1 Mhz oscillator needed

[tdia]

Hi im building a new project but I need a square wave signal with frequency as close as possible to 1 MHz with voltage not less than 1v

I thought of the 555 timer but with such a high frequency the signal is totally malformed so please help me send me schematics or IC number that can generate 1MHz comfortably
thanks for your help

 

[duke37]

Look at the CMOS 4047.
This will give a square wave with amplitude close to the voltage supply but will have very little current capability.
If frequency accuracy is important, then a crystal oscillator is called for.

 

[(*steve*)]

I'd scour some old electronics for an oscillator module. They're typically metal and have a DIL-14 pinout -- except with just 4 pins. They are clearly marked with the frequency on the top.

You probably won't be lucky enough to get one that id exactly 1Mhz, but look for something that is a simple power of 2 times 1MHz (2, 4, 8, 16 MHz).

Then look at divider chips and wire on e f those up to divide it down to 1MHz.

You can divide by other than a power of 2, but dividing by that pretty much ensures a nice 50% duty cycle output.

 

[KrisBlueNZ]

http://www.digikey.com/product-detail/en/FXO-HC735-1/631-1122-1-ND/1868762 (3.3V supply, SMT)
http://www.digikey.com/product-detail/en/MXO45HS-3C-1M0000/CTX745-ND/1801860 (5V, THT)

 

[Zork]

There are many solutions for your problem, if you want a square wave, the oscilator can be done by a 74LS04 and a higher frequency crystal and a counter to lower the frequency, another idea is to use the 74HC4060 with a crystal and this can do the job with 50% duty cycle and only one ic.

 

[Miguel Lopez]

I support Zork's words. Use a xtal.
If you don't have a 4060 ic, then you can use a 1MHz xtal and build the oscillator using inverter gates.

 

[CDRIVE]

http://www.digikey.com/product-detail/en/FXO-HC735-1/631-1122-1-ND/1868762 (3.3V supply, SMT)
http://www.digikey.com/product-detail/en/MXO45HS-3C-1M0000/CTX745-ND/1801860 (5V, THT)

I can't think of any solution easier than this with the exception of a kit.

Chris