I've been trying to figure out the lower input bound for the LM567/NE567 tone decoder. Supposing the pin 7 is connected to ground, is the minimum input voltage 0V or can it go negative?
In the datasheet (poorly written BTW) the input pin is always AC-coupled using a capacitor, so I guess this suggests the voltage can indeed go negative. The datasheet says the upper bound is Vcc+0.5V, I was wondering if the lower bound is GND+0.5V.
The input signal I'll use on it has a DC offset level. So if there's no coupling capacitor, could the IC get damaged by the DC offset (when no AC component)?