wtb: USB host controller - Page 1
Forum section: electronics / general

author: CrashO
author_rank: Unknown
timestamp: April 22, 2015, 10:01:29 am
content: Hi,I have been looking for a pci-express usb 3 host controller for a while and finally landed on a suitable IC to implement some embedded usb-based stuff directly on a pcie x1 port.TheµPD720201from Renesas / Nec fits this bill. However, it isn't in stock anywhere. Lead times at every supplier I can find that sell it (arrow, digikey) are around december 2015..Does anybody know where to find this IC in stock? I only need one or two of them.Or any comparable IC (4 channels usb 3, pcie) that might have better availability?

author: wraper
author_rank: Unknown
timestamp: April 22, 2015, 10:32:04 am
content: For one off you might consider to just buy some USB 3.0 card and salvage the IC from therehttp://www.amazon.com/Tenext-SuperSpeed-Controller-Fulfilled-%C2%B5PD720201/dp/B00IB40MT6.

author: wraper
author_rank: Unknown
timestamp: April 22, 2015, 10:35:48 am
content: Or get it from taobaohttp://item.taobao.com/item.htm?spm=a230r.1.14.6.KveeQ4&id=43876886622&ns=1&abbucket=13#detail

author: CrashO
author_rank: Unknown
timestamp: April 22, 2015, 09:39:42 pm
content: Quote from: wraper on April 22, 2015, 10:32:04 amI shortly considered this before starting the thread here. But it seems the more expensive option and the chip is a QFN package with a nice big ground plane. Those are a real pain to remove without damaging it (for me atleast)

author: Monkeh
author_rank: Super Contributor
timestamp: April 22, 2015, 09:47:41 pm
content: Digikey have TI host controllers in stock:http://www.digikey.com/product-detail/en/TUSB7340IRKMT/296-36013-1-ND/4135110

author: photon
author_rank: Frequent Contributor
timestamp: April 22, 2015, 10:31:19 pm
content: VIA has onehttp://www.via-labs.com/product_show.php?id=41,but getting the silicon may be harder than getting the TI silicon, I think. I found it less reliable than TI or Renesas, but it was more than 3 years ago when I tested them.

author: CrashO
author_rank: Unknown
timestamp: April 23, 2015, 08:32:00 pm
content: Quote from: Monkeh on April 22, 2015, 09:47:41 pmGoing to go with these. They seem great for me (and available)@photonI looked at them before this thread, and as you mentioned, availability seems an issue with them. I couldn't fine any distributor for them.

author: CrashO
author_rank: Unknown
timestamp: April 23, 2015, 09:14:32 pm
content: Quote from: blueskull on April 23, 2015, 08:50:28 pmVIP?I do have access to (and plan on using) a reflow oven (a LPKF) for the soldering and a stencil for the paste. I was not expecting any issues for soldering a dual row qfn with those. Should I? (I have only soldered single row versions of qfn before)

author: Howardlong
author_rank: Super Contributor
timestamp: April 24, 2015, 12:19:36 am
content: That sucks, either via in pad or 4mil track and gap would work to fan out if you follow their land plan to the letter. If you are a bit tighter on the outer pads you could get away with 5mil.Problem with inner pads is knowing whether you're connected or not, you should just about be able to visually inspect with a microscope.Via in pad is a specialised process because unless the via is filled by some means your solder paste will be wicked away. I've not seen it available in pool processes myself.I would make the outer pads 0.6x0.225mm instead of the recommended 0.6x0.25mm and use 0.125mm track and gap (5mil) which can be had in pool services. At least the outer pads are to the chip edge so are easy to check.

author: Monkeh
author_rank: Super Contributor
timestamp: April 24, 2015, 12:27:46 am
content: The difference in pitch is a mild pain in the arse. Sadly that's not a package suited to reducing the size of the flag pad.