Switch circuit provided with means for setting up the initial co

Details Switch circuit provided with means for setting up the initial co Switch circuit provided with means for setting up the initial co

1983-09-30

1986-12-30

Moffitt, James W.

Static information storage and retrieval

Powering

Data preservation

G11C 1140

Patent

active

046334440

ABSTRACT:
In a switch circuit, there are provided a signal input stage comprising an array of switches paired with pilot lamps; a storage circuit comprising I.sup.2 L elements for storing a signal derived from the signal input stage; a circuit for causing that one of the pilot lamps be lit which is associated with a predetermined one of the switches; electronic switches for controlling a signal source in response to the signal derived from the signal input stage; an auxiliary current source circuit for holding the memory at the storage circuit when the main power supply is interrupted; and a circuit adapted, when the capacity of the auxiliary current source circuit is decreased and when the main power is supplied, to turn on a predetermined one of the switches while turning off the remaining ones of the switches, thereby setting the storage circuit to a predetermined initial condition.

REFERENCES:
patent: 4218764 (1980-08-01), Furuta et al.

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