square wave generator with 50 % duty cycle

[morshed005]

I want to make a perfect 100 kHz pulse with 50 % duty cycle. If a perfect 200kHz pulse can be generated, I know how to make it 100 kHz perfect 50 % duty cycle with flip flop. So I want the best solution to make a 200 kHz pulse generator. Does 555 timer (bipolar one) make a perfect 200 kHz pulse?
In the datasheet I didnot find any specs

 

[kam1787]

try google: thousands of circuits using the 555 exist. yes it can create 50% duty cycle 200kHZ square wave. Do you want A pulse or square wave generator?

**broken link removed**
http://www.aldinc.com/pdf/time_15002.0.pdf
http://www.electroschematics.com/5834/pulse-generator-with-555/
http://www.electronics-tutorials.ws/waveforms/555_oscillator.html
**broken link removed**

 

[morshed005]

what is the difference between pulse and square wave? i wanted to know whether 555 timer can produce that frequency correctly. thank you, kam1787 for your quick reply.

 

[kam1787]

to me,

a pulse is single event - a single pulse
square wave generator or Astable Multivibrator generates a stream of pulses

yes the 555 can work at 200kHZ but if you want a 'perfect' square wave generator you ought to look at a higher performing IC or discrete design

 

[crutschow]

Generating a 400kHz signal with a 555 and running that through a toggle flip-flop will make a 200kHz perfect square-wave.

 

[E-design]

You can use a 4060 with a 3.2, 6.4 MHz ... crystal connected clock (see the data sheet) divided down to 200 kHz and then a flip-flop to get the 50% duty cycle.

 

[morshed005]

thank you, guys. your ideas are working for me right now

 

[morshed005]

i am trying 4060. but in proteus i just dont get any pulse. i have been using 3.2 MHz crystal. but proteus model is not giving any pulse. how to solve this? i have used the resistors and capacitors value as given in the image except the crystal of 3.2 MHz

 

[E-design]

Do you have a valid model for the crystal? Most simulators have a hard time to simulate crystal circuits due to the high Q of the crystal requiring long simulation times. Post your design file, so we can look at it.

Below, I have substituted the crystal by a lower Q LC circuit. As you can see it simulates well in Multisim.