03-01-2010 01:21 PM
05-06-2011 11:29 AM
I am having the exact same issue. I'll look more into it.
05-06-2011 12:30 PM - edited 05-06-2011 12:31 PM
The 74247 has an open collector output, this means you need pull up resistors to interface it with the 7-Segment Display.
Add a 100 ohm pull up on each line between the chip and the 7-segment display to ensure your output from the chip is correctly transmitted to the 7-segment display.
Without the pull up the common anode display will not light up, once the pull up resistors are in place it should function as expected.