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关于SN74HC08的逻辑阈值问题，综合数据手册（第6.5节）与实测验证，关键结论如下：
阈值定义（Vcc=5V时）
逻辑1：输入电压 ≥3.15V（非标准CMOS的2.5V，因抗噪结构优化）
逻辑0：输入电压 ≤1.35V
风险区间：1.35V~3.15V（输出状态不可控）
