Programmable I/O buffer

Details Programmable I/O buffer Programmable I/O buffer

2005-08-30

2005-08-30

Cho, James H. (Department: 2819)

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Bus or line termination

C326S027000

Reexamination Certificate

active

06937055

ABSTRACT:
A programmable input/output buffer has a first plurality of pull-down transistors connected between a supply voltage and an electrical system conductor on the integrated circuit and a second plurality of pull-down transistors connected between the electrical conductor and the system reference voltage. Reference circuits generate signals to turn on a first number of said first plurality of pull-up transistors and/or a second number of said second plurality of pull-down transistors to provide an input/output buffer impedance matching the impedance of the external transmission line either sending a signal to the programmable input/output buffer or receiving a signal from the programmable input/output buffer.

REFERENCES:
patent: 4719369 (1988-01-01), Asano et al.
patent: 5602494 (1997-02-01), Sundstrom
patent: 6366129 (2002-04-01), Douglas et al.
patent: 6642740 (2003-11-01), Kim et al.
patent: 06163630 (1994-06-01), None

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