Abstract:
A semiconductor device includes a main region suitable for performing a first test operation and a second test operation respectively based on a first test signal and a second test signal in a test mode, a first test region electrically connected to the main region and suitable for generating and transferring the first test signal to the main region in the test mode, and a second test region electrically connected to the main region or the first test region with a scribe lane disposed therebetween and suitable for generating and transferring the second test signal to the main region in the test mode.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    The present application claims priority of Korean Patent. Application No. 10-2013-0104126, filed on Aug. 30, 2013, which is incorporated herein by reference in its entirety. 
       BACKGROUND 
       [0002]    1. Field 
         [0003]    Exemplary embodiments of the present invention relate to a semiconductor design technology, and more particularly, to a semiconductor device with an effective structure for a test and method of manufacturing the same, 
         [0004]    2. Description of the Related Art 
         [0005]    Manufacturing a semiconductor device includes a fabrication process in a wafer level, an electrical test in the wafer level, a packaging process and an electrical test in a packaged level. 
         [0006]    As such, many test operations are inevitably performed in the course of manufacture of the semiconductor device. A defective device screened through the test operations is discarded. 
         [0007]      FIG. 1  is a block diagram illustrating a conventional semiconductor device. 
         [0008]    Referring to  FIG. 1 , the semiconductor device includes a main region  10  and a test region  20 . 
         [0009]    The main region  10  includes circuits for performing normal operation to meet the purpose of the semiconductor device. For example, the main region  10  of the semiconductor device used as a storage device includes circuits for storing data and the main region  10  of the semiconductor device used as a high-speed operating device such as a central processing unit (CPU) includes circuits for performing a high-speed operation. 
         [0010]    The test region  20  includes test circuits for verifying the normal operation of circuits included in the main region  10 . The test circuits verify the normal operation of circuits included in the main region  10  through the exchange of a test signal with the circuits of the main region  10 . 
         [0011]    A plurality of tests are performed in the course of manufacturing a semiconductor device depending on types of the semiconductor device. The test region  20  may be divided into a main test region TEST 1  and an auxiliary test region TEST 2 . The main test region TEST 1  includes test circuits for performing essential test operations and the auxiliary test region TEST 2  includes test circuits for performing auxiliary test operations. 
         [0012]    For example, the main test region TEST 1  includes test circuits for performing test operations that are required commonly in a wafer level and a package level, whereas the auxiliary test region TEST 2  includes test circuits for performing test operations that are required only in a wafer level and not required henceforward. 
         [0013]    For another example, the main test region TEST 1  includes test circuits for performing test operations that are essential in a stage of a semiconductor device R&amp;D and required selectively in a wafer level or a package level whereas the auxiliary test region TEST 2  includes test circuits for performing test operations that are essential in a stage of a semiconductor device R&amp;D and not required henceforward. 
         [0014]    The test region  20  of conventional semiconductor device includes all of the test circuits without distinction of essentiality or continuous requirement although the test circuits for performing the tests are separated into two test regions TEST 1  and TEST 2 . 
         [0015]    Therefore, the conventional semiconductor device manufactured to include a region that is not required after fabrication, which causes waste of chip size and standby current. 
       SUMMARY 
       [0016]    Various embodiments are directed to a semiconductor device with effective test structure that may prevent unnecessary regions from being included therein, and a method of manufacturing the same. 
         [0017]    In an embodiment, a semiconductor device may include a main region suitable for performing a first test operation and a second test operation respectively based on a first test signal and a second test signal in a test mode, a first test region electrically connected to the main region and suitable for generating and transferring the first test signal to the main region in the test mode, and a second test region electrically connected to the main region or the first test region with a scribe lane disposed therebetween and suitable for generating and transferring the second test signal to the main region in the test mode. 
         [0018]    In an embodiment, a method of manufacturing a semiconductor device may include preparing a substrate in which a normal region and a test region are electrically connected to each other with a scribe lane disposed therebetween, performing a predetermined test operation on the normal region based on a plurality of test signals that are generated in the test region and transferred to the normal region during a wafer test, and removing the test region along the scribe lane after the wafer level test operation. 
         [0019]    In an embodiment, a method of manufacturing a semiconductor device may include preparing a substrate having a main region, a first test region and a second region, wherein a second region is separated from the main region or the first test region by a scribe lane, performing a wafer level test operation on main region by using the first test region, and cutting off the first test region from the substrate before packaged, along the scribe lane. 
         [0020]    In accordance with the above embodiments, it may be possible to prevent a semiconductor device of which test regions dedicated to pre-packaged test may be removed in the course of manufacture of the device from including unnecessary regions after manufacturing. Further, standby current of the semiconductor device after manufacturing may be minimized. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0021]      FIG. 1  is a block diagram illustrating a conventional semiconductor device. 
           [0022]      FIG. 2  is a block diagram illustrating a semiconductor device in accordance with an embodiment of the present invention. 
           [0023]      FIG. 3  is a diagram illustrating electrical connection of a second region to a main region or a first region in the semiconductor device shown in  FIG. 2 . 
       
    
    
     DETAILED DESCRIPTION 
       [0024]    Various embodiments will be described below in more detail with reference to the accompanying drawings. The present invention may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the scope of the present invention to those skilled in the art. Throughout the disclosure, reference numerals correspond directly to the like numbered parts in the various figures and embodiments of the present invention. It is also noted that in this specification “connected/coupled” refers to one component not only directly coupling another component but also indirectly coupling another component through an intermediate component. In addition, a singular form may include a plural form as long as it is not specifically mentioned in a sentence. 
         [0025]      FIG. 2  is a block diagram illustrating a semiconductor device in accordance with an embodiment of the present invention. 
         [0026]    Referring to  FIG. 1 , the semiconductor device (i.e., a substrate on which predetermined semiconductor fabricating processes have been performed) may include a main region  200 , a first test region  220 , and a second test region  240 . 
         [0027]    The main region  200  may include circuits for performing normal operation to meet the purpose of the semiconductor device. For example, the main region  200  of the semiconductor device used as a storage device may include circuits for storing data and the main region  200  of the semiconductor device used as a high-speed processing device such as a central processing unit CPU) may include circuits for performing high-speed operation. 
         [0028]    The first test region  220  and the second test region  240  may include test circuits for verifying the normal operation of circuits included in the main region  200 . The test circuits may verify the normal operation of circuits included in the main region  200  through communication of test signal with the circuits of the main region  200 . 
         [0029]    In detail, the first test region  220  may be connected to the main region  200 , and may generate and transmit a first test signal SIGNAL_A to the main region  200  during a test mode. The main region  200  in the test mode may receive the first test signal SIGNAL_A and perform a first test operation corresponding to the first test signal SIGNAL_A. 
         [0030]    The second test region  240  may be separated from the main region  200  and the first test region  220  by a scribe lane (SL)  250 . In case of (B), the second test region  240  is disposed adjacent to the main region  200  while being intermediated by the scribe lane  250 . Meanwhile, in case of (A), the second test region  240  is disposed adjacent to the first test region  220  while being intermediated by the scribe lane  250 . The second test region  240  may generate and transmit a second test signal SIGNAL_B to the main region  200  during the test mode. The main region  200  in the test mode may receive the second test signal SIGNAL_B and perform a second test operation corresponding to the second test signal SIGNAL_B. 
         [0031]    The scribe lane  250 , generally, may divide a plurality of semiconductor devices (i.e., substrates or dies) formed on a wafer. The scribe lane  250  may be formed between the semiconductor devices in the wafer level. In the package level, each of the semiconductor devices may be separated from the wafer through cutting off (or sawing) the wafer along the scribe lane  250 . 
         [0032]    The second test operation for the main region  200  in the wafer level may be performed through the second test region  240 . The second test region  240  may be removed (or cut off) after the wafer level test due to the structure of the semiconductor device in which the second test region  240  is separated from the main region  200  and the first test region  220  by the scribe lane  250 , while being electrically connected to the main region  200  or the first test region  220 . Such structure of the semiconductor device may prevent the semiconductor device from including unnecessary regions after manufacturing. 
         [0033]    The second test region  240  divided from the main region  200  and the first test region  220  by the scribe lane  250 , may be electrically connected to the main region  200  or the first test region  220 . Further, the second test signal SIGNAL_B may be transmitted from the second test region  240  to the main region  200  when the second test region  240  is electrically connected to the first test region  220 . 
         [0034]    In other words, the second test region  240  may be disposed adjacent to the main region  200  with division by the scribe lane  250 . Alternatively, the second test region  240  may be disposed adjacent to the first test region  220  with division by the scribe lane  250 . It is meant that the embodiment of the present invention may cover any structure with the scribe lane  250  to be cut off after the wafer level test the second test region  240  from the main region  200  and the first test region  220 . 
         [0035]      FIG. 3  is a diagram illustrating electrical connection of the second region  240  to the main region  200  or the first region  220  in the semiconductor device shown in  FIG. 2 . 
         [0036]    Referring to  FIG. 3 , a poly-gate line  260  instead of a metal line  230  may be used as an interconnection for electrical connection of the second test region  240  to the main region  200  or the first test region  220 . 
         [0037]    In detail, the main region  200 , the first test region  220  and the second test region  240  may communicate internal signals N_SIGNAL, A_SIGNAL and B_SIGNAL with one another through the metal line  230  formed therein. 
         [0038]    Also, the main region  200  and the first test region  220  may communicate the internal signals N_SIGNAL and A_SIGNAL with each other through the metal line  230  successively formed between the main region  200  and the first test region  220 . 
         [0039]    However the main region  200  or the first test region  220  and the second test region  240  may communicate the internal signals N_SIGNAL, A_SIGNAL and B_SIGNAL with each other through the poly-gate line  260  independently formed between the main region  200  or the first test region  220  and the second test region  240 . 
         [0040]    The second test signal SIGNAL_B may be transferred from the second test region  240  to the main region  200  through the poly-gate line  260  and the metal line  230  of the main region  200  when the main region  200  and the second test region  240  are electrically connected by the poly-gate line  260 . 
         [0041]    The normal signal N_SIGNAL may be transferred from the main region  200  to the second test region  240  through the poly-gate line  260  and the metal line  230  of the second test region  240  when the main region  200  and the second test region  240  are electrically connected by the poly-gate line  260 . 
         [0042]    The second test signal SIGNAL_B may be transferred from the second test region  240  to the first test region  220  through the poly-gate line  260  and the metal line  230  of the first test region  220  and then transferred together with the first test signal SIGNAL_A from the first test region  220  to the main region  200  through the metal line  230  formed between the main region  200  and the first test region  220  when the first test region  220  and the second test region  240  are electrically connected by the poly-gate line  260 . 
         [0043]    The normal signal N_SIGNAL may be transferred from the main region  200  to the first test region  220  through the metal line  230  of the first test region  220  and then transferred from the first test region  220  to the second test region  240  through the poly-gate line  260  and the metal line  230  of the second test region  240  when the first test region  220  and the second test region  240  are electrically connected by the poly-gate line  260 . 
         [0044]    The poly-gate line  260  is formed with such way as a gate electrode of an active device such as a metal oxide semiconductor (MOS) transistor is formed with a conductive material like polysilicon when the active device is formed on a substrate and is used as an interconnection to transfer a signal. The poly-gate line  260  may be formed with ease and without any further process during a fabrication process where the MOS transistor is fabricated on the substrate. 
         [0045]    The poly-gate line  260  may be in contact with the metal line  230  of the second test region  240  through a first contact CON 1  and with the metal line  230  of the main region  200  or the first test region  220  through a second contact CON 2 . 
         [0046]    The poly-gate line  260  may be formed in a direction substantially perpendicular to the scribe lane  250 . The scribe lane  250  may be formed between the second test region  240  and the main region  200  or the first test region  220 , and thus the poly-gate line  260  may be formed in a direction substantially perpendicular to the scribe lane  250  for transfer of the signals N_SIGNAL, A_SIGNAL and B_SIGNAL between the second test region  240  and the main region  200  or the first test region  220 . 
         [0047]    Benefit of the poly-gate line  260  for transfer of the signals N_SIGNAL, A_SIGNAL and B_SIGNAL between the second test region  240  and the main region  200  or the first test region  220  is that the metal line  230  may still hide in the semiconductor device even after the second test region  240  is removed through cut-off of the wafer along the scribe lane  250 . 
         [0048]    Exposure of the metal line  230  to external may cause corrosion of the device or flowing foreign substance into the device, and thus the benefit of the poly-gate line  260  to allow the metal line  230  to hide in the device advantages the subsequent package level of the semiconductor device. 
         [0049]    The main region  200  or the first test region  220 , to which the second test region  240  may be connected with the scribe lane  250  disposed therebetween, may include a transmission blocking unit  280  for forcibly disabling transmission of signal on the poly-gate line  260  to the metal line  230  in the main region  200  or the first test region  220  in a mode other than the test mode. 
         [0050]    During the test mode where the signals N_SIGNAL, A_SIGNAL and B_SIGNAL are transferred to and from the second test region  240 , the signals N_SIGNAL, A_SIGNAL and B_SIGNAL on the poly-gate line  260  may be transferred to the metal line  230  of the main region  200  or the first test region  220 . However during the mode other than the test mode after removal of the second test region  240 , the signals, which may include unknown signal arbitrarily generated such as a noise, on the poly-gate line  260  should not be transferred to the metal line  230  in the main region  200  or the first test region  220  through forcible disablement of the signals. 
         [0051]    The transmission blocking unit  280  may keep a predetermined voltage level, which may be a ground level VSS, of the metal line  230  in the main region  200  or the first test region  220  that may be connected to the poly-gate line  260  during the mode other than the test mode after removal of the second test region  240 . The transmission blocking unit  280  may include an NMS transistor directly connected to the metal line  230  in the main region  200  or the first test region  220 , which is connected to the poly-gate line  260 . 
         [0052]    The above described embodiment of the present invention may include the main region  200 , the first test region  220  and the second test region  240  under the assumption that there may be constant need for the first test region  220  for essential test because a lot of test may be classified into essential ones and optional ones depending on various levels including the wafer level and the package level. 
         [0053]    However, depending on types of a semiconductor device, there may be a case where test operations are simplified or no test circuit is required during test operations after initial tests (e.g., the wafer level test). 
         [0054]    Therefore, the semiconductor device in accordance with an embodiment of the present invention may include a normal region including the main region  200  and the first test region  220  and a second test region  240  that may include test circuits for performing test operations that are required only in initial level or the wafer level and not required henceforward. The normal region of the semiconductor device may include circuits required commonly for both of the normal operation and the essential test operation. The second test region  240  may be removed in the course of manufacture of the device after use of the second test region  240  in the initial test. 
         [0055]    In accordance with the above-described embodiment of the present invention, the second test region  240  is removed in the wafer level. That is, the second test region  240  is removed in the course of manufacture of the device after use of the second test region  240  in the wafer level. 
         [0056]    However, the second test region  240  also may be removed in the course of manufacture of the device after use of the second test region  240  in R&amp;D phase of a semiconductor device. For example, a semiconductor device in the R&amp;D phase may require much more test operations than a semiconductor device in a manufacture phase and most of the test operations in the R&amp;D phase may not be required any more in the manufacture phase. 
         [0057]    Unconditionally enlarging auxiliary test region in the semiconductor device of the R&amp;D phase for auxiliary test operations wastes region ineffectively. It is preferable to remove the auxiliary test region such as the second test region  240  of the embodiment of the present invention from the semiconductor device of the R&amp;D phase after use of the auxiliary test region. 
         [0058]    According to the embodiment of the present invention, it may be possible to prevent a semiconductor device, of which test regions dedicated to pre-packaged test may be removed in the course of manufacture of the device, from including unnecessary regions after manufacturing. Further, standby current of the semiconductor device after manufacturing may be minimized. 
         [0059]    Although various embodiments have been described for illustrative purposes, it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.