Circuit for forcing known voltage on unconnected pads of an inte

Details Circuit for forcing known voltage on unconnected pads of an inte Circuit for forcing known voltage on unconnected pads of an inte

1992-10-23

1994-07-12

Westin, Edward P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

3074821, 307520, 307550, H03K 1716, H03K 326

Patent

active

053291743

ABSTRACT:
A feedback circuit for input pads of an integrated circuit where one or more of the input pads may not be bonded to a package pin when the pad is packaged or alternatively is bonded but the pin is not externally connected. The feedback circuit includes a transistor connected between the input pad and the output of the first associated input buffer so that whenever the integrated circuit is at a steady state, i.e. is off or has been powered on, no direct current is drawn by the pad because the unbonded pad is forced to be either in the high or low state by the feedback transistor. The feedback transistor may be a pull down device or a pull up device or a full inverting gate; in any case the feedback device draws no direct current when the input pad connected thereto is at its fully high or fully low state voltage.

REFERENCES:
patent: 4577124 (1986-03-01), Koike
patent: 4700086 (1987-10-01), Ling et al.
patent: 4843262 (1989-06-01), Abe
patent: 4990800 (1991-02-01), Lee
patent: 5036227 (1991-07-01), Jo et al.
patent: 5065048 (1991-11-01), Asai et al.
patent: 5151622 (1992-09-01), Thrower et al.
patent: 5166561 (1992-11-01), Okura

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