Need help: One shot circuit

[yoyo]

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]

why don't you just use a power monitor device

something like MAX706 (DS1706) ?

 

[barrybear]

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]

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]

sorry for not understanding your meaning

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

 

[yoyo]

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]

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