Novel power-on and power-off reset circuit

Abstract

The invention discloses a novel power-on and power-off reset circuit, and the circuit comprises: a power-on threshold control main circuit which is used for controlling the power-on threshold of a PORcircuit; a power-off reset control circuit which can realize quick response during power-off and generate a POR reset signal; a quick power-on response circuit which can realize quick response duringquick power-on; an NM0 turn-off latch circuit which turns off a first MOS transistor in the power-on threshold control main circuit in a standby state and cuts off the direct current channel of the power-on threshold control main circuit; an output circuit which is used for logic control of an output end; and a quick-response capacitor discharge circuit which is used for controlling a fourth capacitor in the fast power-on response circuit to discharge after quick power-off so as to ensure fast power-on response. According to the technical scheme, quick power-on, quick power-off, slow power-onand slow power-off conditions can be well considered, and meanwhile, through logic control, a direct-current path is switched off in a standby state, so that extremely low current consumption can beachieved.

Description

technical field [0001] The invention relates to the technical field of semiconductor integrated circuits, in particular to a novel power-on and power-off reset circuit. Background technique [0002] Among the common power-on and power-off reset circuits, none of them can take into account the situations of fast power-on, fast power-off, slow power-on and slow power-off. even higher. [0003] Generally, the typical power-on reset circuits are as follows: [0004] The first is a simple RC reset circuit, such as figure 1 shown. When VCC is powered on, C0 is charged, the voltage at point a rises to the threshold voltage, the inverter flips, the reset signal POR is released, the flip is 0, and the reset is successful. When the circuit is powered off, the POR signal is always 0, which cannot be effectively reset. [0005] The second is a sampling comparison circuit, such as figure 2 shown. The resistor R in the figure can be a resistor or a MOS diode, and vref is usually a...

AI Technical Summary

Problems solved by technology

In short, when considering fast power-on, fast power-off, slow power-on, slow power-off, and low power consumption, a variety of power-on reset circuits cannot be well balanced.

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