Fail soft tri-state logic circuit

Details Fail soft tri-state logic circuit Fail soft tri-state logic circuit

1981-03-31

1984-01-10

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307442, H03K 19007, H03K 19003, H03K 19092, H03K 19094

Patent

active

044255179

ABSTRACT:
A tri-state logic circuit which, upon failure of its operating potential, produces a high impedance between its output terminals. The tri-state logic circuit includes first and second complementary conductivity type transistors each with a control electrode and with a conduction path. The paths are connected in series to the operating potential. The control electrode of the first transistor is connected to an intermediate point in a series switching circuit the ends of which are connected to the operating potential. The series circuit is responsive to the presence of the operating potential and to binary data and control signal inputs of given values for causing the conduction path of the first transistor to assume a low impedance state. The series circuit also includes on both sides of said intermediate point devices responsive to a loss in the operating potential for causing the first transistor to assume a high impedance state irrespective of the value of the data and control signals.

REFERENCES:
patent: 4280065 (1981-07-01), Minato et al.
patent: 4329600 (1982-05-01), Stewart
patent: 4363978 (1982-12-01), Heimbigner
Drawing No. 978964, Sheet 28, by Raytheon Company.

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