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US 5,329,174 AGranted
Circuit for forcing known voltage on unconnected pads of an integrated circuit
AssigneeXilinx, Inc.
InventorDavid Chiang
Life of this patent
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AssigneeXilinx, Inc.
InventorDavid Chiang
Estimating the term…
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.
A circuit for forcing a terminal of an integrated circuit to a known voltage, comprising:
A method of forcing a pad not connected to an external signal source of an integrated circuit die to a known voltage, comprising the steps of:
A circuit for forcing a terminal of an integrated circuit to a known voltage comprising:
A circuit for forcing a terminal of an integrated circuit to a known voltage comprising:
Dependencies are inferred from the claim text.