[tech] Octal high side driver from STMicro

[Nick Bannon]

On Tue, Nov 14, 2006 at 02:54:00PM +0800, Harry McNally wrote:
> The right one:
> http://www.st.com/stonline/products/literature/ds/11456/vn808cm-e.htm#

Great!

> Datasheet:
> http://www.st.com/stonline/products/literature/ds/11456.pdf
> 
> And DigiKey have them:
> http://www.digikey.com/scripts/dksearch/dksus.dll?KeywordSearch&Site=US&Vendor=497&MPart=VN808CM-E
> 
> The 74HC595 is _almost_ an appropriate shift register to partner with
> the driver to replicate the failed part. The issue is that the gate
> signal tristates the outputs (so they could be setup to turn off by
> adding eight pull-down resistors) _but_ the data can only propogate from
> the shift register to the output latches on a rising RCLK (see data):
> http://www.fairchildsemi.com/ds/MM/MM74HC595.pdf
> 
> It may be easier to use a 3.3volt regulator and a small Xilinx CPLD like:
> http://www.xilinx.com/bvdocs/publications/ds091.pdf
> This is overkill but the CPLDs don't get much smaller these days :-/
[...]

On Tue, Nov 14, 2006 at 03:04:40PM +0800, Harry wrote:
> Err. Apologies for the one-sided conversation here. You could step back
> to the past and use a good old 22V10 (SO24 package). I didn't realise
> that they were still in use. They are just __very__ much faster these
> days :)
> 
> http://www.latticesemi.com/dynamic/view_document.cfm?document_id=120

'Course, we'd still need to learn how, and buy/make/borrow a programmer...

http://members.surfeu.de/matthias.prinke/electronics/galprog.en.htm
http://www.s-line.de/homepages/bosch/indexen.html

Maybe it's time we bought a GALEP-4 (Linux version still on it's initial
"alpha" version from August 21, 2003) or some USB equivalent:
http://www.smartcom.co.uk/menus/main.asp?QTopMenu=Programmers

Nick.

-- 
   Nick Bannon   | "I made this letter longer than usual because
nick-sig at rcpt.to | I lack the time to make it shorter." - Pascal