An input interface circuit for chip enable control

Abstract

An input interface circuit for chip enable control, comprising a hysteresis circuit and a pulse filter circuit, the hysteresis circuit filters out noise signals in a hysteresis window through a hysteresis comparator with a symmetrical structure up and down; the pulse filter circuit passes through a first PMOS transistor, The first NMOS tube, the first current source, the first capacitor, the second PMOS tube, the second NMOS tube, the second current source and the second capacitor form a pulse filter preprocessing circuit to preprocess the short pulse interference signal, and then obtain The signal of the NOR gate is sent to the first NOR gate and the second NOR gate to form the NOR RS flip-flop, and the characteristic that the output remains unchanged when the input at both ends of the NOR RS contactor is 0 at the same time is used to filter out unnecessary short For pulse interference signals, short pulse interference signals with different pulse widths can be filtered out by adjusting the size of the current source and the size of the capacitor. The invention can restore the external enable control signal of the chip, thereby normally controlling the chip, preventing the chip from being turned off or turned on by mistake, and ensuring the normal operation of the system where the chip is located.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, and in particular relates to an input interface circuit used for chip enable control. Background technique [0002] In today's information and digital society, electronic information technology is developing rapidly. Due to the uncontrollability and low reliability of traditional circuits, more and more intelligent circuit systems are replacing traditional circuits. As the core of the intelligent circuit system, the chip usually needs to have an enabling control terminal in order to cooperate with the normal operation of the entire circuit system. Enable control, in short, is to turn on or turn off a chip with a certain function according to the needs of the intelligent circuit system. The chip is controlled by an intelligent circuit system, which can improve the reliability of the entire system. At the moment when the chip is turned on and off, due to environmental interference, th...

AI Technical Summary

Problems solved by technology

At the moment when the chip is turned on and off, due to environmental interference, the enable control signal is usually subject to noise interference and pulse interference, causing the chip to be triggered to turn on or off by mistake, resulting in the collapse of the system where the chip is located. Therefore, the designed chip enable control The input interface circuit is particularly important

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