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SN74LVC2G08的问题

Other Parts Discussed in Thread: SN74LVC2G08

   这是一个双与门,在测试的过程中发现一个奇怪的问题,3.3V供电时,逻辑运算的结果有错误,原理图如下:

经常出现的是,当左边输入A=1,B=1时,与门输出引脚3、7开始都输出=0,过一会全部都会调成1.

换了几个SN74LVC2G08都是这样,A、B是直接DSP输出的,现在不知道究竟问题出在哪里?

能否请TI的专家,指点一下!