MULTIPLEXING_7_DIGITS

Published:2009/7/1 22:10:00 Author:May | From:SeekIC

Uses Motorola MC3490 anode driver for active-high inputs (MC3494 for active-Iow inputs) to accept digitselect signals from multiplex logic source and drive display anodes directly. Constant cathode currents are maintained for gas-discharge display by Bionics Dl-300 IC, to provide constant brightness without using supply-voltage reguIation. For each digit added to display, equal number of anode drivers is required. Only one cathode driver is needed because all cathodes are bused together.-D. Sien, Multiplex Display Circuit Features Minimum Parts Count, EDN Magazine, May 5,1977, p 112.



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