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4 pin vs. 2 pin crystal (3.57MHz)

F

Farce Milverk

Jan 1, 1970
0
Hi,

I have 2 crystals rated at 3.57 MHz (for driving video)

One is 2 pin, and the other is a 4 pin. I have the 4 pin working, but not
the 2 pin -

I am looking for info on how to substitute a 2 pin in place of a 4 pin.

thx,
Farce
 
F

Farce Milverk

Jan 1, 1970
0

Hi John,

Can you point me to info on why this is the case?

Thanks!

Farce
 
R

Ross Herbert

Jan 1, 1970
0
Hi John,

Can you point me to info on why this is the case?

Thanks!

Farce
What John means is that the 4 pin device you have is an active
oscillator while the 2 pin device is simply a crystal which requires
other active components to get it to oscillate. The 4 pin oscillators
are commonly used to produce clock signals for IC devices. 2 of its
pins are simply to provide + and - power for the internal oscillator
which uses a crystal to set the frequency. The 2 pin crystal doesn't
have the oscillator part so you need to provide it.
 
F

Farce Milverk

Jan 1, 1970
0

Great explanation thanks. I have one more question:

Does the 2 pin have a Pin 1 identifier?
Or is this a component that doesn't care?
I see XTAL and EXTAL in the schematic, but don't understand what this means?
 
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