Logic circuit

Details Logic circuit Logic circuit

1985-02-22

1987-06-02

Popek, Joseph A.

Static information storage and retrieval

Read only systems

Semiconductive

365227, G11C 1700

Patent

active

046708596

ABSTRACT:
A logic circuit of a large scale which consumes small amounts of electric power is comprised of a plurality of ROM portions each formed of IIL circuits. Input signal lines are commonly used to transmit input signals to the ROM portions. The plurality of ROM portions are selectively operated by ROM select signals, and outputs corresponding to the input signals are obtained from a selected ROM portion. To select a particular ROM portion out of the plurality of ROM portions, the emitters of inverse npn transistors of IIL circuits constituting the selected ROM portion are rendered to assume ground potential. In the meantime, the emitters of the inverse npn transistors of IIL circuits in the non-selected ROM portions are held in a floating condition. This makes it possible to obtain a logic circuit which consumes small amounts of electric power with a very simple construction since the non-selected ROM portions consume no power.

REFERENCES:
patent: 4374431 (1983-02-01), Ono et al.
patent: 4532612 (1985-07-01), Tanaka et al.

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