Method and device for improving I/O ESD tolerance

Details Method and device for improving I/O ESD tolerance Method and device for improving I/O ESD tolerance

1995-03-06

1996-04-30

Deboer, Todd

Electricity: electrical systems and devices

Igniting systems

For explosive devices

361111, H02H 906

Patent

active

055130640

ABSTRACT:
An input protection device is presented for improving I/O electrostatic discharge ESD tolerance. The present invention protects a selected device by providing a sufficient potential difference between the substrate and the source of the device in question to protect it against an electrostatic discharge. In one embodiment of the invention, a resistor is placed between the substrate and the internal V.sub.SS connection. All V.sub.SS to substrate contacts have to be removed for internal V.sub.SS busses to be maintained at a predetermined resistance between the substrate and V.sub.SS. In other embodiments of the invention, an active device is placed between the substrate and the internal V.sub.SS connection. As with the first described embodiment, all V.sub.SS to substrate contacts have to be removed for internal V.sub.SS busses to be maintained at a predetermined resistance between the substrate and V.sub.SS. The active device presents a high impedance when not powered on and is very conductive when powered on.

REFERENCES:
patent: 3947727 (1976-03-01), Stewart
patent: 4868705 (1989-09-01), Shiochi et al.
patent: 4930037 (1990-05-01), Woo

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