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need some help on resetting the 74LS90N ic in a digital clock circuit....

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tanggang

New Member
i did a digital clock circuit and need some help in resetting the 74LS90 IC.i know that the 74LS90 can be reset when a HIGH input is connected to pin2 and pin3..but in my clock circuit..i had to connect a AND gate to the pin2 and pin3 as i want the second IC in the following picture to only count from 0 until 5 (the tenth part to count the seconds)...hope someone could help me here...i need help to reset the second IC in the following pic which counts from 0till 5....
 

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Goldwolf99

New Member
The AND gate is not needed. You just need to set the second IC as to mod 6. To do that connect pin 2 to pin 9 and pin 3 to pin 8 and it will count 0 to 5 and reset to zero. As for resetting the IC, you should be able to input the high to pins 2 and 3 even when connected to other pins or gates.
 

MikeMl

Well-Known Member
Most Helpful Member
The AND gate is not needed....

Welcome Goldwolf. Nice suggestion. However, the original posting was back in 2009. Chances the OP has moved on....
 
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