Pin 4 if not used should be tied high. Pin 5 should have a 0.01uf cap to
ground on it.
Rick

Steve Kasm wrote:

> Hello All,
>
> I have a 555 timer design that doesn't use the Control Voltage pin on
> the 555,
>
> What is the proper termination if this pin is not used, can it be left
> floating or should
>
> I tie it to Vcc or Gnd?
>
> Regards,
>
> Steve
>
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