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enter image description hereI've been connected pins input A and C into VCC so the logical number is 1 and input B and input D with 0. The counter starts with 5, but it doesn't clock or change from number 5 into 0 (5,4,3,2,1,0,5,4,3,2,1,0) as I need.

What should I do for this 74190 so it will count down from 5 into 0 and so on?

Evangelina Tessia P
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  • It is way easier for users to help you, if you add a schematic to s show us, what you have done so far. Please use the integrated schematic tool to do so, it is very easy to use! – Ariser May 04 '18 at 08:01
  • thanks for your advice. Now I've been added screenshot from my circuit :)) – Evangelina Tessia P May 04 '18 at 08:32

1 Answers1

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You have to load the number and then stop loading and start counting down. Thus check the sequence of the load(not), CTEN(not) and clock pins.

  • First load low

  • Then load high

  • Then CTEN low

  • Then clocks

    Also make sure D/U is high.

By the way, all that is in the datasheet: enter image description here

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Oldfart
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