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SN74AHC1G125

Other Parts Discussed in Thread: SN74AHC1G125

SN74AHC1G125芯片工作一段时间后, 输入端PWM时,没有了输出, 而且输出一直保持高电平, 同时SN74AHC1G125发出滋滋的响声, 经测试其自身工作电流变大, 最高可以达到4Ma.  有一点就是输出端是经过一根2m的导线连接到另外的一个板子上, 并且输出端连接外部没有做任何的保护措施, 想问下这个芯片是坏掉了吗?是怎么坏掉的?