Circuit arrangement for an input keyboard

Details Circuit arrangement for an input keyboard Circuit arrangement for an input keyboard

1979-12-10

1981-05-05

Waring, Alvin H.

Communications: electrical

Digital comparator systems

340365R, H04Q 352

Patent

active

042662133

ABSTRACT:
The invention provides an electronic circuit, preferably in CMOS, for a keyboard switch matrix with only two pole switches and no interconnecting diodes. The column and row wires are each connected to ground via a resistor and to the supply voltage via an electronic switch and an inverter. The output of the row inverters are connected to a NAND gate which controls the electronic switches.

REFERENCES:
patent: 3708626 (1973-01-01), Lutz
patent: 3940571 (1976-02-01), Ashley
patent: 4060699 (1977-11-01), Ataka et al.

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