Reinforced ESD protection for NC-pin adjacent input pin

Details Reinforced ESD protection for NC-pin adjacent input pin Reinforced ESD protection for NC-pin adjacent input pin

1996-06-11

1998-10-06

Saadat, Mahshid D.

Active solid-state devices (e.g., transistors, solid-state diode

Field effect device

Having insulated electrode

257546, 257174, H01L 2974, H01L 31111, H01L 2362, H01L 2900

Patent

active

058180869

ABSTRACT:
In accordance with the invention, an integrated circuit has a first ESD protection circuit for each input pin which is not adjacent a non-wired IC pin and a second ESD protection circuit for each input pin which is adjacent a non-wired pin. The second ESD protection circuit has a greater ESD protection capability than the first ESD protection circuit. The second ESD protection circuit has a capability of protecting an input pin when an ESD stress occurs at an adjacent non-wired pin. The second ESD protection circuit includes, for example, additional ESD protection elements in comparison to the first ESD protection circuit. Alternatively, the second ESD protection circuit has one ESD protection element which is larger in size or is otherwise different than a corresponding ESD protection element in the first ESD protection circuit. The invention has the advantage of not changing the definition of the non-wired IC pins and also does not cost large amounts of chip real estate because the ESD protection circuit is reinforced for only those input pins which are adjacent non-wired pins. The ESD protection circuit is not reinforced for I/O pins, VDD pins, VSS pins, and input pins which are not adjacent non-wired pins.

REFERENCES:
patent: 5355344 (1994-10-01), McClure
patent: 5465189 (1995-11-01), Polgreen et al.
patent: 5610425 (1997-03-01), Quigley et al.

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