Electronic EC for minimizing EC pads

Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock

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307 42, 307242, 371 15, 361395, H03K 326, H03K 3335

Patent

active

047468157

ABSTRACT:
A specially designed module and integrated circuit chip therefor which permits the sharing of module EC pads between chip receiver and driver circuits. The chip has a direct normal input line to each receiver circuit therein and a direct normal output line from each driver circuit therein along with signal lines from each of those circuits to various EC pads. The chip further includes a switching and control circuit for switching the receiver circuits and driver circuits between their normal and EC lines to effect an electronic delete function. In a preferred embodiment, a majority of the EC pads are switchably connected via the switching and control circuit to different sets of three adjacent receiver circuits, driver circuits, or a combination thereof. The design permits the use of approximately half the EC pads normally required for a module, while permitting EC connections to be made in most cases to three adjacent receiver or driver circuits simultaneously.

REFERENCES:
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patent: 3815025 (1974-06-01), Jordan
patent: 4357703 (1982-11-01), Van Brunt
patent: 4417203 (1983-11-01), Pfeiffer et al.
patent: 4445048 (1984-04-01), Grahan
patent: 4485472 (1984-11-01), Sproull
patent: 4489364 (1984-12-01), Chance et al.
patent: 4526859 (1985-07-01), Christensen et al.
patent: 4549200 (1985-10-01), Ecker et al.
patent: 4659942 (1987-04-01), Volp

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