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Need help: One shot circuit

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yoyo

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cd4013 one shot

I need to find a logic circuit with output High upon power up. The output will be Low when a pulse is applied to the input. The output will stay Low even subsequent pulses apply to the input. The 555 monostable doesnot work. Any idea???
 

shawndaking

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why don't you just use a power monitor device

something like MAX706 (DS1706) ?
 

barrybear

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the 555 circuit should work .
Use bias components to produce a pulse on 555 power up. Us second 555 to reset pin of first to disable it.
Barrybear
 

bluelaser

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use the cd4013 flip-flop

use the clk pin for the input, Q pin for the output,
about the detail message you can refer to the datasheet of cd4013
Hope it can help you.
 

bluelaser

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sorry for not understanding your meaning

the cd4013 can't keep low when the other pulse come in.sorry!
 

yoyo

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Thanks all!
Sometimes 4013 works, sometimes it does not, I guess depending on output Q. I am not sure how 555 is set up. Not sure if Reset pin of Max706 will stay Low after the first input pulse, whether or not subsequent pulses apply.
 

coppervaporlaser

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why not use the good old LS123 dual retriggerable one shot ...
 

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