Voltage mismatch tolerant input/output buffer

Details Voltage mismatch tolerant input/output buffer Voltage mismatch tolerant input/output buffer

2005-04-12

2005-04-12

Wells, Kenneth B. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

C327S333000, C326S083000

Reexamination Certificate

active

06879191

ABSTRACT:
Embodiments of the invention include a data buffer for connecting a core of a data circuit to a data pad. External devices may couple to the data pad even if they have a different power supply voltage than does the core of the data circuit. A pass transistor is coupled between the data pad and a data node in the buffer. A control circuit monitors a signal on the data pad and drives the pass transistor according to the signal received, thereby preventing damage due to voltage mismatch between the data circuit and the external device.

REFERENCES:
patent: 5537060 (1996-07-01), Baek
patent: 5760634 (1998-06-01), Fu
patent: 6031393 (2000-02-01), Wayner
patent: 6130556 (2000-10-01), Schmitt et al.
patent: 6163179 (2000-12-01), Huang et al.
patent: 6188243 (2001-02-01), Liu et al.

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