阅读说明：本技术 一种端口电路 (Port circuit ) 是由 李耿民 杨卫平 张馨然 刘俊涛 何林飞 于 2019-08-15 设计创作，主要内容包括：本发明涉及一种端口电路,包括多个静电保护电路,多个静电保护电路中至少两个静电保护电路的静电泄放端数量不同,在多个静电保护电路中,目标静电保护电路的电流输入端分别与一个或多个非目标静电保护电路的静电泄放端连接,所述非目标静电保护电路的静电泄放端数量多于所述目标静电保护电路的静电泄放端数量,其中,各所述静电保护电路的实际静电泄放端的数量总和大于各所述静电保护电路的自己的静电泄放端的数量总和。本发明通过将静电泄放端数量少的静电保护电路与静电泄放端数量多的静电保护电路的静电泄放端相连,从而增加了静电泄放端数量,加快了静电泄放速度,有效降低了元器件的损伤,同时操作简便,节约成本。(the invention relates to a port circuit, which comprises a plurality of electrostatic protection circuits, wherein the number of electrostatic discharge ends of at least two electrostatic protection circuits in the plurality of electrostatic protection circuits is different, in the plurality of electrostatic protection circuits, the current input end of a target electrostatic protection circuit is respectively connected with the electrostatic discharge ends of one or more non-target electrostatic protection circuits, the number of the electrostatic discharge ends of the non-target electrostatic protection circuits is more than that of the electrostatic discharge ends of the target electrostatic protection circuit, and the sum of the number of the actual electrostatic discharge ends of each electrostatic protection circuit is more than that of the electrostatic discharge ends of each electrostatic protection circuit. According to the invention, the electrostatic protection circuit with a small number of electrostatic discharge ends is connected with the electrostatic discharge ends of the electrostatic protection circuit with a large number of electrostatic discharge ends, so that the number of electrostatic discharge ends is increased, the electrostatic discharge speed is accelerated, the damage of components is effectively reduced, and meanwhile, the operation is simple and convenient, and the cost is saved.)

1. A port circuit is characterized by comprising a plurality of electrostatic protection circuits, wherein the number of electrostatic discharge ends of at least two electrostatic protection circuits in the plurality of electrostatic protection circuits is different,

In the multiple electrostatic protection circuits, a current input end of a target electrostatic protection circuit is respectively connected with electrostatic discharge ends of one or more non-target electrostatic protection circuits, the number of the electrostatic discharge ends of the non-target electrostatic protection circuits is more than that of the electrostatic discharge ends of the target electrostatic protection circuit, wherein the sum of the actual electrostatic discharge ends of each electrostatic protection circuit is more than that of the electrostatic discharge ends of each electrostatic protection circuit.

2. The port circuit of claim 1, wherein the electrostatic protection circuit is adapted to be connected to a power source.

3. The port circuit of claim 1, wherein the current input terminal of the target esd protection circuit is connected to the esd terminal of the esd protection circuit with the largest number of esd terminals.

4. The port circuit according to claim 3, wherein when there are at least two ESD protection circuits with the largest number of ESD terminals, the current input terminal of the target ESD protection circuit is connected to the ESD terminal of the ESD protection circuit with the closest connection.

5. The port circuit according to claim 1, wherein one end of the esd protection circuit of each esd protection circuit is grounded, and the other end of the esd protection circuit of each esd protection circuit is connected to the current input terminal of its own or another esd protection circuit through one or more interfaces.

6. The port circuit of claim 5, wherein the interfaces of the plurality of electrostatic protection circuits are independent of each other.

7. The port circuit of claim 5, wherein the interfaces of the plurality of ESD circuits are connected to each other two by two via ESD devices.

8. The port circuit of claim 7, wherein said esd protection device comprises two sets of esd diodes with opposite conduction directions, and the two sets of esd diodes are connected in parallel with each other.

Technical Field

The invention relates to the field of circuits, in particular to a port circuit.

background

At present, static electricity generated in a cmos integrated circuit can form a large current exceeding several tens of amperes in a short time, and such a large current directly flows through an electronic device with a conduction current only in the order of microampere or milliamp, which will bring destructive consequences to the electronic device in the cmos integrated circuit, so that an ESD (electrostatic discharge) protection circuit needs to be provided in the cmos integrated circuit.

However, for a plurality of circuits to be protected, it is necessary to provide a plurality of electrostatic protection circuits, for example: for a plurality of power supplies (most of the cmos integrated circuits are digital-analog mixed, that is, include analog circuits and digital circuits, in order to improve the accuracy and stability of the analog circuits, the power supply of the analog circuit and the power supply of the digital circuit are isolated, that is, the power supplies of the analog circuit and the digital circuit are provided separately, in addition, the core circuit inside the chip of the cmos integrated circuit also needs the working voltage, the working voltage of the core circuit inside the chip of the cmos integrated circuit is obtained by converting the analog power supply of the analog circuit through the LDO conversion module inside the chip, so that at least three power supplies exist in a high-performance integrated circuit, that is, the analog power supply, the digital IO power supply and the digital power supply), because the number of the packaging pins of some power supplies is not large, this tends to result in slow drain rates and damage to the low voltage cmos devices of the integrated circuit.

However, in the prior art, the ESD performance is generally improved by increasing the size of the CMOS device in the ESD protection circuit, which is not only complicated, difficult and costly to operate.

Disclosure of Invention

To solve the above technical problem or at least partially solve the above technical problem, the present invention provides a port circuit.

In a first aspect, the present invention provides a power port circuit, a port circuit, comprising a plurality of electrostatic protection circuits, wherein the number of electrostatic discharge terminals of at least two electrostatic protection circuits in the plurality of electrostatic protection circuits is different,

In the multiple electrostatic protection circuits, a current input end of a target electrostatic protection circuit is respectively connected with electrostatic discharge ends of one or more non-target electrostatic protection circuits, the number of the electrostatic discharge ends of the non-target electrostatic protection circuits is more than that of the electrostatic discharge ends of the target electrostatic protection circuit, wherein the sum of the actual electrostatic discharge ends of each electrostatic protection circuit is more than that of the electrostatic discharge ends of each electrostatic protection circuit.

Optionally, the electrostatic protection circuit is adapted to be connected to a power supply.

Optionally, the current input terminal of the target esd protection circuit is connected to the esd terminal of the esd protection circuit with the largest number of esd terminals.

Optionally, when there are at least two esd protection circuits with the largest number of esd terminals, the current input terminal of the target esd protection circuit is connected to the esd terminal of the esd protection circuit with the closest connection distance.

Optionally, one end of the electrostatic discharge end of each electrostatic protection circuit is grounded, and the other end of the electrostatic discharge end of each electrostatic protection circuit is connected to the current input end of the electrostatic protection circuit itself or another electrostatic protection circuit through one or more interfaces.

Optionally, the interfaces of the electrostatic discharge ends of the plurality of electrostatic protection circuits are independent of each other.

Optionally, the interfaces of the electrostatic discharge ends of the plurality of electrostatic protection circuits are communicated with each other pairwise through electrostatic protection devices.

Optionally, the electrostatic protection device includes two sets of electrostatic diodes with opposite conduction directions, and the two sets of electrostatic diodes are connected in parallel with each other.

Compared with the prior art, the technical scheme provided by the embodiment of the invention has the following advantages:

The circuit provided by the embodiment of the invention comprises a plurality of electrostatic protection circuits, the number of electrostatic discharge ends of at least two electrostatic protection circuits in the plurality of electrostatic protection circuits is different, in the plurality of electrostatic protection circuits, the current input end of a target electrostatic protection circuit is respectively connected with the electrostatic discharge ends of one or more non-target electrostatic protection circuits, the number of the electrostatic discharge ends of the non-target electrostatic protection circuits is more than that of the electrostatic discharge ends of the target electrostatic protection circuit, and the sum of the number of the actual electrostatic discharge ends of each electrostatic protection circuit is more than that of the electrostatic discharge ends of each electrostatic protection circuit. According to the invention, the electrostatic protection circuit with a small number of electrostatic discharge ends is connected with the electrostatic discharge ends of the electrostatic protection circuit with a large number of electrostatic discharge ends, so that the number of electrostatic discharge ends is increased, the electrostatic discharge speed is accelerated, the damage of components is effectively reduced, and meanwhile, the operation is simple and convenient, and the cost is saved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a power port circuit according to an embodiment of the present invention;

fig. 2 is a structural diagram of an electrostatic protection circuit of a power port circuit according to an embodiment of the present invention;

Fig. 3 is a detailed structural diagram of a power port circuit according to another embodiment of the invention;

Fig. 4 is a specific structural diagram of a power port circuit before improvement.

100, a target electrostatic protection circuit; 200. a non-target electrostatic protection circuit.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

In the prior art, the ESD performance is generally improved by increasing the size of the CMOS device in the ESD protection circuit, which is not only complicated and difficult to operate, but also has high cost. To this end, an embodiment of the present invention provides a port circuit, as shown in fig. 1, including a plurality of esd protection circuits, in which at least two esd protection circuits in the plurality of esd protection circuits have different numbers of esd terminals,

In the multiple electrostatic protection circuits, a current input end of a target electrostatic protection circuit is respectively connected with electrostatic discharge ends of one or more non-target electrostatic protection circuits, the number of the electrostatic discharge ends of the non-target electrostatic protection circuits is more than that of the electrostatic discharge ends of the target electrostatic protection circuit, wherein the sum of the actual electrostatic discharge ends of each electrostatic protection circuit is more than that of the electrostatic discharge ends of each electrostatic protection circuit.

In this embodiment, the electrostatic protection circuit is adapted to be connected to a power supply.

In this embodiment, the target ESD protection circuit 100 is an ESD protection circuit that needs to be improved, except for any one of the ESD protection circuits with the largest number of ESD terminals, and for example, the ESD protection circuit is connected to a power supply, and the cmos integrated circuit at least includes an analog power supply, a digital power supply and a digital IO power supply, where the analog power supply is an operating power supply of the analog circuit provided from the outside, the digital power supply is an internal operating power supply of the cmos integrated circuit, and the digital IO power supply is an operating power supply of the digital circuit, and the ESD terminals of the ESD protection circuit connected to the digital power supply are mostly used for testing, and the number of packages is small, so that ESD performance is poor, and low-voltage devices inside the chip are easily damaged by electrostatic current, so that the ESD protection circuit of the digital power supply needs to be improved.

In this embodiment, the electrostatic discharge end may be a pin of a package outside the chip, through which the electrostatic current is discharged.

In this embodiment, the target esd protection circuit 100 may connect the current input terminal to any one of the esd protection circuit's more than the target esd protection circuit 100. For example, there are 5 electrostatic protection circuits, namely electrostatic protection circuits A, B, C, D and E respectively, wherein the electrostatic protection circuit a and the electrostatic protection circuit B are used as the target electrostatic protection circuit 100, the number of electrostatic discharge ends thereof is smaller than that of the power supplies C, D and E, the number of electrostatic discharge ends of the electrostatic protection circuit a is smaller than that of the electrostatic discharge ends of the electrostatic protection circuit B, then the current input end of the electrostatic protection circuit a may be connected to the electrostatic discharge end of any one of the electrostatic protection circuits B, C, D or E, and then the electrostatic discharge is discharged through the electrostatic discharge end of the electrostatic protection circuit B, C, D or E, and the current input end of the electrostatic protection circuit B may be connected to the electrostatic discharge end of any one of the electrostatic protection circuits C, D or E to discharge the electrostatic discharge.

The circuit provided by the embodiment of the invention comprises a plurality of electrostatic protection circuits, the number of electrostatic discharge ends of at least two electrostatic protection circuits in the plurality of electrostatic protection circuits is different, in the plurality of electrostatic protection circuits, the current input end of a target electrostatic protection circuit is respectively connected with the electrostatic discharge ends of one or more non-target electrostatic protection circuits, the number of the electrostatic discharge ends of the non-target electrostatic protection circuits is more than that of the electrostatic discharge ends of the target electrostatic protection circuit, and the sum of the number of the actual electrostatic discharge ends of each electrostatic protection circuit is more than that of the electrostatic discharge ends of each electrostatic protection circuit. According to the invention, the electrostatic protection circuit with a small number of electrostatic discharge ends is connected with the electrostatic discharge ends of the electrostatic protection circuit with a large number of electrostatic discharge ends, so that the number of electrostatic discharge ends is increased, the electrostatic discharge speed is accelerated, the damage of components is effectively reduced, and meanwhile, the operation is simple and convenient, and the cost is saved.

The overall configuration of the circuit according to the present invention is explained above, and the detailed configuration of the circuit according to the present invention is explained below with reference to the embodiments.