Five volt output connection for a chip manufactured in a three v

Details Five volt output connection for a chip manufactured in a three v Five volt output connection for a chip manufactured in a three v

1996-12-20

1999-07-20

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327434, 326 80, 326 81, 326 63, H03L 500

Patent

active

059260556

ABSTRACT:
An output circuit for producing 5 volt output signals from a chip that is manufactured in a 3 volt process, is provided with a control signal logic circuit, a pseudoground generating circuit, and an output signal generation circuit. The control signal logic circuit receives 3 volt data signals from the internal logic circuitry of the chip, and produces control signals as a function of these 3 volt data signals. The pseudoground generating circuit is coupled to the control signal logic circuit and generates a pseudoground greater than zero volts and intermediate output signals as a function of the control signals produced by the control signal logic circuit. The output signal generation circuit is coupled to the pseudoground generating circuit and generates the 5 volt output signals as a function of the intermediate output signals generated by the pseudoground generating circuit. As a result of the creation of the pseudoground, the voltage differential to which the semiconductor devices in the output circuit are subjected is always less than 5 volts. This prevents the rapid degradation of the oxide layer in the semiconductor devices of the output circuit, allowing the 3 volt process chip to interface with 5 volt process devices without premature failure of the chip.

REFERENCES:
patent: 5146118 (1992-09-01), Nakamura et al.
patent: 5378943 (1995-01-01), Dennard
patent: 5559464 (1996-09-01), Orii et al.
patent: 5680068 (1997-10-01), Ochi et al.

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