making down counter become one shot counter

[zahiy]

Hello,

is there any way I can configure CD40103BE (presettable down counter) to stop after Carry Out? like one shot counter. After a trigger it needs to count the Jam, when it gets to 0 it gives me Carry Out signal and STOPS! I dont want it to count again.


any help?

thank you.

 

[andre_luis]

Although not properly recommended due to don´t employ a synchronous approach, you could try firstly connecting a XOR 2-port gate.




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[zahiy]

Although not properly recommended due to don´t employ a synchronous approach, you could try firstly connecting a XOR 2-port gate.




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thank you for your help, can you be more specific, where to connect the XOR gate?

 

[FvM]

Feed back inverted CARRY OUT# to CI/CE#.

 

[andre_luis]

Try this way:

• Connect 1st gate input to external measured signal
• Connect 2nd gate input to counter output
• Connect gate output to counter input

Correction: Not a XOR gate, but a NOR.

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[zahiy]

Thank you, i will try it tomorrow and post the result

 

[andre_luis]

Solution purposed at post #4 by FvM is quite better, due do not require external gates.


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