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CD4013B: 关于CD4013B的时钟问题

Part Number: CD4013B

请问CD4013B的CLOCK管脚所接的时钟信号在芯片供电为15V时需要达到多少伏才能被识别为上升沿?

CD4013B的CLOCK管脚的逻辑高阈值与供电电压有关吗?我在实际实验的过程中,CD4013采用15V供电,而CLOCK管脚采用5V的TTL电平,发现电路的输出不正常,请问是否为CLOCK管脚电压过低导致?