using 74190- up count

[tshadin]

mmm ... hi
i need to make an hour counter that count (59:59:23) using 74190- up count

 

[crutschow]

tshadin, please don't hijack 5 year old threads. Start a new one of your own.

 

[KeepItSimpleStupid]

@crutschow

A bit tough, even for me to undersatd.

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I think, one of the concepts that crutschow is trying to illustrate is that a Data-selector multiplexor can allow you to cheat. You can make any function you wish with three inputs with a 3 bit input mux. The "address" becomes the inputs and the "DATA" becomes the output. So, if you want a 101 to output a 1 and all the others to output a zero or 1, you can.

One gate I don't see very often is a quad 2-input XNOR gate with open collector outputs. https://www.futurlec.com/74LS/74LS266.shtml It's a great chip to use as a cascadeable comparitor (= to). An old minicomputer from the 70's used this technique a lot.

For some reason now, my post makes no sense. Something must have moved?