Low power digit blanking circuit

Details Low power digit blanking circuit Low power digit blanking circuit

1974-11-26

1976-06-08

Smith, Jerry

Registers

Transfer mechanism

Traveling pawl

3401725, 340324R, G06F 314

Patent

active

039625710

ABSTRACT:
A greatly simplified calculator circuit implemented, for example, utilizing I.sup.2 L technology is fabricated on a relatively small semiconductor chip resulting in high yield. The segment and digit drivers which are fabricated on the same semiconductor chip utilizing I.sup.2 L techniques have grounded emitters requiring a relatively large power drain to produce blank segments. A unique feature of the calculator is an automatic blanking circuit which turns off both the segment and digit drivers for blank digits to provide no power drain while selectively enabling the digit drivers and segment drivers so that the keyboard can be scanned utilizing the same digit drivers.

REFERENCES:
patent: 3460097 (1969-08-01), Kubo et al.
patent: 3749896 (1973-07-01), Munt
patent: 3755806 (1973-08-01), Bunting
patent: 3812489 (1974-05-01), Hirano et al.
patent: 3815098 (1974-06-01), Kimura et al.
patent: 3820107 (1974-06-01), Niizawa et al.

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