Electronic digital logic circuitry – Signal sensitivity or transmission integrity – Output switching noise reduction
Patent
1997-04-22
1999-06-29
Tokar, Michael
Electronic digital logic circuitry
Signal sensitivity or transmission integrity
Output switching noise reduction
326 83, 326 86, 326 30, H03K 1716, H03K 19003
Patent
active
059173351
ABSTRACT:
The present invention concerns an output buffer, which overcomes previous disadvantages of driving transmission line loads by providing a variable output impedance in response to the load on the output. The buffer generally comprises a pullup device for providing a high voltage at the output in response to a first input, a pulldown device configured to provide a low voltage at the output in response to a second input and a second pulldown device configured to provide additional low drive at the output. The second pulldown device provides an impedance at the output which varies with respect to the voltage present at the output.
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Chang Daniel D.
Cypress Semiconductor Corp.
Maiorana Christopher P.
Tokar Michael
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