Announcements
Community Announcement : Welcome to the NEW Cypress Developer Community.
cancel
Showing results for 
Search instead for 
Did you mean: 

PSoC 4

Anonymous
Not applicable

PRoC datasheet says that "24-MHz crystal or external clock input" at XTAL24I pin. I want to use external clock input. So :-

   

1. What characterstics does the clock must have?

   

2. In that case should XTAL24O pin be connected to ground?

   

3. What necessary termination does this clock input needed at PRoC?

   

I have read "AN95089" (www.cypress.com/). But didn't found answer of theses questions. Pls help.

0 Likes
1 Reply
ETRO_SSN583
Esteemed Contributor

1. What characterstics does the clock must have?

   

 

   

From CYBL10X7X Family Datasheet

   

 

   

   

2. In that case should XTAL24O pin be connected to ground?

   

 

   

Looking at TRM there are no recommendations, suggest you file a CASE -

   

 

   

    

   

         

   

www.cypress.com

   

“Support”

   

“Technical Support”

   

“Create a Case”

   

 

   

 

   

3. What necessary termination does this clock input needed at PRoC?

   

 

   

None, although you might consider 10 - 30 ohms in series to the clkin pin to

   

dampen ringing. Normal practice on high speed clocks.

   

 

   

Regards, Dana.

0 Likes