On the TMDS261B/TMDS251, if the input/sink SCL, SDA, HPD pins are not used, can they be left unconnected?
I would not float these inputs. Please connect through an appropriate pullup to the local rail not exceeding voltage requirements. So, I would tie the HPD input (from the receiver) to 3.3 through a 10k ohm resistor, a 47k pullup to 3.3 on the SCL/SDA input/output for the SCL/SDA sink and a 47k to 5V for the SCL/SDA(1,2).
Can SCL/SDA(1,2) be pulled up to 3.3V instead of 5V?
Yes
One more thing on these parts. I was looking for the product markings. It used to be a pop up from the product folders. Now there is a new link. The only thing it shows is just the part number, not date codes etc. is this correct? Am I missing something?
I found a link for it: http://focus.ti.com/general/docs/partmarking/partmarkinghome.jsp TMDS261B: 2 to 1 HDMI switch Product Folder: http://focus.ti.com/docs/prod/folders/print/tmds261b.html Data sheet (PDF): http://focus.ti.com/lit/ds/slls987/slls987.pdf TMDS251: 2-to-1 HDMI Switch Product Folder: http://focus.ti.com/docs/prod/folders/print/tmds251.html Data sheet (PDF): http://focus.ti.com/lit/ds/slls852/slls852.pdf
I found a link for it:
TMDS261B: 2 to 1 HDMI switch
Product Folder:
Data sheet (PDF):
TMDS251: 2-to-1 HDMI Switch
Wayne,
The Pop-up is still there:
Click on View and you get:
Regards, Dan
that worked, must of had my pop-up blocker on. Seems like the product folder is the way to go so I will jsut use that. Is the part marking lookup page something that still needs populating? The bottom of the product folder takes you here.
http://focus.ti.com/general/docs/partmarking/partmarkinghome.jsp
I interpret that page to be a "reverse" lookup page - you have a part wnd know the marking and what to figure out what part it is...