4046, 744046 Phase Locked Loop. +----------+ PCPout |1 +--+ 16| VCC PC1out |2 15| Zener PCinB |3 14| PCinA VCOout |4 13| PC2out /EN |5 4046 12| R2 C1A |6 11| R1 C1B |7 10| SFout GND |8 9| VCOin +----------+ [This information is part of the GIICM]