ESD bus lines in CMOS IC's for whole-chip ESD protection

Details ESD bus lines in CMOS IC's for whole-chip ESD protection ESD bus lines in CMOS IC's for whole-chip ESD protection

1998-12-15

2000-11-07

Ballato, Josie

Electricity: electrical systems and devices

Safety and protection of systems and devices

Transient responsive

361 56, H02H 322

Patent

active

061445428

ABSTRACT:
In this invention, a new whole-chip ESD protection scheme with the ESD buses has been proposed to solve the ESD protection issue of the CMOS IC having a large number of separated power lines. Multiple ESD buses, which are formed by the wide metal lines, have been added into the CMOS IC having a large number of separated power lines. The bi-directional ESD-connection cells are connected between the separated power lines and the ESD buses, but not between the separated power lines. The ESD current on the CMOS IC with more separated power lines are all conducted into the ESD buses, therefore the ESD current can be conducted by the ESD buses away from the internal circuits and quickly discharged through the designed ESD protection devices to ground. By using this new whole-chip ESD protection scheme with the ESD buses, the CMOS IC having more separated power lines can be still safely protected against ESD damages.

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