Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1992-08-14
1993-06-29
Westin, Edward P.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307456, 307443, H03K 1902, H03K 19088
Patent
active
052237451
ABSTRACT:
A circuit to be used with bistate and tristate output buffers as a means of diverting from the output pulldown transistor Miller Current arising while the output buffer is powered down. Its purpose is to avoid loading the common bus to which the output buffer is attached, in particular under the circumstances where other output buffers on the bus are causing transitions to occur and the buffer of interest has been powered down. In its preferred embodiment the invention utilizes a MOS transistor coupled between the output pulldown transistor and the lower potential power rail of the output buffer. This MOS transistor is controlled by another MOS transistor coupled to output V.sub.OUT of the buffers. This driver transistor is controlled by the high potential power rail of the buffer and so turns on the Miller Current Discharge Transistor only when the buffer is powered down. The invention also encompasses a discharge transistor coupled to the data input V.sub.IN to ensure that the Miller Current Discharge Transistor never pulls the of the output pulldown when the buffer is in its active low state.
REFERENCES:
patent: 4311927 (1982-01-01), Ferris
patent: 4321490 (1982-03-01), Bechdolt
patent: 4330723 (1982-05-01), Griffith
patent: 4572970 (1986-02-01), Allen et al.
patent: 4698525 (1987-10-01), Tavana et al.
patent: 5051623 (1991-09-01), Yarbrough et al.
patent: 5107141 (1992-04-01), Yano et al.
patent: 5132569 (1992-07-01), Matsuda
patent: 5153456 (1992-10-01), Keown
Clukey Stephen W.
Haacke Ernest D.
Ohannes James R.
Yarbrough Roy L.
Bohan Thomas L.
Calderwood Richard C.
National Semiconductor Corporation
Roseen Richard
Westin Edward P.
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