I need to get a square wave and voltage levels are similar LVTTL input levels using a crystal.

How can I do this? what is the easiest way?

 

Use an LVTTL IC with inverting amplifiers in it, like a quad NAND.

 

Use an LVTTL IC with inverting amplifiers in it, like a quad NAND.

But it doesn't include a crystal. Isn't it?
I need to use a crystal because I need a higher stability and accuracy in the square wave.

 

Nothing includes a crystal except a crystal. You must actually have a crystal to make a crystal oscillator.

These are complete LVTTL crystal oscillators for $10.13 plus shipping.

http://www.mouser.com/Passive-Compo...Clock-Oscillators/_/N-7jdva?P=1yzrl9fZ1yzmyyl

 

Intersil make an IC that just needs a crystal to be a square wave oscillator.

 

www.z80.info/uexosc.htm

 

use crystal oscillator then run the signal through gate with Schmidt trigger. it will square it even if input was sine wave. if you want 50% duty cycle, add flipflop. there is tons of circuits that produce signal you require. if the frequency need some adjustment, use PLL chip.

 

use crystal oscillator then run the signal through gate with Schmidt trigger. it will square it even if input was sine wave. if you want 50% duty cycle, add flipflop. there is tons of circuits that produce signal you require. if the frequency need some adjustment, use PLL chip.

Can you explain bit more?
Yeah. I need a square wave with 50% duty cycle.


I implemented the circuit shown in the following figure which is designed for TTL. It worked fine with TTL 7404 IC.

Link to the web page: http://www.eleccircuit.com/crystal-oscillator-using-ttl/

But it didn't work with the NOT gates implemented using the Altera MAX ii CPLD (LVTTL).
Any suggestion to make it work with LVTTL? Is it possible to make it work with LVTTL by changing the R1 and R4 values?

 

www.z80.info/uexosc.htm

All the circuits are designed for TTL devices instead of LVTTL. The previous one which is designed for TTL is didn't work with LVTTL. (refer the previous post). Will these circuits work with LVTTL?


Guys!! Any Idea please?

 

All the circuits are designed for TTL devices instead of LVTTL. The previous one which is designed for TTL is didn't work with LVTTL. (refer the previous post). Will these circuits work with LVTTL?


Guys!! Any Idea please?

Use a CD4069 chip it will work on 3 v, or use a a LVTTL

 

Use a CD4069 chip it will work on 3 v, or use a a LVTTL

Will those designs work with the NOT gates implemented on a FPGA which has LVTTL?

 

Will those designs work with the NOT gates implemented on a FPGA which has LVTTL?

As i have never worked on FPGA's , i cant give you an answer, i can only assume if they have inverter gates separate to the chip, they may work, try it and find out.

 

I believe this circuit needs a series resonant crystal.