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May 12, 2013 at 16:55 comment added Peter Bennett With bipolar (real) TTL logic inputs, it is best to connect switches between the input pin and ground, as the inputs source current, and, if a resistor is used to pull the input low, a fairly low value resistor is required to ensure that the input is seen as a low.
S Feb 18, 2013 at 20:39 history suggested Kevin Reid CC BY-SA 3.0
Recovered missing image from web.archive.org and copied to SE imgur
Feb 18, 2013 at 20:04 review Suggested edits
S Feb 18, 2013 at 20:39
Jun 18, 2012 at 7:16 history edited Ammar CC BY-SA 3.0
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Jun 18, 2012 at 6:05 history answered Ammar CC BY-SA 3.0