Multiple-mode CMOS I/O cell

Details Multiple-mode CMOS I/O cell Multiple-mode CMOS I/O cell

2006-06-13

2006-06-13

Wu, Xiao (Department: 2674)

Computer graphics processing and selective visual display system

Display driving control circuitry

C345S080000, C345S098000

Reexamination Certificate

active

07061478

ABSTRACT:
A CMOS output cell with multiple output modes is disclosed. In one embodiment, the cell drives a differential output signal on two output pads in one mode and two single-ended output signals on the two output pads in another mode. Differential and single-ended driver transistors are included for this purpose. A logic circuit disables unused driver transistors, and supplies appropriate drive signals to those transistors for each mode. When disabled, the driver transistors serve an electrostatic discharge (ESD) protection function, at least partially alleviating the need for ESD-specific devices in the cell. The diminished need for ESD-specific devices allows the cell to offer a highly flexible chip interface, with little or no increase in circuit area over a conventional cell that offers only single-ended or differential output.

REFERENCES:
patent: 4074256 (1978-02-01), Sekiya et al.
patent: 6181313 (2001-01-01), Yokota et al.
patent: 6229508 (2001-05-01), Kane
patent: 6310599 (2001-10-01), Bril et al.
patent: 6507350 (2003-01-01), Wilson

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