CALCULATOR_AS_COUNTER

Published:2009/7/13 4:21:00 Author:May | From:SeekIC

National MM5736 calculator chip is used with two DM75491 segment drivers and DM75492 digit driver for LED 6-digit display. Switches provide manual control of counter. To reset, push S1 to clear calculator, push S2 to enter a 1, then push S3 when new count is to be started. Current drive to LEDs is supplied by Vcc through cur rent-limiting resistors, giving power saving be-cause Vcc can be less than Vss. Will drive large LED display. -M. Watts, Calculator Chip Makes a Counter, National Semiconductor, Santa Clara, CA, 1974, AN-112, p 4.



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