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https://e2e.ti.com/support/clock-timing-group/clock-and-timing/f/clock-timing-forum/755736/tlc555-tlc555-output-3-foot-problem
变压器后的 VCC 16V 输入、产生冲击，-1V 的负电压将注入外切支脚、长期使用以及是否会损坏芯片主体。 输出电压允许的范围是多少？
