Hello guys,
I want to use a 4047 as an Astable at say 10Mhz, but have no idea If the chip is able to support that frequency or not? Sorry the datasheet was not help full. My chips are labeled as CD4047BE & HCF4047BE
Thanks for any help.
Thanks, So it is impossible to reach that freq with the said chip.
I have seen a circuit used 555 IC as an Astable mode. It had a 1PF ceramic connected to pin2 and ground, It used a 82k resistor for pin6 and pin2&6, the resistor which was connected to pin7 and the positive rail was a 6.8k, I guess those values give a freq of almost 8Mhz, right? If so , is a 555 reaches to that high frequencies at all?
Thanks, So it is impossible to reach that freq with the said chip.
I have seen a circuit used 555 IC as an Astable mode. It had a 1PF ceramic connected to pin2 and ground, It used a 82k resistor for pin6 and pin2&6, the resistor which was connected to pin7 and the positive rail was a 6.8k, I guess those values give a freq of almost 8Mhz, right? If so , is a 555 reaches to that high frequencies at all?
that is not a problem... that is what regulators are for... to many people use 4xxxx parts to try and short cut designs
you have to ask yourself what you NEED and WHY. 12V is really weird for a 10MHz system. the only thing i can think of of hand is some screwy, ill advised, jury rigged PWM that needs the counter running that fast to drive a FET gate.
if something like that is the case run the logic at 3V and use a FET driver, that is what they are for.