The pinout of a 4069UB and 74C14 are identical.
Both chips have the same driving capability - about 5 - 10mA per output for a voltage 6v or higher.
If you need a larger driving current, use a transistor "buffer" called a Driver Transistor.
The main difference between the two chips:
Each inverter in a 4069 will
amplify a very small analogue signal (less than 1mV) and produce an
analogue output. It will have a gain of approx 20.
The 4069 has an ANALOGUE OUTPUT when configured as an amplifier (as shown above).
If one of the inverters of a 4049 has no components connected between output and input, the output will go LOW when the input reaches mid-rail voltage. When the input voltage falls slightly below mid-rail, the output will go HIGH. This change occurs when the input voltage changes by only a few millivolts.
GATING AN OSCILLATOR
An oscillator can be made to turn ON and OFF via a "gating signal." This gating signal can be a push button or a pulse from the output of another gate.
In the diagram below, the high-frequency oscillator (the second section), is gated via the low-frequency oscillator:
When the gating diode is placed as shown in the diagram above, the output is LOW when the oscillator is gated (frozen). If the gating diode is reversed, the output will be HIGH when the oscillator is frozen.