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Protection circuit

A technology for protecting circuits and collectors, applied in circuits, electrical components, electric solid devices, etc., can solve problems such as damage to integrated circuits, silicon integrated circuits that cannot be used, and circuits that do not provide protection

Inactive Publication Date: 2004-01-21
WINBOND ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, this protection circuit has a high hold voltage which can potentially damage the integrated circuit when the power consumption during enable will be high
In addition, the circuit does not provide protection when an electrostatic discharge event occurs between two circuit terminals (such that the circuit can only be connected between the circuit terminal and the substrate).
[0009] As yet another example, U.S. Patent No. 5,392,185 discloses a silicon controlled rectifier; however, it can only be applied to GaAs materials, and it cannot be applied to silicon integrated circuit manufacturing processes

Method used

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Embodiment Construction

[0047]Apparatus and methods consistent with the present invention provide on-chip protection circuits with adjustable holding voltages for preventing integrated circuits (ICs) from damage due to increased operating voltages and also for protecting against Accidental triggering of circuits.

[0048] A protection circuit consistent with the present invention includes a voltage divider coupled to a silicon controlled rectifier (SCR), which may be coupled to an integrated circuit (IC). The protection circuit protects the IC from voltage spikes due to external overshooting events (EOS) on the IC, which can damage the IC. The protection circuit also prevents the IC from accidentally triggering the SCR due to, for example, noise on the IC (which may occur if the trigger voltage is too low), and further prevents SCR latch-up (which may result from the low operating voltage of the SCR).

[0049] The voltage divider of the protection circuit enables the trigger voltage, the trigger cur...

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Abstract

The protection circuit for protecting IC against peak voltage includes one voltage divider coupled to a SCR. The voltage divider can be used to regulate the trigger voltage, trigger current and holdvoltage of the protection circuit, so that after some specific potential is applied to the protection circuit, the protection circuit will conduct current to prevent the IC in normal operation from abnormal conducting caused by noise.

Description

technical field [0001] The present invention relates generally to protection circuits for semiconductor integrated circuits, and more particularly to protection circuits for protection against electrostatic discharge and external overshooting events (EOS) on integrated circuits. Background technique [0002] Integrated circuits are sensitive components that can be damaged by high peak currents or voltages resulting from external high-override events. An extrinsic high overshoot event on an integrated circuit causes a sudden increase in voltage due to an external source discharging a large instantaneous voltage to the terminals of the integrated circuit during a short period of time. Such events may include, for example, electrostatic discharge events resulting from human body contact with integrated circuits or glitches when power is turned on. [0003] Damage can be prevented by coupling a protection circuit to the integrated circuit, which is enabled when the operating vo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L23/60H01L23/62H01L27/02
CPCH01L27/0251
Inventor 邱福千陈伟梵
Owner WINBOND ELECTRONICS CORP
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