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Divide by N parallelling diodes

K

Kevin Brooks

Jan 1, 1970
0
I am using a CD4040 to divide down a clock frequency. I would like to
connect several outputs in parallel with diodes to make their divisors
additive. The output is then between their common and a 1M pull-up
resistor.

I have tried everything I can think of to make this work. I am tying
reset to ground, but something tells me this is not right. What I get
doing this is a pulse train, with each pulse less than 50% duty cycle.

Unable to find anything online. Can somebody tell me the proper way?

Thank you,

Kevin Brooks
 
G

GPG

Jan 1, 1970
0
I am using a CD4040 to divide down a clock frequency. I would like to
connect several outputs in parallel with diodes to make their divisors
additive. The output is then between their common and a 1M pull-up
resistor.

I have tried everything I can think of to make this work. I am tying
reset to ground, but something tells me this is not right. What I get
doing this is a pulse train, with each pulse less than 50% duty cycle.

Unable to find anything online. Can somebody tell me the proper way?

Thank you,

Kevin Brooks

Put a pullup on the reset and connect diodes, anode to reset, to the
outputs. Use 2nd MSB as output.
 
G

GPG

Jan 1, 1970
0
Put a pullup on the reset and connect diodes, anode to reset, to the
outputs. Use 2nd MSB as output.

Should be MSB-1 output
 
R

Robert Baer

Jan 1, 1970
0
Kevin said:
I am using a CD4040 to divide down a clock frequency. I would like to
connect several outputs in parallel with diodes to make their divisors
additive. The output is then between their common and a 1M pull-up
resistor.

I have tried everything I can think of to make this work. I am tying
reset to ground, but something tells me this is not right. What I get
doing this is a pulse train, with each pulse less than 50% duty cycle.

Unable to find anything online. Can somebody tell me the proper way?

Thank you,

Kevin Brooks
That scheme cannot possibly work.
Get a sheet of graph paper and draw a number of signal lines; the
first being the (clock) data input line and the others erpresenting the
outputs of interest.
Use the datasheet for help.
 
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