发明授权
- 专利标题: Apparatus and method for testing the connections between an integrated circuit and a printed circuit board
- 专利标题(中): 用于测试集成电路和印刷电路板之间的连接的装置和方法
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申请号: US661455申请日: 1996-06-11
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公开(公告)号: US5818251A公开(公告)日: 1998-10-06
- 发明人: Amos Intrater
- 申请人: Amos Intrater
- 申请人地址: CA Santa Clara
- 专利权人: National Semiconductor Corporation
- 当前专利权人: National Semiconductor Corporation
- 当前专利权人地址: CA Santa Clara
- 主分类号: G01R31/28
- IPC分类号: G01R31/28 ; G01R31/26
摘要:
Apparatus and method for testing the connection (i.e. solder joint) between an input/output (I/O) pin of an integrated circuit and a conductive trace of a printed circuit board (PCB). The internal circuitry of the integrated circuit is isolated from each I/O pin, and a first voltage source is coupled to each I/O pin via a respective pull-up load resistor. A tester circuit is coupled to each conductive trace of the PCB and compares the voltage V.sub.T thereon with a high threshold level (HTVL) and a low threshold level (LTVL) to test for a proper connection. Voltage V.sub.T is derived for an I/O pin under test when a resistive element, which is part of the tester circuit, is operatively coupled between the corresponding conductive trace and a second voltage source. If V.sub.T is below the LTVL or above the HTVL, the I/O pin is improperly coupled to the conductive trace. If V.sub.T is between the LTVL and HTVL, then the voltage on each of the other traces is compared to the HTVL. If the voltage level of one of the other traces not under test is below the HTVL, then the other I/O pin is electrically shorted to the I/O pin under test.
公开/授权文献
- US4054568A Thiazolo(5,4-f)quinoline-8-carboxylic acid derivatives 公开/授权日:1977-10-18