Friday, August 28, 2009 I'm confused

I replaced the 74HC163 which was behaving strangely with a 74LS163. I also changed my "logic probe" circuit to use a 74HCT04 instead of a 74HC04 for the inputs, in order to cope with the LS-TTL output levels.

Well, strangely enough, the modified circuit also jumps from a count of 1111 to a count of 0001. Obviously, there is something I don't understand about the '163.


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