It provides Ramp, Pulse/Square, and Triangle outputs, has inputs for oscillator sync, 
is temperature compensated and stable, and provides excellent 1V/Oct tracking.
In short, it’s everything you need from an analog oscillator, on a chip.
There hasn’t been a better design than the 3340.

Please note that Alfa recommend a 51K resistor on the pulse output in place of 
the 10K resistor that the CEM3340 used. There seem to be some subtle differences 
between the Alfa chips and CEM originals, particularly with respect to pulse width. 

We’ve had one or two reports of difficulties replacing dead/missing 
CEM3340s with AS3340s. For this reason, if you’re repairing a vintage synth, 
we recommend using CEM3340 Rev.Gs rather than replacing with Alfa AS3340s.
Check my other auctions for Cem3340 Rev-G