Open drain type output buffer

Details Open drain type output buffer Open drain type output buffer

2007-05-22

2007-05-22

Tran, Anh Q. (Department: 2819)

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Output switching noise reduction

C326S027000, C326S087000

Reexamination Certificate

active

10938534

ABSTRACT:
The open-drain type output buffer includes a first driver and at least one of (1) at least one secondary driver and (2) at least one tertiary driver. The first driver selectively pulls an output node towards a low voltage based on input data. The secondary and tertiary drivers have first and second states. Each secondary and tertiary driver pulls the output node towards the low voltage when in the first state, and does not pull the output node towards the low voltage in the second state. A control circuit, when a secondary driver is included, controls the secondary driver such that the secondary driver is in the first state when it has been determined that at least two consecutive high voltage output data have been generated. The control circuit, when a tertiary driver is included, controls the tertiary driver such that the tertiary driver is in the second state when it has been determined that at least two consecutive low voltage output data have been generated.

REFERENCES:
patent: 6073245 (2000-06-01), Hirata et al.
patent: 6710617 (2004-03-01), Humphrey
patent: 2003/0212843 (2003-11-01), Molgaard et al.
Chinese Office Action dated Jun. 9, 2006, with English translation.

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