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Low-power clock generation

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elockpicker

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Hi everybody,

Is there any IC (or something) that generates ultra low-power clock signal (less than 10MHz) ?
I mean it consumes very little power and generates a clock signal.

Are crystal based clock generators considered low-power?

Thank you
 

What do you consider low power respectively ultra low power? What are your additional requirements for the clock signal?
 
The clock frequency should be between 1Mhz and (almost) 10MHz.
The supply voltage should be between 1.2v and 3.3v
IO levels of clock signal should between 1.2

It's gonna drive a low power FPGA from Actel (Igloo series) so i think it should consume a very small amount of power.

Thank you in advance
 

Some industry standard crystal oscillators have supply currents below 10 mA. If you want much lower currents, you possibly need to design your own circuit.
 

Thank you,

but I need something that consumes current in order of uA ? Is there such a thing available?
 

The current consumption of the active (clock supplied) Actel FPGA will be surely higher than a few uA. But I agree, that you may want to design your own crystal oscillator. A low voltage (e.g. 1.2V supply) unbuffered inverter CMOS would be promising in my opinion.
 
Do you mean the usual (simple) crystal and Not Gate oscillators using a low power CMOS inverter ? is such inverter available as a discrete component?
Thank you
 

See LVC single gate unbuffered inverters, that can work down to 1.8V
https://www.ti.com/lit/ds/symlink/sn74lvc1gx04.pdf
https://www.ti.com/lit/ds/symlink/sn74lvc1gu04.pdf

AUP family, has even lower power dissipation capacitance and can work at 1.2V, unbuffered inverters are available from NXP


The problem is, that usual crystal load capacitors involve a much higher power dissipation than the internal AUP capacitances. For minimal power disspation, you may want to accept a small frequency offset and reduce the crystal load capacitance.
 
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