Hi there,
I was asking one of my lecturers about the 4059 divider IC, he said the HEF4059 IC happen to work in 3 different Vin, which is 5V, 10V and 15V. Is this true? I did check the datasheet, I can't really confirm this.
the datasheet:
https://www.electro-tech-online.com/custompdfs/2009/03/14383-1.pdf
Yes, we already discussed the possibility of using a higher voltage on HEF4059 or CD4059 several posts ago. In fact, the HEF part works at any voltage up to 18 volts and the CD4049 is ok up to 15 or 20 volts depending on which manufacturer you use. The data sheet provides performance figures for HEF4059 at 5, 10 and 15 volts but it works throughout the range. In CMOS technology the higher the voltage, the faster the flip flops can toggle so the higher the input frequency. The old 4000 series were specified up to 15 volts, but 74HCxxx is designed to run at 5V and is ok up to 6V maximum.
The trouble is that the 4046 phase locked loop IC that you are working with is the 74HC4046 type and it only works up to 6V. It would not be able to interface directly to a 4059 running at 15 volts without some additional circuitry. However, I note that while the CD4059 is quite slow, the HEF4059 is much faster. The data sheet for the HEF4059 implies that it will work at 10MHz with a power supply voltage of about 7.5 volts and may work well below 7 volts.
I think that you can solve this problem by operating both the 74HC4046 and the HEF4059 at 6.0 Volts. If you find that the 4059 is struggling to reach 10MHz, you can raise the voltage of just that chip to 7 volts using a second DC power supply. In this case, we would have to add a little bit of extra circuit to interface the counter output back to the 4046 COMP input. There is no extra circuitry needed for interfacing the 4046 VCO output to the 4059, that will work fine. Signals coming from the 4059 back to the 4046 would be too high in voltage so would require a buffer amp or some sort of simple voltage limiter circuit (which is possible using two diodes and a resistor). There is a chance that this won't be needed, so I would first build it for 6 volts and see if it works up to 10Mhz.
(note: the 74HC4059 from some manufacturers say that the absolute maximum supply voltage is 7 volts and they recommend operation up to 6 volts. This means that if you are willing to risk burning out your chip, you can also turn the voltage on this IC up to almost 7 volts, carefully. If this is successfull then extra circuitry won't be needed between the two chips).