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    • 10. 发明授权
    • Semiconductor device test circuit having test enable circuitry and test
mode-entry circuitry
    • 具有测试使能电路和测试模式进入电路的半导体器件测试电路
    • US5596537A
    • 1997-01-21
    • US275700
    • 1994-07-14
    • Shunichi SukegawaShiyuzo ShiozakiHiromi MatsuuraMasaya Muranaka
    • Shunichi SukegawaShiyuzo ShiozakiHiromi MatsuuraMasaya Muranaka
    • G11C29/00G11C29/14G11C29/46G11C7/00
    • G11C29/46
    • A semiconductor device test circuit for inclusion on a semiconductor chip having a semiconductor device thereon, wherein a test mode with respect to the semiconductor device is not entered during normal use of the semiconductor device and the test mode can be entered without applying a voltage higher than the power supply voltage to an external terminal of the semiconductor device. The test circuit includes a decoder circuit which detects the matching of a first address input corresponding to a test mode, and a latch circuit which latches the signal indicating the matching of the first address input with a test mode. A second decoder circuit then detects the matching of a second address to the test mode, the second address being input when the matching signal for the first address has been latched. A second latch circuit latches the signal indicating the matching of the second address. A third address input is processed by a third decoder circuit and a third latch circuit in the same way. This means that when a plurality of addresses (three addresses in the described example) which are consecutively input to the respective decoder circuits are in a predetermined, specific combination, a test enable signal is output and the test mode is activated.
    • 一种用于包含在其上具有半导体器件的半导体芯片上的半导体器件测试电路,其中在半导体器件的正常使用期间不进入相对于半导体器件的测试模式,并且可以进入测试模式而不施加高于 对半导体器件的外部端子的电源电压。 测试电路包括检测与测试模式相对应的第一地址输入的匹配的解码器电路和锁存指示第一地址输入与测试模式匹配的信号的锁存电路。 第二解码器电路然后检测第二地址与测试模式的匹配,当第一地址的匹配信号被锁存时,第二地址被输入。 第二锁存电路锁存指示第二地址匹配的信号。 第三地址输入由第三解码器电路和第三锁存电路以相同的方式处理。 这意味着当连续输入到各个解码器电路的多个地址(所述示例中的三个地址)处于预定的特定组合时,输出测试使能信号并且测试模式被激活。