Integrated circuit that prevents backflow of current into the power line

Abstract

The invention provides an integrated circuit capable of preventing a current from flowing backwards to a power line. The integrated circuit comprises an input circuit having a bonding pad and a boost circuit. The boost circuit comprises a boost switch, a bulk control switch and a control circuit. The boost switch comprises a first control end and a first bulk and is used for making the bonding pad electrically connected to the power line. The bulk control switch comprises a second control end and a second bulk and is used for making the first bulk and the second bulk connected to the power line. The control circuit is electrically connected to the power line and the bonding pad and controls the first control end and the second control end according to one internal signal, one source voltage of the power line and one bonding pad voltage of the bonding pad. When the source voltage is a preset voltage, the control circuit makes the bulk control switch on. When the source voltage is a grounding voltage and the bonding pad voltage is a preset voltage, the control circuit controls the bulk control switch and the boost switch to be off.

Description

technical field [0001] The present invention relates to an input circuit of an integrated circuit, in particular to an input circuit capable of preventing backflow of current. Background technique [0002] Communication between electronic products can be achieved through physical transmission lines and special communication specifications. Generally speaking, an integrated circuit responsible for providing signals can be called a source integrated circuit (source IC), and an integrated circuit that receives signals through a transmission line can be called a sink IC. [0003] Many communication standards use differential signals for communication, which can achieve a relatively high transmission speed of communication signals. However, for high-speed communication, the receiving-end integrated circuit often needs to be equipped with a terminal resistor to reduce signal reflection and increase transmission speed. For example, a terminator can be provided in the receiver int...

AI Technical Summary

Problems solved by technology

However, in practice, the power line of the signal source integrated circuit may pour current into the power line of the receiving end integrated circuit through the transmission line and the terminal resistor of the receiving end integrated circuit, making its voltage greater than 0V

Such a current backflow phenomenon may cause some default values ​​of the receiving-end integrated circuit to be wrong when the power of the electronic device where the receiving-end integrated circuit is located is turned on again.

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