Electrostatic protection circuit
AssigneeChangxin Memory Technologies, Inc.
InventorQian Xu
Life of this patent
Estimating the term…
Abstract
An electrostatic protection circuit connected with an internal circuit is provided. The electrostatic protection circuit includes: a first circuit, a first diode connected in parallel with the first circuit, a second circuit, and a second diode connected in parallel with the second circuit. The first circuit is connected between a power supply pad and an internal circuit input terminal. The second circuit is connected between the internal circuit input terminal and a ground pad. The first circuit and the second circuit are diode-triggered silicon controlled rectifier circuits. The technical solution of the disclosure can improve electrostatic protection capability of a charged device model of a chip.
Claims16
An electrostatic protection circuit, connected with an internal circuit and comprising:
- a first circuit, a first diode connected in parallel with the first circuit, a second circuit, and a second diode connected in parallel with the second circuit, wherein
- the first circuit is connected between a power supply pad and an internal circuit input terminal, and the second circuit is connected between the internal circuit input terminal and a ground pad;
- the first circuit comprises at least two third diodes, the second circuit comprises at least two fourth diodes, and the number of the third diodes and the number of the fourth diodes are adjusted such that conduction voltages of the first circuit and the second circuit are greater than an operating voltage of an input pad and less than a breakdown voltage of an electronic device connected to the internal circuit input terminal;
- and
- the first circuit and the second circuit are diode-triggered silicon controlled rectifier (DTSCR) circuits.
Dependencies are inferred from the claim text.