Integrated circuit bus switching circuit

Details Integrated circuit bus switching circuit Integrated circuit bus switching circuit

1989-01-10

1990-07-31

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307270, 3073032, 307576, 307579, 307585, 323284, 323289, H03K 17687, H03K 326, G05F 140

Patent

active

049452673

ABSTRACT:
A circuit is provided for switching an internal bus of an integrated circuit between an input/output pad on the integrated circuit and a circuit node of the integrated circuit. A first switch is connected between the input/output pad and the internal bus. A second switch is connected between the circuit node and the internal bus. A high voltage detector senses the presence or absence of a voltage exceeding a preselected threshold on the input-output pad. The high voltage detector assumes a first state if the voltage on the input/output pad exceeds the preselected threshold, and assumes a second state if the voltage on the input/output pad does not exceed the preselected threshold. Switch control circuitry responsive to the high voltage detector activates either the first or second switch depending upon the output of the high voltage detector. Circuitry is provided to prevent the first and second switches from being active simultaneously and for lowering the capacitance of the input/output pad.

REFERENCES:
patent: 4061930 (1977-12-01), Nerem

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