Patent ID: 11862965
Assignee: CHANGXIN MEMORY TECHNOLOGIES, INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An electrostatic discharge protection circuit, a chip comprising a first pad and a second pad, wherein the electrostatic discharge protection circuit comprises:
a trigger unit, connected between the first pad and the second pad, provided with a trigger terminal, and configured to generate a trigger signal when there is an electrostatic pulse on the first pad, wherein the first pad is connected to a first voltage, the second pad is connected to a second voltage, and the first voltage is greater than the second voltage;
a discharge transistor, having a control terminal connected to the trigger terminal, a first terminal connected to the first pad, a second terminal connected to the second pad, and a substrate terminal connected to the control terminal of the discharge transistor, and the discharge transistor configured to discharge an electrostatic charge to the second pad when triggered by the trigger signal, to pull a voltage at the substrate terminal of the discharge transistor to the first voltage or the second voltage; and
a control unit, provided with a control terminal connected to the trigger terminal of the trigger unit; the control unit comprising a protection transistor and an inverter, the protection transistor provided with a control terminal, a first terminal and a second terminal, an input terminal of the inverter used as the control terminal of the control unit, an output terminal of the inverter connected to the control terminal of the protection transistor;
wherein,
the discharge transistor and the protection transistor are both N-type transistors, the first terminal of the protection transistor different from the control terminal of the protection transistor is connected to the trigger terminal, and the second terminal of the protection transistor is connected to the second pad, or
the discharge transistor and the protection transistor are both P-type transistors, the first terminal of the protection transistor different from the control terminal of the protection transistor is connected to the trigger terminal, and the second terminal of the protection transistor is connected to the first pad.