Input and output circuit of an integrated circuit and a method for testing the same
AssigneeInfineon Technologies AG
InventorsRalf Arnold, Martin Glas, Christian Mueller, Hans-Dieter Oberle
Life of this patent
Estimating the term…
Abstract
An integrated circuit includes at least one input and output circuit including: a signal terminal that provides an external contact; a protective circuit coupled to the signal terminal; an input driver and/or an output driver coupled to the signal terminal via the protective circuit; and an additional circuit including a first input coupled to the signal terminal via the protective circuit, and an output that provides a test value for operation of the input and output circuit.
Claims13
An integrated circuit, comprising:
- at least one input and output circuit, comprising:
- a signal terminal that provides an external contact;
- a protective circuit coupled to the signal terminal;
- an input driver and/or an output driver coupled to the signal terminal via the protective circuit;
- an additional circuit including a first input coupled to the signal terminal via the protective circuit, and an output that provides a test value for operation of the input and output circuit;
- a pull-up transistor connected to a first voltage supply line;
- a pull-down transistor connected to a second voltage supply line;
- a first switch for switching the pull-up transistor between the first voltage supply line and a first reference voltage line;
- and
- a second switch for switching the pull-down transistor between the second voltage supply line and a second reference voltage line.
An integrated circuit, comprising:
- at least one input and output circuit, comprising:
- a signal terminal that provides an external contact;
- a protective circuit coupled to the signal terminal, the protective circuit comprising at least one protective transistor;
- an input driver and/or an output driver coupled to the signal terminal via the protective circuit;
- and
- an additional circuit including:
- a first input coupled to the signal terminal via the protective circuit;
- and
- an output that provides a test value for operation of the input and output circuit;
- and
- a logic unit that controls the at least one protective transistor.
An integrated circuit, comprising:
- at least one input and output circuit, comprising:
- a signal terminal that provides an external contact;
- a protective circuit coupled to the signal terminal;
- an input driver and/or an output driver coupled to the signal terminal via the protective circuit;
- and
- an additional circuit including:
- a first input coupled to the signal terminal via the protective circuit;
- an output that provides a test value for operation of the input and output circuit;
- and
- an analog comparator including a test signal input for applying the signal present at the signal terminal, and a reference input for applying a reference signal.
An integrated circuit, comprising:
- at least one input and output circuit, comprising:
- a signal terminal that provides an external contact;
- a protective circuit coupled to the signal terminal;
- an input driver and/or an output driver coupled to the signal terminal via the protective circuit;
- and
- an additional circuit including;
- a first input coupled to the signal terminal via the protective circuit;
- an output that provides a test value for operation of the input and output circuit;
- first and second inverters being connected to the signal terminal via the protective circuit;
- and
- a logic unit that combines output signals of the first and second inverters to form a common output signal.
Dependencies are inferred from the claim text.