Integrated circuit device having a circuit means for detecting a

Details Integrated circuit device having a circuit means for detecting a Integrated circuit device having a circuit means for detecting a

1983-02-07

1986-09-16

Miller, Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307350, 328120, 340652, H03K 326, H03K 5153, H03K 519

Patent

active

046124535

ABSTRACT:
A circuit for detecting a disconnected input signal line to an integrated circuit includes an emitter follower stage having a transistor whose base is connected to the monitored input signal line, the input signal being transferred to the integrated circuit through the base-emitter path of the emitter follower. A current source transistor connects to the emitter of the emitter follower transistor, the base of the current source transistor being coupled to a voltage supply and a detector circuit, the detector circuit functioning to detect the base-emitter voltage of the current source transistor. The detected voltage provides an indication of whether or not the input signal line is connected to the base of the emitter follower transistor.

REFERENCES:
patent: 3582665 (1971-06-01), Prozeller
patent: 4115711 (1978-09-01), Moussie
patent: 4236146 (1980-11-01), Clark et al.
patent: 4322634 (1982-03-01), Kaire et al.
patent: 4385243 (1983-05-01), Suzuki

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