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A kind of pull-up circuit for io circuit

A circuit and power supply technology, applied in logic circuits, logic circuit coupling/interfaces using field effect transistors, logic circuit interface devices, etc., can solve problems affecting the normal output of IO circuits

Active Publication Date: 2021-06-08
SEMICON MFG INT (SHANGHAI) CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is that the existing pull-up circuit used for IO circuits based on fail-safe applications or IO port voltages is higher than the IO power supply voltage input under normal operation. The problem that the pull-up voltage is less than the minimum value specified by the IO logic output high voltage affects the normal output of the IO circuit

Method used

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  • A kind of pull-up circuit for io circuit
  • A kind of pull-up circuit for io circuit
  • A kind of pull-up circuit for io circuit

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Embodiment Construction

[0030] It will be understood by those skilled in the art that existing pull-up circuits for IO circuits are generally adopted figure 1 The circuit structure shown. in figure 1 In the circuit configuration shown, M1 is an NMOS tube, M2 is a PMOS tube, and the REN is a pull-up control signal, NET1 is a node 1 and is used to connect the source of the NMOS tube M1 and the drain of the PMOS tube M2. according to figure 1 The circuit structure shown is in the failure protection mode (e.g., the voltage value Vddio of the IO power source is suddenly down, and the voltage value of the IO port signal is a logic high), or the input signal voltage value of the IO port is higher than normal. When the voltage value VDDIO of the IO power supply under the work, even if the NMOS tube M1 is turned on, the voltage value of the NET1 is still smaller than the threshold voltage of the IO supply voltage, ensuring that the PAD to IO power from the IO port will not occur. The inverted current appears. How...

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Abstract

A pull-up circuit for an IO circuit, comprising: an access control module and a pull-up module, connected in series between an IO port and an IO power supply; a switch module, which generates an access control signal according to an IO port signal and a first interface signal, when the IO When the port is input or floating, the voltage value of the IO port signal is equal to the first interface signal, and the access control signal is greater than or equal to the difference between the IO port signal and the preset threshold voltage; the access control module is controlled by the access control signal and the second interface signal When it is turned off or turned on, the voltage value of the second interface signal is equal to the larger one of the voltage value of the IO power supply and the voltage value of the IO port signal. Through the technical scheme of the present invention, when the signal voltage value of the IO port is greater than the voltage value of the IO power supply, it can effectively prevent the current from flowing backward from the IO port to the IO power supply; when the IO port is floating, it is easier to satisfy the potential at the IO port can be pulled up to always be greater than the minimum IO logic output high voltage requirement.

Description

Technical field [0001] The present invention relates to the field of integrated circuits, and more particularly to a pull-up circuit for an IO circuit. Background technique [0002] The vertical use of the IO circuit as the input / output interface (IO) circuit as an input / output interface (IO) circuit is increasingly applied to the IO circuit to provide an input / output high level value of the IO circuit. In a typical IO circuit, the IO port (PAD) voltage is typically smaller than the voltage value (VDDIO) of the IO power source, and the pull-up circuit is generally connected to the input side of the IO port PAD to pull the voltage value of the IO port signal. The voltage value of the IO power supply of the IO circuit is equal. In practical applications, if the input voltage of the IO port PAD is greater than the voltage value of the IO power source, or the IO supply voltage suddenly powered up, there is still potential on the IO port PAD, which is easy to generate the PAD to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K19/0185H03K19/0175
CPCH03K19/017509H03K19/018521
Inventor 耿彦陈捷马晓媛
Owner SEMICON MFG INT (SHANGHAI) CORP
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