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Nov 1 at 5:50 comment added user71659 That's a classic textbook example of optimizing with don't cares.
Nov 1 at 1:08 history edited Spehro 'speff' Pefhany CC BY-SA 4.0
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Oct 31 at 16:42 history edited Spehro 'speff' Pefhany CC BY-SA 4.0
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Oct 31 at 16:24 history edited Spehro 'speff' Pefhany CC BY-SA 4.0
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Oct 31 at 16:22 comment added Spehro 'speff' Pefhany @PeterBennett Indeed they are (not all datasheets show the display though). Added the relevant section to the answer. (Somewhat) later designs such as the 4511 blank on invalid inputs. And the MC14495 and, if memory serves, some others decode hex so they could be used for either BCD or hex.
Oct 31 at 16:19 history edited Spehro 'speff' Pefhany CC BY-SA 4.0
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Oct 31 at 16:04 comment added Peter Bennett I believe that the "oddball outputs" for 0xA - 0xF inputs will be shown on the 7447 and 7448 datasheets.
Oct 31 at 14:37 history edited Spehro 'speff' Pefhany CC BY-SA 4.0
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Oct 31 at 14:31 history answered Spehro 'speff' Pefhany CC BY-SA 4.0