Uhoh..just realized something (that should have been obvious to me
before). My battery is only 1.2v, so is there a flipflop that I can use
that will run that low?

Josh
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Herbert Graf wrote:
> > You don't really have to design a FF, you can just get one from
> > TI for example
> > (www.ti.com/sc). Keep in mind, if you are using any rails in your
> > circuit >5V,
> > you will need to stick a NPN transistor on the output of your FF
> > to switch on
> > the P-channel mosfet. If you are just using +5 lines, then you are ok.
>
>         Huh? Why? A PMOS transistor used as a high side switch needs Vdd-Vth to
> turn on, since the output of the FF will be 0V at a point that should be
> enough to turn on the PMOS transistor. Of course, if Vth is higher then 5V
> then you have a problem, but I don't see how an NPN transistor would help
> there.

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