Wide-range input/output interface circuit

Abstract

The invention discloses a wide-range input-output interface circuit, and belongs to the field of integrated circuits. Under the condition that the output driving unit (101) serves as an output interface, the gate-source voltage of a PMOS transistor in the output driving unit (101) is equal to the voltage of a kernel working power supply through the dual-mode level conversion unit by means of opening and closing of the auxiliary voltage generation unit (103). Under the condition that a voltage-withstanding input buffer unit (104) is used as an input interface, the gate-source voltage of the PMOS transistor in the voltage-withstanding input buffer unit (104) is enabled to be equal to the power supply voltage of the input / output interface by utilizing the opening and closing of the auxiliaryvoltage generation unit (103) and the opening and closing of the voltage-withstanding input buffer unit (104) and the voltage-withstanding input buffer unit.

Description

technical field [0001] The invention relates to a wide-range input-output interface circuit, in particular to an input-output interface circuit optimized for application requirements of programmable logic devices and capable of adapting to various power supply voltages, belonging to the field of integrated circuits. Background technique [0002] Programmable logic devices have the advantages of high flexibility, low cost, and short cycle time. They can greatly shorten the product development cycle and minimize risks. They have become core components in the integrated circuit industry. The programmable logic device includes two kinds of power supply, one is the core working power supply, for the overall circuit performance and power consumption, the core working power supply works under a fixed power supply voltage, and the other is the input and output interface power supply, which acts as a programmable logic device The communication function with other devices needs to be ...

AI Technical Summary

Problems solved by technology

[0003] The traditional input and output interface circuits are designed for a specific power supply voltage. For the structure of the input and output interface power supply voltage higher than the core operating voltage, when the input and output interface power supply voltage is lower than the core operating voltage, due to the The operating voltage is much lower than the typical operating voltage, making its performance unsatisfactory

For the structure whose input and output interface power supply voltage is lower than the core operating voltage, limited by the operating voltage and reliability of transistor devices, it cannot work when the input and output interface power supply voltage is higher than the core operating voltage

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