Integrated bus hold and pull-up resistor

Details Integrated bus hold and pull-up resistor Integrated bus hold and pull-up resistor

2006-12-26

2006-12-26

Tran, Anh Q. (Department: 2819)

Electronic digital logic circuitry

Multifunctional or programmable

C326S041000, C326S082000, C326S056000

Reexamination Certificate

active

07154296

ABSTRACT:
Circuits, methods, and apparatus that combine a bus hold and a pull-up circuit in a die area efficient and conflict free manner. An exemplary embodiment of the present invention combines a bus hold resistor with a pull-up resistor. The resistor is connected between a pad and an inverter. When a user selects a bus hold function for the pad, the inverter is enabled and driven through a second inverting gate by the pad. When a pull-up function is selected, the inverter output is driven high. If neither function is selected, the inverter output is tri-stated. In this way, the die area of a second resistor is saved and potential conflicts between these alternately available functions are avoided.

REFERENCES:
patent: 6172519 (2001-01-01), Chiang et al.
patent: 6191607 (2001-02-01), Meng et al.
patent: 6624656 (2003-09-01), Fox et al.
patent: 6731137 (2004-05-01), Rangan et al.

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