hi i wanted to ask that the counter i want to use is cd4029B. what does it mean preset enable? does it work like Clear? cos i need a reset function for my circuit. can someone explain what does jams input, preset enable, carry in carry out means? couldn't understand what the datasheet is saying. sorry i am new to this.

 

As the datasheet says:

http://www.ti.com/lit/ds/symlink/cd4029b.pdf
http://www.ti.com/lit/ds/symlink/cd4029b.pdf
A low on each JAM line, when the PRESET-ENABLE is high resets the counter to its zero count.

JAM lines are inputs to the counter bits.
Keep PRESET-ENABLE low when you want to count.
Set PRESET-ENABLE to high when you want to jam the inputs into the counter, i.e. presetting the counter to whatever value you desire.
Bring the PRESET-ENABLE back to low.
If the JAM inputs are 0000, then the effect is the same as clearing the counter.

CARRY-OUT and CARRY-IN are when you want to cascade two or more counters.
CARRY-OUT is the overflow from the first counter. CARRY-IN on the next counter is connected to CARRY-OUT from the previous counter.