Data output buffer

Details Data output buffer Data output buffer

1995-07-13

1997-01-14

Wambach, Margaret Rose

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327170, H03K 512

Patent

active

055943748

ABSTRACT:
A data output buffer comprising a pull-up driver connected between a first voltage source and a data output line, for amplifying a first logic value of an input data signal, a pull-down driver connected between a second voltage source and the data output line, for amplifying a second logic value of the input data signal, a pull-down driver connection circuit connected between the pull-down driver and the second voltage source, for varying an impedance of the pull-down driver, and a pull-down driver control circuit for detecting whether the input data signal has its second logic value and generating a control signal in accordance with the detected result to control the operation of the pull-down driver connection circuit. According to the present invention, the data output buffer can control an amount of current flowing through the pull-down driver in a multi-step manner to minimize an impulse noise component in low logic output data on the data output line.

REFERENCES:
patent: 4634894 (1987-01-01), Shu et al.
patent: 5148048 (1992-09-01), Kawasaki et al.
patent: 5191245 (1993-03-01), Kang

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