Скачать или смотреть Digital Pins Are Amplifiers - What TTL And CMOS Invalid Voltages Really Are - Simply Put

Why is there a central range of invalid voltage between 'high' and 'low', instead of there just being a single switch point? Why is it important that digital inputs (especially clock inputs) switch rapidly? Because, despite being a digital chip that is supposed to operate only in a digital manner, transistors of all kinds still are fundamentally analog devices, and operating them in an analog manner can mess up an entire chip's logical process. Also, you could totally use a digital inverter chip as a goofy analog amplifier if you were really careful about it.

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