crystal oscillator connection

Thread Starter

neeladrinath

Joined Apr 5, 2017
37
Hii
If I take a 16 MHz crystal oscillator connect it with 33 pf capacitor and ground just like we are connecting in microcontroller circuit but instead of taking two outputs take one output and give it to a clock pin of some device then will it work ?
 

BR-549

Joined Sep 22, 2013
4,928
Maybe...maybe not. That's why they make datasheets for all the devices. The datasheet shows how to connect the clock input for that device. Some are similar and some are not.
 

MrChips

Joined Oct 2, 2009
34,638
Hii
If I take a 16 MHz crystal oscillator connect it with 33 pf capacitor and ground just like we are connecting in microcontroller circuit but instead of taking two outputs take one output and give it to a clock pin of some device then will it work ?
Will it work? Depends on the actual component you are trying to use.
There are two kinds of crystal oscillator circuits.

1) There is a two-terminal passive component called a quartz crystal. For this to oscillate you need an oscillator circuit to drive the crystal. A microcontroller that uses an external crystal has the oscillator circuitry built-in on the chip. You can also build your own oscillator to make this work with a crystal.

2) There is a three-terminal active component (sometimes it may come with more than three leads) called a crystal oscillator. This component has the quartz crystal and the oscillator circuity built-in in the can. Two pins are for supply Vcc and GND. A third pin is the output signal. It does not require a capacitor on the output pin.

If you do not require the stability that a quartz crystal oscillator has to offer, you can build a simple RC oscillator to drive a CLOCK input.
 

Thread Starter

neeladrinath

Joined Apr 5, 2017
37
It means that,that white color oscillators available in market with two radial lead are quartz crystals. But how is the crystal oscillator. Do you have any image of three pin crystal oscillator ? Can you share here Please.
 

RichardO

Joined May 4, 2013
2,270
It means that,that white color oscillators available in market with two radial lead are quartz crystals. But how is the crystal oscillator. Do you have any image of three pin crystal oscillator ? Can you share here Please.
Can you post a picture of one of these?
 

DickCappels

Joined Aug 21, 2008
10,661
It will not oscillate on its own but can be used to set the frequency of an oscillator or to filter a signal when used in conjunction with other components.
 

DickCappels

Joined Aug 21, 2008
10,661
Yes, but usually inverters without hysteresis are used.

Using a Schmitt trigger as shown the circuit can oscillate even if the crystal is defective or missing. For some applications this might seem to be a feature while in other applications it might be seen as a hazard.
 

DickCappels

Joined Aug 21, 2008
10,661
Yes, such as the CD4049 or similar. Non-buffered (series A) versions are less likely to give problems than buffered (series B) types. For example: CD4049A
 
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