04961010 is referenced by 128 patents and cites 4 patents.

An output buffer for reducing switching induced noise in high speed integrated circuit devices incorporates a relatively small current carrying capacity secondary pulldown transistor element with the current path first and second terminal leads coupled in parallel with the current path first and second terminal leads of the primary pulldown transistor element. A separate pulldown delay resistance element of selected value is coupled in series between the control terminal leads of the secondary and primary pulldown transistor elements. The secondary pulldown transistor element control terminal lead is coupled in the output buffer to receive a signal propagating through the output buffer before the primary pulldown transistor element control terminal lead. A relatively small discharge current is therefore limited from the output before turn on of the relatively large discharge current of the primary pulldown transistor element. The separate pulldown delay resistance element delays turn on of the primary pulldown transistor element a specified time delay after turn on of the secondary pulldown transistor element during transition from high to low potential at the output. As result ground bounce is divided into two spikes and the ground rise in potential is constrained to approximately one-half that of conventional ground bounce levels. A secondary pullup transistor element with associated noise reduction components can similarly be used on the supply side to reduce V.sub.cc droop.

Title
Output buffer for reducing switching induced noise
Application Number
7/355509
Publication Number
4961010
Application Date
May 19, 1989
Publication Date
October 2, 1990
Inventor
Jeffrey B Davis
Raymond
ME, US
Agent
Daniel H Kane
Lee Patch
Assignee
National Semiconductor Corporation
CA, US
IPC
H03K 5/12
H03K 19/094
H03K 17/16
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