Patent ID: 8400190

Claim:
An integrated circuit device comprising: a pad adapted to receive a signal from an internal or external driver; an input buffer circuit having an input terminal coupled to the pad, and having an output terminal providing an input signal to internal circuitry of the integrated circuit, the input buffer circuit comprising: a pass transistor providing a weak current path from a first fixed reference voltage to the pad, having a control terminal, having a first conduction terminal and having a second conduction terminal, the first conduction terminal electrically coupled to the pad, and the second conduction terminal electrically coupled to the first fixed reference voltage; a latch having a terminal electrically coupled to the control terminal of the pass transistor, the latch having a first state in which the pass transistor is turned on coupling the first fixed reference voltage to the pad, and a second state in which the pass transistor is turned off decoupling the first fixed reference voltage from the pad; and circuitry coupled to the latch, said circuitry including a feedback circuit including a transistor having a control terminal electrically coupled to the pad, a first conduction terminal electrically coupled to a second fixed reference voltage, and a second conduction terminal coupled to the latch, to cause the latch to transition to the second state in response to a change in voltage on the pad.