12_DIGIT_GAS_DISCHARGE

Published:2009/7/1 20:21:00 Author:May | From:SeekIC

Display anodes are referenced to ground and cathodes to -180 V because number of digits in display is greater than number of segment drivers. Positive-logic CMOS address circuits are powered by -10 V, with Motorola MC14558 decoder outputs coupled to MC3491 segment drivers. Scan circuit is directly coupled to MC3490P anode drivers. Digit scanning is derived from two cascaded MC14022 octal counter/dividers. Required 12 sequenced output pulses are achieved by resetting counters with Q7 output of second counter. Counter output also controls system multiplexer (not shown) to give synchronization of entire display system.-A. Pshaenich, Interface Considerations for Numeric Display Systems, Motorola, Phoenix, AZ, 1975, AN-741, p 23.



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