Protective device for an integrated circit and manufacturing met

Details Protective device for an integrated circit and manufacturing met Protective device for an integrated circit and manufacturing met

1995-03-24

1996-10-15

Thomas, Tom

Fishing, trapping, and vermin destroying

437 60, 437 30, H01L 2974

Patent

active

055653677

ABSTRACT:
A protective device for an integrated circuit and the manufacturing method thereof is disclosed in which a floating well is formed in a substrate by implanting first conductivity-type impurity into the substrate. The substrate is a second conductivity-type substrate. A diffusion resistor is formed in the well by implanting second conductivity-type impurity into the well. The diffusion resistor has a first terminal to be connected electrically to the driving circuit stage and a second terminal to be connected electrically to the driven circuit stage. A grounded region is formed in the well around the diffusion resistor by implanting second conductivity-type impurity into the well, and by applying a ground reference voltage to the grounded region. The diffusion resistor, the well and the grounded region cooperatively define thereamong a diac region which prevents large current flows from the driving circuit stage to the driven circuit stage when a relatively large voltage is present at the first terminal of the diffusion resistor.

REFERENCES:
patent: 4609931 (1986-09-01), Koke
patent: 4617482 (1986-10-01), Matsuda
patent: 5148250 (1992-09-01), Winnerl et al.
patent: 5158899 (1992-10-01), Yamagata
patent: 5359211 (1994-10-01), Groft
patent: 5432368 (1995-07-01), Timenez
patent: 5485024 (1996-01-01), Reay
patent: 5508548 (1996-04-01), Tailliet

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