| Electronics > Beginners |
| is it fine to have floating pin with NE555 set for VCO |
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| Ian.M:
Why would you even need to do that? Its open collector (or open drain for a CMOS 555) so you can simply tie it to ground. If you need to bring Discharge out as an external connection from your complete circuit, a 50mA polyfuse in series and a suitable voltage rating unidirectional TVS diode shunting it to ground would probably be the best option for ESD and over-current protection with minimum interference with its normal function. |
| Gyro:
Sorry, I didn't notice that the discussion had moved on from the 555 discharge pin to something more generic. Yes, of course grounding it would be simpler (in fact suggested earlier in the tread). |
| T3sl4co1l:
Not to forget that, if your core circuitry is subject to ESD, you've already failed in some spectacular and embarrassing way. Tim |
| Zero999:
Yes, of course it can be damaged by ESD, if left open, but it's quite unlikely, unless it's connected to a long PCB trace. If it makes the PCB layout more difficult, then I wouldn't bother grounding it, otherwise if it makes no difference to the PCB, ground it. |
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