The CD4009 is an obsolete inverting buffer. It has two positive power supply pins and the IC will self-destruct if they power-up in the wrong sequence. Its output current is fairly high when sinking but is fairly low when sourcing.
A CD4049 should be used instead if you want a inverting buffer. Its output current is very high when sinking and is high when sourcing.
A CD4069 is an ordinary Cmos inverter with symmetrical sinking and sourcing current outputs.
A CD4049 should be used instead if you want a inverting buffer. Its output current is very high when sinking and is high when sourcing.
A CD4069 is an ordinary Cmos inverter with symmetrical sinking and sourcing current outputs.