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SN74TVC3306 电平转换 为什么会有直流分量叠加

Other Parts Discussed in Thread: SN74TVC3306

你好!我使用SN74TVC3306 时发现 电平转换后有直流分量叠加 并且输入3.3V LVTTL也会收到干扰出现直流分量叠加 波形如下:

使用电路:

FPGA IO设置:

为什么?会这样???