According to the property that the capacitor voltage will not change suddenly, the rising edge of Uc 1 will slow down, that is, the level of logic 1 will be moved back. 74HC 14 is an inverter with Schmidt input, and the two-stage series logic remains unchanged.

HC 14 is a high-speed CMOS device, and its pin 74HC 14 is compatible with low-power Schottky TTL(LSTTL) series. 74HC 14 follows JEDEC standard 7A. 74HC 14 has realized six Schmitt-triggered inverters, which can convert slowly changing input signals into clear and jitter-free output signals.

Until (1) reaches L, the potential of each point is reversed, and the charging current is reversed, thus repeatedly forming an impact. It can be seen that the oscillation frequency is determined by RC 1 R3 and C2 are difference channel active low, and the carry pulse is active high. RC3 is a high-level activated difference channel, and a low-level activated reset pulse.

HC 14 is a high-speed CMOS device. Its pins are compatible with low-power Schottky TT 1( 1STT 1) series, and a 6-channel Schmitt-triggered inverter is realized, which can convert slowly changing input signals into clear and jitter-free output signals. It can be applied to waveform, pulse shaper, unstable multivibrator, monostable multivibrator and so on.