The monostable circuit has only one stable state. After triggering the flip, it will return to the original stable state after a period of time. Generally, fixed pulse width shaping is performed. Unlike a bistable circuit, a monostable flip-flop has only one stable state, which is either 0 or 1. The working characteristics of the monostable trigger are: (1) The monostable trigger remains in a stable state when it is not affected by an external trigger pulse; (2) When it is affected by an external trigger pulse, the monostable trigger The flip-flop flips over and enters a "temporary steady state". Assuming that the steady state is 0, the temporary steady state is 1. (3) After a period of time, the monostable trigger returns from the temporary stable state to the stable state. The time the monostable flip-flop stays in the transient state depends only on the parameters of the circuit itself.