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SN75452B的数据手册上说：No Output Latch-Up at 20 V (After Conducting 300 mA) 请问这是什么电压？ 关断状态有输出电压吗？
SN75452是NAND的逻辑器件。输出钳位到20V，电流大于300ma, 输出会关断。
此芯片无关断控制，两个输入均为高，则输出低电平。
