A port protection circuit to prevent reverse leakage
A protection circuit, reverse leakage technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve the problems of the chip cannot work normally, the port forward working current is large, damage and other problems
Active Publication Date: 2018-06-29
江苏芯力特电子科技有限公司
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Problems solved by technology
However, in actual conditions, the output port may be higher than the chip power supply voltage VDD or lower than 0V, which will cause the port to draw current from the ground terminal or the forward working current is too large, so the chip cannot work normally or even be damaged; Technology has not yet solved such problems
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[0028] The present invention will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments.
[0029] A port protection circuit for preventing reverse leakage, characterized in that it comprises: a resistor, a power supply, a first inverter, a second inverter, a NOR gate, a first PMOS transistor, a second PMOS transistor, a first NMOS transistor tube, the second NMOS tube, the third NMOS tube, the fourth NMOS tube, the fifth NMOS tube, and the sixth NMOS tube;
[0030] The PMOS transistor is an n-type substrate, p-channel, and a MOS transistor that transports current by the flow of holes; the NMOS transistor is a transistor with an N-type metal-oxide-semiconductor structure; the input terminal of the first inverter is connected to the control signal DI and the output end is connected to the input end of the NOR gate; the other input end of the NOR gate is connected to the detection signal CTR and the output end is connected to the ...
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The invention discloses a port protecting circuit capable of preventing inverse current leakage. The port protecting circuit capable of preventing the inverse current leakage comprises a resistor, a power supply, a first phase inverter, a second phase inverter, a NOR gate, a first PMOS transistor, a second PMOS transistor, a first NMOS transistor, a second NMOS transistor, a third NMOS transistor, a fourth NMOS transistor, a fifth NMOS transistor and a sixth NMOS transistor. According to the port protecting circuit capable of preventing the inverse current leakage, when a voltage of the output end of the protecting circuit is lower than 0 V, the current is effectively prevented from inversely flowing out of an output port from the ground, and meanwhile when the voltage of the output end is higher than a power supply VDD, the large current is prevented from damaging a chip, and thus the service life of the chip is guaranteed.
Description
technical field [0001] It relates to the field of integrated circuits, in particular to a port protection circuit. Background technique [0002] The output ports of traditional integrated circuits such as figure 2 As shown, in normal operation, the PMOS tube and NMOS tube are controlled by the signal DI to drive the external load, and the voltage of the output ports A and B should be between the power supply voltage VDD and 0V. However, in actual conditions, the output port may be higher than the chip power supply voltage VDD or lower than 0V, which will cause the port to draw current from the ground terminal or the forward working current is too large, so the chip cannot work normally or even be damaged; Technology has not yet solved such problems. Contents of the invention [0003] In order to solve the deficiencies in the prior art, the object of the present invention is to provide a port protection circuit for preventing reverse leakage; this protection circuit effec...
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IPC IPC(8): G05F1/569
CPCG05F1/569
Inventor 金湘亮张文杰谢亮周维瀚
Owner 江苏芯力特电子科技有限公司