Advanced output buffer with reduced voltage swing at output term

Details Advanced output buffer with reduced voltage swing at output term Advanced output buffer with reduced voltage swing at output term

1993-11-22

1994-11-29

Callahan, Timothy P.

Electronic digital logic circuitry

Interface

Current driving

327108, 327379, H03K 1704

Patent

active

053693167

ABSTRACT:
An advanced output buffer circuit is described which has a reduced voltage swing, in order to increase the buffer speed and to reduce electrical noise due to lower instant current flow. The reduced voltage swing is at the buffer circuit output terminal, acting in response to control signals and a data signal on its input terminals. A first inverter stage has as its input the input terminal at which is applied the data signal, and delays the data signal. A second inverter stage with its input being the input terminal at which is applied the data signal, provides an inverted data signal at its output. A blocking circuit, responsive to the control signals, blocks the data signal and the inverted data signal. A biasing circuit, also responsive to the control signals, biases a first and second output node to a first intermediate voltage level, the first and second output nodes being connected to outputs of the blocking circuit. There is also a generating circuit, with its inputs connected to the first and second output nodes, for generating a second intermediate voltage level at the output terminal in response to the first intermediate voltage level during the blocking of the data signal, wherein the generating circuit provides the data signal at the circuit output when the blocking circuit allows the data signal to pass through.

REFERENCES:
patent: 4926383 (1990-05-01), Kertis et al.
patent: 4975877 (1990-12-01), Bell
patent: 4983860 (1991-01-01), Yim et al.
patent: 4984208 (1991-01-01), Sawada et al.
patent: 4988888 (1991-01-01), Hirose et al.
patent: 5057711 (1991-10-01), Lee et al.
patent: 5091889 (1992-02-01), Hamano et al.
patent: 5151621 (1992-09-01), Goto
patent: 5311076 (1994-05-01), Park et al.

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