Circuit arrangement for multiplexing an input function and an ou

Details Circuit arrangement for multiplexing an input function and an ou Circuit arrangement for multiplexing an input function and an ou

1980-01-31

1981-10-06

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

358139, H04N 962

Patent

active

042938708

ABSTRACT:
A circuit arrangement is provided for multiplexing an input signal and an output signal through a single circuit terminal. Means are coupled to the terminal for selectively applying first input signals to the terminal of a signal level included within a first range of signal levels. Means including a first transistor having an input electrode coupled to a second signal source and an output electrode coupled to the terminal are provided for developing, in the absence of the first input signals, output signals at the terminal which occupy a second range of signal levels which is exclusive of the first range. A second transistor has an input electrode coupled to the terminal and an output electrode, and is biased to be responsive to signals at the terminal which occupy the first range of signal levels.

REFERENCES:
patent: 3959811 (1976-05-01), Shanley
patent: 4173769 (1979-11-01), van Straaten

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