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LARGE_LED_DISPLAY

2016-12-20 11:39  
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LARGE_LED_DISPLAY
National MM5736 calculator chip is used with DM8895 segment driver that can be mask-programmed to source several values of current in range from 5 to 17 mA per segment of LED display, permitting use of fairly large display. Display current comes from VCC supply terminal of DM8895 rather than from calculator chip. Combination serves as 6-decade counter driving 6-digit display. -M. Watts, Calculator Chip Makes a Counter, Na-tional Semiconductor, Santa Clara, CA, 1974, AN-112, p 3.