ESD protection circuit for integrated circuits having a bipolar

Details ESD protection circuit for integrated circuits having a bipolar ESD protection circuit for integrated circuits having a bipolar

1997-11-26

1999-01-19

Gaffin, Jeffrey

Electricity: electrical systems and devices

Safety and protection of systems and devices

Transient responsive

361 56, H02H 322

Patent

active

058620311

ABSTRACT:
An ESD protection circuit allows a certain level of ESD current to flow through a protected circuit, and actuates a bypass path for greater ESD current levels when the sensed current reaches a threshold level. For a protected circuit having a pair of differential input terminals and a reference voltage terminal, the bypass path is provided between an input terminal which receives an ESD and the reference voltage terminal when the reference voltage is fixed, and between the two input terminals when the reference voltage is floating. The bypass circuit is preferably implemented with a pair of bipolar transistors of a first conductivity that are actuated by an ESD current flow through the protected circuit, and a pair of bipolar transistors of opposite conductivity that are actuated by current flows through the first conductivity transistors.

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