Input/output circuit and integrated circuit apparatus...

Details Input/output circuit and integrated circuit apparatus... Input/output circuit and integrated circuit apparatus...

2011-08-23

2011-08-23

Tran, Anh Q (Department: 2819)

Electronic digital logic circuitry

Interface

Supply voltage level shifting

C326S068000, C326S080000

Reexamination Certificate

active

08004311

ABSTRACT:
An input/output circuit includes an I/O node connected to a pull up and pull down circuit having a pull up and pull down transistors. Data is sent and received at through the I/O node. A level shifter provides voltages including a supply voltage and a high voltage higher than the supply voltage. A signal control circuit controls the voltage level applied to the pull up and pull down circuit. During a data input mode, data is received at the I/O node and the pull up transistor is biased at the high voltage to cut off the pull up transistor. During a data output mode, data is output at the I/O node and the pull down transistor pulls down the I/O node to ground when the output data is low, and the pull up transistor is activated when the output data is high.

REFERENCES:
patent: 5144165 (1992-09-01), Dhong et al.
patent: 5880602 (1999-03-01), Kaminaga et al.
patent: 5917339 (1999-06-01), Kim
patent: 6084431 (2000-07-01), Shigehara et al.
patent: 6838908 (2005-01-01), Ker et al.
patent: 2008/0157818 (2008-07-01), Ker et al.
patent: 100223744 (1999-07-01), None

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