Data-outputting buffer circuit

Details Data-outputting buffer circuit Data-outputting buffer circuit

1997-10-17

1999-05-11

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

326 86, 327108, 327389, 327427, H03K5/08

Patent

active

059031794

ABSTRACT:
Data-outputting buffer circuit suitable for reducing noise which is generated in an output buffer circuit part when minus electric filed is applied to a data output pad in inputting data is disclosed, including a noise generation restraining part detecting a level of a signal applied to an input/output pad inputting and outputting data for outputting first and second noise generation restraining signals, a pullup transistor having a source connected to the input/output pad and a drain electrode connected to a power voltage terminal, a pulldown transistor serially connected to the pullup transistor with both sources of the pullup and pulldown transistors connected to the input/output pad, first and second driving parts for driving the pullup transistor and the pulldown transistor, and a clamp transistor turned on by the first noise generation restraining signal for restraining increase of substrate bias due to voltage difference between a gate and the source of the pullup transistor.

REFERENCES:
patent: 4678950 (1987-07-01), Mitake

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