Programmable CMOS circuit for use in connecting and disconnectin

Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons

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307441, 307446, 307451, 307466, 307469, 307570, 307585, 307252A, 357 38, 357 43, H03K 1712

Patent

active

046058729

ABSTRACT:
A programmable circuit is described which is particularly well suited for programming or customizing redundant elements in CMOS integrated circuits. This programmable circuit, which is formed on a semiconductor substrate together with a redundant semiconductor device, uses a parasitic switching device on the semiconductor substrate to deselect the redundant semiconductor device in response to a programming signal. The programmable circuit includes an input terminal to receive the programming signal, a parasitic SCR formed on the semiconductor substrate and coupled to the input terminal and a deselect device such as a fuse or antifuse to deselect the redundant semiconductor device. The parasitic SCR is actuated in response to the programming signal and the deselect device is connected to the SCR and the semiconductor device to deselect the semiconductor device from the redundant electrical circuit in response to the actuation of the SCR by the programming signal.

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