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CD40109B无输出

Other Parts Discussed in Thread: CD40109B

现用CD40109B做电平抬升输出,3.3V to 15V,VCC供电+3.3V,VDD供电+15V;测试时,使能信号EN一直为高电平3.3V,输入为占空比50%,周期30us的方波信号,芯片输入信号正常,但无输出信号。已尝试换芯片,但问题依然存在