Non-breakdown triggered electrostatic discharge protection circu

Details Non-breakdown triggered electrostatic discharge protection circu Non-breakdown triggered electrostatic discharge protection circu

1996-09-03

1998-07-14

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361111, H02H 900

Patent

active

057813884

ABSTRACT:
A non-breakdown triggered electrostatic discharge (ESD) protection circuit (11) having a voltage divider circuit and a SCR (22) protects an integrated circuit from an ESD event. The voltage divider includes a capacitor (17) and a resistor (18). The voltage divider connects to a pad of an integrated circuit and generates a trigger voltage for enabling the SCR (22) when an ESD event is applied to the pad. A worst case ESD voltage transient is used to calculate a trigger voltage for the SCR (22). The trigger voltage is selected at a voltage below where damage to the integrated circuit occurs. The SCR (22) is designed to have a turn on time constant that prevents normal signal levels from triggering the SCR (22).

REFERENCES:
patent: 5400202 (1995-03-01), Metz et al.
patent: 5528188 (1996-06-01), Au et al.

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