Data output circuit with reduced output noise

Details Data output circuit with reduced output noise Data output circuit with reduced output noise

1995-11-15

1997-12-23

Westin, Edward P.

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Signal level or switching threshold stabilization

326 83, 326 87, 326 27, H03K 190948

Patent

active

057010900

ABSTRACT:
A data output drive transistor is rendered conductive when the potential of an internal node attains an H level, whereby an output node is discharged to the level of ground potential. When the drive transistor is turned on, the output node is discharged to the level of ground potential at high speed. This drive transistor is turned on for a predetermined time period when output of a high level data is completed, whereby the output node is discharged to the level of the ground potential for a predetermined time period. As a result, the potential of the output node is lowered from a high level to an intermediate level, so that the amplitude of a subsequent output signal is reduced. An output circuit that can effectively prevent generation of ringing with no increase in the access time is provided. A countermeasure is provided to suppress a ringing at output node which drives the output node at high speed when the output node potential attains a potential at which no ringing is caused. A stable output signal is provided at high speed.

REFERENCES:
patent: 4877978 (1989-10-01), Platt
patent: 4894561 (1990-01-01), Nogami
patent: 5017807 (1991-05-01), Kriz et al.
patent: 5153450 (1992-10-01), Ruetz

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