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NE555: 请问用5V给NE555供电,输出信号的高电平是5V吗,还是3.3V

Part Number: NE555

1. 请问用5V给NE555供电, 做一个PWM信号发生器,NE555输出信号的高电平是5V吗,还是3.3V.

2. 第5脚可以悬空吗。