4018 Div by N - help needed

[Phideaux]

I need a little help from someone with experience with this particular
IC. I am using it along with two 4017 decade counters to divide a
clocked input by 700 and then send a positive pulse out to reset the
circuit. I've never used this chip before and am a little puzzled as
to the proper set-up. You know us mechanical people, a little slow on
the up-going stroke. Thanks in advance.

 

[George]

ggober@alltel.net (Phideaux) wrote in message news:<fd732a29.0401030710.721e7d31@posting.google.com>...

I need a little help from someone with experience with this particular
IC. I am using it along with two 4017 decade counters to divide a
clocked input by 700 and then send a positive pulse out to reset the
circuit. I've never used this chip before and am a little puzzled as
to the proper set-up. You know us mechanical people, a little slow on
the up-going stroke. Thanks in advance.

http://www.jameco.com/Jameco/Products/ProdDS/12773.pdf
This data sheet has how to set up the 4018 to divide by 7 on the 6th
page of the pdf. It shows the complete circuit. You need two NAND
gates (or one and an inverter, but just link the inputs of a NAND gate
to get an inverter). Feed the CL/7 output from 4018 (its on the
circuit diagram on the data sheet)into the clock pin of a decade
counter and feed the "9" pin (pin 11 on the DIP I've seen) from that
into the clock pin of the second decade counter. The "9" pin (pin 11
again) from that will output a pulse on the 700th clock cycle put into
the 4018 clock pin. Hope this helps.
George
P.S. the data sheet for the 4017 is:
http://www.jameco.com/Jameco/Products/ProdDS/12749.pdf

 

[George]

Geodanah@yahoo.com (George) wrote in message news:<7c28d4ba.0401031720.5065d4ff@posting.google.com>...

ggober@alltel.net (Phideaux) wrote in message news:<fd732a29.0401030710.721e7d31@posting.google.com>...
I need a little help from someone with experience with this particular
IC. I am using it along with two 4017 decade counters to divide a
clocked input by 700 and then send a positive pulse out to reset the
circuit. I've never used this chip before and am a little puzzled as
to the proper set-up. You know us mechanical people, a little slow on
the up-going stroke. Thanks in advance.

http://www.jameco.com/Jameco/Products/ProdDS/12773.pdf
This data sheet has how to set up the 4018 to divide by 7 on the 6th
page of the pdf. It shows the complete circuit. You need two NAND
gates (or one and an inverter, but just link the inputs of a NAND gate
to get an inverter). Feed the CL/7 output from 4018 (its on the
circuit diagram on the data sheet)into the clock pin of a decade
counter and feed the "9" pin (pin 11 on the DIP I've seen) from that
into the clock pin of the second decade counter. The "9" pin (pin 11
again) from that will output a pulse on the 700th clock cycle put into
the 4018 clock pin. Hope this helps.
George
P.S. the data sheet for the 4017 is:
http://www.jameco.com/Jameco/Products/ProdDS/12749.pdf

Oops I reread the timing diagram and hook up the "0"pin of the 4017s
not the "9". Either that or detect the rising edge of the carry out
pin.

 

[George]

Geodanah@yahoo.com (George) wrote in message news:<7c28d4ba.0401031720.5065d4ff@posting.google.com>...

ggober@alltel.net (Phideaux) wrote in message news:<fd732a29.0401030710.721e7d31@posting.google.com>...
I need a little help from someone with experience with this particular
IC. I am using it along with two 4017 decade counters to divide a
clocked input by 700 and then send a positive pulse out to reset the
circuit. I've never used this chip before and am a little puzzled as
to the proper set-up. You know us mechanical people, a little slow on
the up-going stroke. Thanks in advance.

http://www.jameco.com/Jameco/Products/ProdDS/12773.pdf
This data sheet has how to set up the 4018 to divide by 7 on the 6th
page of the pdf. It shows the complete circuit. You need two NAND
gates (or one and an inverter, but just link the inputs of a NAND gate
to get an inverter). Feed the CL/7 output from 4018 (its on the
circuit diagram on the data sheet)into the clock pin of a decade
counter and feed the "9" pin (pin 11 on the DIP I've seen) from that
into the clock pin of the second decade counter. The "9" pin (pin 11
again) from that will output a pulse on the 700th clock cycle put into
the 4018 clock pin. Hope this helps.
George
P.S. the data sheet for the 4017 is:
http://www.jameco.com/Jameco/Products/ProdDS/12749.pdf

Use the carryout pin. After more reading, the 4017 detect the rising
edge of the clock. That means the carryout pin will work well. Just
make sure you ignore the initial pulse on reset.