipment according to an exemplary embodiment of the inventive concept.

Referring toFIG. 3, a tray110where a plurality of semiconductor devices D to be tested are disposed may be arranged above an interface board120on a test apparatus T. In this state, to enhance a close contact between the tray110, the interface board120, and the test apparatus T, a match plate50for applying a certain pressure from the above may be further provided.

The test apparatus T is configured to test particular properties of the semiconductor devices D. For example, only one or two or more of the properties may be tested.

As illustrated inFIG. 3, a pressurization apparatus60applies pressure to the match plate50, and the pressure is transferred to the tray110so that the tray110may be made to closely contact the interface board120. Furthermore, the interface board120may be made to closely contact the test apparatus T due to the pressure.

When the pressure is released after the test ends, the interface board120and the test apparatus T may be detached from each other by an elastic force applied by the interface board120or the test apparatus T. Furthermore, the tray110may be configured to be detached from the interface board120.

FIG. 4is a side view illustrating the interface board120according to an exemplary embodiment of the inventive concept, which is interposed between the test apparatus T and a multichip package (MCP)130.

Referring toFIG. 4, the MCP130may include a first type semiconductor chip130D1and a second type semiconductor chip130D2. In an exemplary embodiment of the inventive concept, the first type semiconductor chip130D1may include a plurality of semiconductor chips. In an exemplary embodiment of the inventive concept, the second type semiconductor chip130D2may include a plurality of semiconductor chips.

Furthermore, the first type semiconductor chip130D1and the second type semiconductor chip130D2may not be electrically connected to each other in an MCP state. In other words, the first type semiconductor chip130D1may be connected to a first terminal group130_1through its own unique connection, and the first terminal group130_1may not be electrically connected to the second type semiconductor chip130D2. Likewise, the second type semiconductor chip130D2may be connected to a second terminal group130_2through its own unique connection, and the second terminal group130_2may not be electrically connected to the first type semiconductor chip130D1.

Accordingly, when any one of the first and second terminal groups130_1and130_2of the MCP130is designated, a semiconductor chip connected to the designated terminal group may be either the first type semiconductor chip130D1or the second type semiconductor chip130D2. Furthermore, the designated terminal group may be connected to only one of the first type semiconductor chip130D1and the second type semiconductor chip130D2.

AlthoughFIG. 4exemplarily illustrates a package in which the MCP130has a shape of a ball grid array (BGA), the present inventive concept is not limited thereto.

The first type semiconductor chip130D1and the second type semiconductor chip130D2may each be a volatile memory device or a non-volatile memory device. In an exemplary embodiment of the inventive concept, the first type semiconductor chip130D1and the second type semiconductor chip130D2may each be a dynamic random access memory (DRAM) device, a flash memory device, or a memory controller.

Furthermore, the first type semiconductor chip130D1and the second type semiconductor chip130D2may be different types of semiconductor devices.

For example, the first type semiconductor chip130D1may be a DRAM device and the second type semiconductor chip130D2may be a flash memory device. In an exemplary embodiment of the inventive concept, the first type semiconductor chip130D1may be a DRAM device and the second type semiconductor chip130D2may be a stack structure of a flash memory device and a controller chip. In an exemplary embodiment of the inventive concept, the first type semiconductor chip130D1may be a flash memory device and the second type semiconductor chip130D2may be a DRAM device. In an exemplary embodiment of the inventive concept, the first type semiconductor chip130D1may be a stack structure of a flash memory device and a controller chip and the second type semiconductor chip130D2may be a DRAM device.

In an exemplary embodiment of the inventive concept, the first terminal group130_1may include a plurality of terminals. For example, the first terminal group130_1may include power terminals130_1_VCC and130_1_VCCQ. Power may be applied to the power terminals130_1_VCC and130_1_VCCQ. Furthermore, the first terminal group130_1may include channel terminals130_1_CMD,130_1_DAT,130_1_CLK, and130_1_ETC. Channel signals may be applied to the channel terminals130_1_CMD,130_1_DAT,130_1_CLK, and130_1_ETC. The channel signals may be applied at a voltage lower than the power voltage.

In an exemplary embodiment of the inventive concept, the second terminal group130_2may include a plurality of terminals. For example, the second terminal group130_2may include power terminals130_2_VDD1,130_2_VDD2,130_2_VDDCA, and130_2_VDDQ. In a general operation, power is applied to the power terminals130_2_VDD1,130_2_VDD2,130_2_VDDCA, and130_2_VDDQ, however, in a test, channel signals may be applied to the power terminals130_2_VDD1,130_2_VDD2,130_2_VDDCA, and130_2_VDDQ. Furthermore, the second terminal group130_2may include channel terminals130_2_CLK and130_2_ETC. In the general operation, channel signals may be applied to the channel terminals130_2_CLK and130_2_ETC, however, the channel terminals130_2_CLK and130_2_ETC may be grounded during the test.

AlthoughFIG. 4illustrates an example in which the first terminal group130_1and the second terminal group130_2are solder balls, connectors having different shapes such as a land or a pin may be used in accordance with an exemplary embodiment of the inventive concept.

The first terminal group130_1may correspond to a first upper terminal group120_U1provided on an upper surface of the interface board120. The first upper terminal group120_U1may include terminals120_U11,120_U12,120_U13,120_U14,120_U15, and120_U16corresponding to the terminals of the first terminal group130_1.

The second terminal group130_2may correspond to a second upper terminal group120_U2provided on the upper surface of the interface board120. The second upper terminal group120_U2may include terminals120_U21,120_U22,120_U23,120_U24,120_U25, and120_U26corresponding to the terminals of the second terminal group130_2. The second upper terminal group120_U2may be provided to test only whether a crack defect exists in the second type semiconductor chip130D2.

Terminals of the first upper terminal group120_U1may correspond to terminals of a first lower terminal group120_L1provided on a lower surface of the interface board120. In other words, the terminals120_U11,120_U12,120_U13,120_U14,120_U15, and120_U16may correspond to terminals120_L11,120_L12,120_L13,120_L14,120_L15, and120_L16. The terminals120_U11,120_U12,120_U13,120_U14,120_U15, and120_U16of the first upper terminal group120_U1may be electrically connected to the terminals120_L11,120_L12,120_L13,120_L14,120_L15, and120_L16of the first lower terminal group120_L1, respectively, via a first internal line120_IC1.

Terminals of the second upper terminal group120_U2may correspond to terminals of a second lower terminal group120_L2provided on the lower surface of the interface board120.

Among the terminals of the second upper terminal group120_U2, the terminals120_U21,120_U22,120_U23, and120_U24corresponding to the power terminals130_2_VDD1,130_2_VDD2,130_2_VDDCA, and130_2_VDDQ of the second terminal group130_2may be electrically connected to an identical single terminal120_L22. The terminals120_U21,120_U22,120_U23, and120_U24may be electrically connected to one another through a wiring inside the interface board120. Furthermore, the terminals120_U21,120_U22,120_U23, and120_U24may be electrically connected to the terminal120_L22via the wiring inside the interface board120, in other words, a second internal line120_IC2.

Among the terminals of the second upper terminal group120_U2, the terminals120_U25and120_U26corresponding to the channel terminals130_2_CLK and130_2_ETC of the second terminal group130_2may be electrically connected to an identical single terminal120_L21. The terminals120_U25and120_U26may be electrically connected to each other via a wiring inside the interface board120. Furthermore, the terminals120_U25and120_U26may be electrically connected to the terminal120_L21via the wiring inside the interface board120.

The first lower terminal group120_L1of the interface board120may correspond to a first test terminal group TP_1for testing the first type semiconductor chip130D1, among the terminals TP_1and TP_2of the test apparatus T. In other words, the terminals120_L11,120_L12,120_L13,120_L14,120_L15, and120_L16may correspond to the terminals TP_11, TP_12, TP_13, TP_14, TP_15, and TP_16. The terminals TP_11, TP_12, TP_13, TP_14, TP_15, and TP_16may apply various signals to test the first type semiconductor chip130D1.

The second lower terminal group120_L2of the interface board120may correspond to the second test terminal group TP_2for testing whether a crack defect exists in the second type semiconductor chip130D2, among the terminals TP_1and TP_2of the test apparatus T. In other words, the terminals120_L21and120_L22may correspond to terminals TP_21and TP_22.

A channel signal to test whether a crack defect exists in the second type semiconductor chip130D2may be input to the channel terminal TP_22. In an exemplary embodiment of the inventive concept, the terminal TP_21may be grounded while the channel signal to test whether a crack defect exists in the second type semiconductor chip130D2is input to the channel terminal TP_22.

Furthermore, while the channel signal to test whether a crack defect exists in the second type semiconductor chip130D2is input to the terminal TP_22, the terminals TP_11, TP_12, TP_13, TP_14, TP_15, and TP_16of the first test terminal group TP_1may be grounded.

The channel signal input to the terminal TP_22to test whether a crack defect exists in the second type semiconductor chip130D2may have a voltage of about 0.3 V or more. If the second type semiconductor chip130D2does not have a crack defect, when a channel signal of about 0.3 V or more is applied to the terminal TP_22and the terminals TP_11, TP_12, TP_13, TP_14, TP_15, and TP_16are grounded, substantially no current flows between any one of the terminals TP_11, TP_12, TP_13, TP_14, TP_15, and TP_16and the terminal TP_22. However, if the second type semiconductor chip130D2has a crack defect, when a channel signal of about 0.3 V or more is applied to the terminal TP_22and the terminals TP_11, TP_12, TP_13, TP_14, TP_15, and TP_16are grounded, a current of about 10 mA or more may flow therebetween. This is due to a short circuit that is generated between the terminal of the second type semiconductor chip130D2and the grounded terminals due to the crack.

Although the current flowing when a short circuit is generated may vary depending on the amount of applied power, the current may still be about 10 mA or more.

FIG. 5is a flowchart for describing an MCP test method according to an exemplary embodiment of the inventive concept.

Referring toFIG. 5, a plurality of tests, in other words, a test A1to a test AN, may be performed on the MCP130. The test A1to the test ANmay include a test on the first type semiconductor chip130D1and a test on the second type semiconductor chip130D2in the MCP130.

Previously, when the first type semiconductor chip130D1undergoes a test AN+1, which is the last test of all of the tests, and the first type semiconductor chip130D1has passed all of the tests, the first type semiconductor chip130D1is released as a passed product. However, even though the second type semiconductor chip130D2has passed all of the tests from the test A1to the test AN, the second type semiconductor chip may acquire a defect, such as a chip crack, when the test AN+1is performed on the first type semiconductor chip130D1. Even when a process of testing the second type semiconductor chip130D2is inserted just before the test AN+1of the first type semiconductor chip130D1, a crack defect may still be generated in the second type semiconductor chip130D2when performing the test AN+1on the first type semiconductor chip130D1. Furthermore, even when the process of testing the second type semiconductor chip130D2is inserted just after the test AN+1of the first type semiconductor chip130D1, the first type semiconductor chip130D1itself may acquire a crack defect while testing the second type semiconductor chip130D2.

In an exemplary embodiment of the inventive concept, after the test AN+1is performed on the first type semiconductor chip (P110), in the same test apparatus, without moving a tray, a channel signal of a relatively low voltage is applied to determine only the existence of a leakage current (P120). If there is a leakage current, it may be determined that a crack defect exists in the second type semiconductor chip130D2. The MCP130may be directly released without a further test just after passing the above test method (P100).

Furthermore, since in the operation P100only the existence of a crack defect is tested with respect to the second type semiconductor chip130D2, all other tests for the second type semiconductor chip130D2may have already been performed by other test apparatuses prior to the operation P100. In other words, the test A1to the test ANmay have already been performed on the second type semiconductor chip130D2upstream before the test AN+1.

The interface board120described above with reference toFIG. 4may be used in the operation P100ofFIG. 5.

FIG. 6is a side view illustrating a use state of an interface board120A according to an exemplary embodiment of the inventive concept.

Referring toFIG. 6, an MCP130is arranged above the test apparatus T with an interface board120A interposed therebetween. The MCP130may include the first type semiconductor chip130D1and the second type semiconductor chip130D2. In addition, the MCP130may include the first terminal group130_1and the second terminal group130_2on a lower surface thereof. Since a connection relationship therebetween is described above with reference toFIG. 4, redundant descriptions thereof are omitted herein.

The first upper terminal group120_U1corresponding to the first terminal group130_1is provided on an upper surface of the interface board120A. In addition, the second upper terminal group120_U2corresponding to the second terminal group130_2is provided on the upper surface of the interface board120A.

The first lower terminal group120_L1corresponding to the first upper terminal group120_U1is provided on the lower surface of the interface board120A. In addition, the second lower terminal120_L21corresponding to the second upper terminal group120_U2is provided on the lower surface of the interface board120A.

Unlike the embodiment ofFIG. 4, in the embodiment ofFIG. 6, the terminals of the second upper terminal group120_U2are all connected to the second lower terminal120_L21, in other words an identical single terminal, regardless of whether the second lower terminal120_L21is a power terminal or not. The terminals of the second upper terminal group120_U2may be electrically connected to one another inside the interface board120A.

The first lower terminal group120_L1may correspond to the terminals TP_1of the test apparatus T. The second lower terminal120_L21may correspond to the terminal TP_21of the test apparatus T. The second upper terminal group120_U2may be electrically connected to an identical single terminal via the second lower terminal120_L21.

The terminal TP_21of the test apparatus T may be a channel terminal. Accordingly, a channel signal may be input to the second type semiconductor chip130D2via the terminal TP_21and the second lower terminal120_L21. As described above, the channel signal may have a voltage of about 0.3 V or more.

After the test for the first type semiconductor chip130D1is completed, the terminal TP_1is grounded so that the first lower terminal group120_L1and the first upper terminal group120_U1may be grounded and consequently the first terminal group130_1may be grounded. In this state, a channel signal may be applied to the terminal TP_21.

When the second type semiconductor chip130D2does not have a crack, a current of the second type semiconductor chip130D2detected by an ammeter Amp connected to the terminal TP_21is within several milliamperes (mA). When the current detected by the ammeter Amp is substantially within about 10 mA, the second type semiconductor chip130D2may be determined to be a non-defective product.

When the second type semiconductor chip130D2has a crack, a leakage current is generated at a grounded point from the terminal TP_21of the second type semiconductor chip130D2, and thus, a slight current flow may be detected by the ammeter Amp. In other words, the ammeter Amp may detect a current of about 10 mA or more. In this case, the second type semiconductor chip130D2is determined to have a crack.

FIG. 7is a flowchart for describing a method of determining a crack defect of the second type semiconductor chip130D2, according to an exemplary embodiment of the inventive concept. The operations ofFIG. 7may correspond to the operation P100ofFIG. 5.

Referring toFIGS. 4, 5, and 7, the MCP130may be arranged above the test apparatus T by interposing the interface board120for an MCP test therebetween (P210).

The test apparatus T is a final test apparatus of a plurality of test apparatuses that the MCP130undergoes. The interface board120is an interface board customized for the test apparatus T.

The test apparatus T is configured to test a particular one of the properties of the first type semiconductor chip130D1with respect to the MCP130. Furthermore, the test apparatus T may be an apparatus previously used to test the particular properties of the first type semiconductor chip130D1.

FIGS. 8A and 8Bare side views illustrating a test method using the same test apparatus T and only replacing interface boards120convand120exaccording to an exemplary embodiment of the inventive concept.

Referring toFIG. 8A, the MCP130may include a first terminal group130_1A corresponding to the first type semiconductor chip130D1and a second terminal group130_2A corresponding to the second type semiconductor chip130D2.

The interface board120convmay include a first upper terminal group120_U1A, and a second upper terminal group120_U2A, on an upper surface thereof, respectively corresponding to the first terminal group130_1A and the second terminal group130_2A.

The interface board120convhas a first lower terminal group120_L1A corresponding to the first upper terminal group120_U1A, and the first lower terminal group120_L1A corresponds to terminals TP of the test apparatus T.

The second upper terminal group120_U2A on the upper surface of the interface board120convmay be grounded.

Of the terminals TP that are electrically connected to the first type semiconductor chip130D1via the interface board120conv, there is a channel terminal TP_minor that is not important or is unnecessary for the test performed by a final test apparatus. When the channel terminal TP_minor is used for the test performed by the final test apparatus, as illustrated inFIG. 8A, the channel terminal TP_minor is connected to terminals of the interface board120conv. However, this may not be the case if a test using the channel terminal TP_minor was performed in a test apparatus preceding the final test by the final test apparatus.

It is assumed inFIG. 8Bthat a test using the channel terminal TP_minor is performed by a preceding test apparatus, and thus, the channel terminal TP_minor is not needed for the test performed by the final test apparatus. In this case, in a modified interface board120ex, the second upper terminal group120_U2A may be connected to the second lower terminal120_L21. The second lower terminal120_L21may be a terminal corresponding to the channel terminal TP_minor among the terminals belonging to the first lower terminal group120_L1A according to the embodiment described above with reference toFIG. 8A.

As illustrated inFIG. 8B, the second upper terminal group120_U2A is electrically connected to the second lower terminal120_L21that is a common single terminal in the interface board120ex. Furthermore, the second lower terminal120_L21may be electrically connected to the terminal TP_21that is the channel terminal TP_minor of the test apparatus T. The channel terminal TP_21is a terminal for inputting a signal having a voltage lower than power.

As illustrated inFIG. 8B, the channel terminal TP_21(TP_minor) is used for testing the second type semiconductor chip130D2after the change of the interface board. In other words, the channel terminal TP_21may be electrically connected to the second type semiconductor chip130D2via the second lower terminal120_L21and the second upper terminal group120_U2A.

Referring back toFIGS. 4, 5, and.7, a first signal to test the first type semiconductor chip130D1may be applied to the MCP130(P220). The test of the first type semiconductor chip130D1may be, for example, a functional test, a direct current (DC) test, or an alternating current (AC) test, but the present inventive concept is not limited thereto.

The functional test may be a test to verify whether a semiconductor device operates corresponding to an intended logic function. The DC test may be a current (IDD) test, an electrostatic discharge (ESD) test, or an electrical overstress (EOS) test, but the present inventive concept is not limited thereto. The AC test may be a test related to a timing item, but the present inventive concept is not limited thereto.

When the first type semiconductor chip130D1passes the present test after applying the first signal to the first type semiconductor chip130D1, a second signal is applied to the MCP130to test whether a crack defect exists in the second type semiconductor chip130D2(P230).

To accomplish this, the second signal may be applied to the channel terminal TP_21(seeFIG. 8B). The second signal may have a voltage lower than a generally supplied power, for example, a voltage of about 0.3 V or more. The second signal is sequentially transmitted to the second lower terminal120_L21and the second upper terminal group120_U2A via the channel terminal TP_21, and then, to the second type semiconductor chip130D2via a power terminal of the second terminal group130_2A. The second signal may be input to the second type semiconductor chip130D2via the power terminal of the second type semiconductor chip130D2.

In this state, the first terminal group130_1A and/or the first lower terminal group120_L1A related to the first type semiconductor chip130D1may be all grounded.

As described above, when the second type semiconductor chip130D2has no crack defect, a current flows as low as within several milliamperes in response to the second signal. In other words, when the current of the second terminal group130_2A, which is the power terminal of the second type semiconductor chip130D2, is as low as within several milliamperes (P240), the MCP130may be determined to be a non-defective product (P250). In this state, the current flowing as low as within several milliamperes means a current less than about 10 mA, where a difference of about 0.5 mA to 8 mA exists according to the type of device.

When a current of about 10 mA or more flows in the second type semiconductor chip130D2in response to the second signal (P240), the MCP130may be determined to be defective (P260).

FIG. 9is a side view illustrating a use state of an interface board120B according to an exemplary embodiment of the inventive concept.

Referring toFIG. 9, an MCP130A may include the first type semiconductor chip130D1, the second type semiconductor chip130D2, and a third type semiconductor chip130D3. In an exemplary embodiment of the inventive concept, the first type semiconductor chip130D1may include a plurality of semiconductor chips. In an exemplary embodiment of the inventive concept, the second type semiconductor chip130D2may include a plurality of semiconductor chips. In an exemplary embodiment of the inventive concept, the third type semiconductor chip130D3may include a plurality of semiconductor chips.

Furthermore, the first type semiconductor chip130D1, the second type semiconductor chip130D2, and the third type semiconductor chip130D3in the MCP130A may not be electrically connected to one another. In other words, the first type semiconductor chip130D1may be connected to a first terminal group130_1B through its own unique connection, and the first terminal group130_1B may not be electrically connected to the second type semiconductor chip130D2and the third type semiconductor chip130D3. Likewise, the second type semiconductor chip130D2is connected to a second terminal group130_2B through its own unique connection. The second terminal group130_2B may not be electrically connected to the first type semiconductor chip130D1and the third type semiconductor chip130D3. Furthermore, the third type semiconductor chip130D3is connected to a third terminal group130_3B through its own unique connection, and the third terminal group130_3B may not be electrically connected to the first type semiconductor chip130D1and the second type semiconductor chip130D2.

Accordingly, when any one of the terminals of the first to third terminal groups130_1B,130_2B, and130_3B provided under the MCP130A is designated, the semiconductor chip connected to the designated terminal may be any one of the first type semiconductor chip130D1, the second type semiconductor chip130D2, and the third type semiconductor chip130D3. Furthermore, the designated terminal may be connected to only one of the first type semiconductor chip130D1, the second type semiconductor chip130D2, and the third type semiconductor chip130D3.

The first type semiconductor chip130D1, the second type semiconductor chip130D2, and the third type semiconductor chip130D3may each be volatile memory devices or non-volatile memory devices. In an exemplary embodiment of the inventive concept, the first type semiconductor chip130D1, the second type semiconductor chip130D2, and the third type semiconductor chip130D3may each be DRAM devices, flash memory devices, or memory controllers. Furthermore, the first type semiconductor chip130D1, the second type semiconductor chip130D2, and the third type semiconductor chip130D3may be different types of semiconductor devices.

For example, the first type semiconductor chip130D1may be a DRAM device, the second type semiconductor chip130D2may be a flash memory device, and the third type semiconductor chip130D3may be a controller chip. In an exemplary embodiment of the inventive concept, the first type semiconductor chip130D1may be a DRAM device, the second type semiconductor chip130D2may be a controller chip, and the third type semiconductor chip130D3may be a flash memory device.

The first terminal group130_1B may correspond to a first upper terminal group120_U1B provided on an upper surface of the interface board120B. The second terminal group130_2B may correspond to a second upper terminal group120_U2B provided on the upper surface of the interface board120B. The third terminal group130_3B may correspond to a third upper terminal group120_U3B provided on the upper surface of the interface board120B.

The second upper terminal group120_U2B may be used to test only whether the second type semiconductor chip130D2has a crack defect. The third upper terminal group120_U3B may be used to test only whether a crack defect exists in the third type semiconductor chip130D3.

Terminals of the first upper terminal group120_U1B may respectively correspond to terminals of a first lower terminal group120_L1B provided on a lower surface of the interface board120B. Terminals of the second upper terminal group120_U2B may respectively correspond to the second lower terminal120_L21provided on the lower surface of the interface board120B. Terminals of the third upper terminal group120_U3B may respectively correspond to a third lower terminal120_L31provided on the lower surface of the interface board120B.

The first lower terminal group120_L1B of the interface board120B may correspond to the first test terminal group TP_1for testing the first type semiconductor chip130D1, among the terminals TP of the test apparatus T.

The second lower terminal120_L21and the third lower terminal120_L31of the interface board120B may respectively correspond to the channel terminal TP_21and a channel terminal TP_31among the terminals TP of the test apparatus T.

A second signal that is a channel signal to test whether a crack defect exists in the second type semiconductor chip130D2may be input to the channel terminal TP_21. A third signal that is a channel signal to test whether a crack defect exists in the third type semiconductor chip130D3may be input to the channel terminal TP_31. The first lower terminal group120_L1B may be entirely grounded.

FIG. 10is a side view illustrating a use state of an interface board120C according to an exemplary embodiment of the inventive concept.

Referring toFIG. 10, both of a second upper terminal group120_U2C and a third upper terminal group120_U3C are connected to the second lower terminal120_L21. Unlike the embodiment ofFIG. 9, the third lower terminal120_L31is not provided.

The first terminal group130_1B may correspond to a first upper terminal group120_U1C provided on an upper surface of an interface board120C. The second terminal group130_2B may correspond to the second upper terminal group120_U2C provided on the upper surface of the interface board120C. The third terminal group130_3B may correspond to the third upper terminal group120_U3C provided on the upper surface of the interface board120C.

The second upper terminal group120_U2C may be used to test only whether a crack defect exists in the second type semiconductor chip130D2. The third upper terminal group120_U3C may be used to test only whether a crack defect exists in the third type semiconductor chip130D3.

Terminals of the first upper terminal group120_L1C may respectively correspond to terminals of a first lower terminal group120_L1C provided on a lower surface of the interface board120C. Both of the second upper terminal group120_U2C and the third upper terminal group120_U3C may be connected to the second lower terminal120_L21. The second upper terminal group120_U2C and the third upper terminal group120_U3C may be electrically connected to each other inside the interface board120C.

The first lower terminal group120_L1C of the interface board120C may correspond to the first test terminal group TP_1for testing the first type semiconductor chip130D1, among the terminals TP of the test apparatus T. The second lower terminal120_L21of the interface board120C may correspond to the channel terminal TP_21among the terminals TP of the test apparatus T.

A second signal that is a channel signal to test whether a crack defect exists in the second type semiconductor chip130D2and the third type semiconductor chip130D3may be input to the channel terminal TP_21.

Since both of the second upper terminal group120_U2C and the third upper terminal group120_U3C are connected to the second lower terminal120_L21in the interface board120C, the interface board120C may be manufactured in a simpler structure and at a lower cost, compared to the interface board120B ofFIG. 9.

FIG. 11is a side view illustrating a user state of an interface board120D according to an exemplary embodiment of the inventive concept.

Referring toFIG. 11, a second upper terminal group120_U2D and a power terminal120_U1D of a first upper terminal group120_U1D are connected to the second lower terminal120_L21using a switch device120D_SW, which is different from the embodiment ofFIG. 9.

The first terminal group130_1D may correspond to the first upper terminal group120_U1D provided on an upper surface of the interface board120D. The second terminal group130_2D may correspond to the second upper terminal group120_U2D provided on the upper surface of the interface board120D. Among the first terminal group130_1D, a power terminal130_1'D may correspond to the power terminal120_U1'D of the first upper terminal group120_U1D provided on the interface board120D. The second upper terminal group120_U2D and the power terminal120_U1'D of the first upper terminal group120_U1D correspond to the second lower terminal120_L21via the switch device120D_SW.

The second upper terminal group120_U2D may be provided to test only whether a crack defect exists in the second type semiconductor chip130D2.

Terminals of the first upper terminal group120_U1D may respectively correspond to terminals of a first lower terminal group120_L1D provided on a lower surface of the interface board120D. The second upper terminal group120_U2D and the power terminal120_U1'D of the first upper terminal group120_U1D may be connected to the second lower terminal120_L21by the switch device120D_SW.

The first lower terminal group120_L1D of the interface board120D may correspond to the first test terminal group TP_1to test the first type semiconductor chip130D1among the terminals TP of the test apparatus T. The power terminal120_U1'D of the first upper terminal group120_U1D may connect to the second lower terminal120_L21by the switch device120D_SW. The second lower terminal120_L21of the interface board120D may correspond to a power terminal TP_21of the terminals TP of the test apparatus T.

The second upper terminal group120_U2D to test whether a crack defect exists in the second type semiconductor chip130D2may correspond to the power terminal TP_21among the terminals TP of the test apparatus T as the switch device120D_SW is connected thereto.

In the interface board120D, the second upper terminal group120_U2D and the power terminal120_U1'D of the first upper terminal group120_U1D are selectively connected to the second lower terminal120_L21by the switch device120D_SW.

According to the above-described embodiments, whether a crack defect exists in a semiconductor chip may be easily determined by just a simple leak current test without having to transfer the semiconductor chip. Accordingly, an efficiency of an individual test is maintained in the final operation of an existing test method.

Furthermore, according to the above-described embodiments, the test cost may be reduced because the existing test equipment may be used as is by replacing just the interface board.

While the inventive concept has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood that various changes in form and details may be made therein without departing from the spirit and scope of the inventive concept as defined by the following claims.