Just trying to keep up on e-mail here.
Looks like we could go the 74LV route. I hoping that the Mylium outfit soon comes up with their next Xilinx Spartan 6 controller. That one is supposed to have a resolution of 1920 X 1080. Will need a proper DAC etc. and will probably go with the above interface chips.
John
John Monahan Ph.D
e-mail: mon...@vitasoft.org
Text: mon...@txt.att.net
From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of yoda
Sent: Sunday, January 06, 2013 1:20 PM
To: n8vem...@googlegroups.com
Subject: Re: [N8VEM-S100:1286] LAVA-10 Zener Diode = 1N5226 (3.3v)
Actually the 74lvc244 and 74lvc245 are easier to find and cheaper I believe
On Sunday, January 6, 2013 2:01:28 PM UTC-6, lynchaj wrote:
Hi! Is the 74LVxxx logic available in PDIP?
I guess so…
http://www.digikey.com/scripts/dksearch/dksus.dll?k=74LV374&vendor=0&mnonly=0&newproducts=0&ptm=0&fid=0&quantity=0&PV16=6524
Wow! That would simplify things!
Thanks and have a nice day!
Andrew Lynch
why not use 74lvxxx logic to interface to the lava board ? - it does the protection and is 5V tolerant - it has been used in propeller interfaces for the same thing and makes the parts count a lot smaller
On Sunday, January 6, 2013 11:51:09 AM UTC-6, lynchaj wrote:
Hi Paul! Thanks! Yes, the 3.3VDC Zener diodes are added after the 100 ohm
resistors for 5V to 3.3V level transition. In theory you don't need them
and adding the Zeners are kind of a "belt and suspenders" approach to level
transition. However the LAVA-10 is one expensive component so it is worth a
the extra expense to protect it. I'd consider them optional but a worthy
investment even if not needed.
Thanks and have a nice day!
Andrew Lynch
> -----Original Message-----
> From: n8ve...@googlegroups.com [mailto:n8vem-
> s1...@googlegroups.com] On Behalf Of Paul Birkel
> Sent: Sunday, January 06, 2013 2:50 AM
> To: n8ve...@googlegroups.com
> Subject: [N8VEM-S100:1271] LAVA-10 Zener Diode = 1N5226 (3.3v)
>
> Is it intended that 1N5226 (3.3v) Zener diodes be used for the logic-level
> shifting circuits (with the 100 ohm resistors)?
>
> -----