Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific voltage responsive fault sensor
Patent
1994-09-30
1996-06-18
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific voltage responsive fault sensor
361 56, 361111, H02H 320
Patent
active
055284477
ABSTRACT:
In an electronic IC package, an I/O PAD circuit design which protects 3 Volt optimized I/O functional circuits from damage due to the application of external 5 Volt signals to the I/O PAD both while the functional circuit design is powered on and powered off. When the I/O circuits associated with the I/O PAD are powered on, the present invention protects the I/O circuits by applying well known designs. However, when the I/O circuits associated with the I/O PAD are powered off, the present invention draws power from the external 5 Volt signal to activate additional transistors to protect the powered off I/O circuits.
REFERENCES:
patent: 4922371 (1990-05-01), Gray et al.
Bullinger Philip W.
Haag Gerald R.
McManus Michael J.
Nguyen Hoang P.
Teene Andres R.
AT&T Global Information Solutions Company
Bailey Wayne P.
Fishman Daniel N.
Hyundai Electronics America
Pellinen A. D.
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